Crown IQ-PIP-USP2 Manual

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*PIP-USP2PIP-USP2

PIP-USP2PIP-USP2

PIP-USP2

An IQ System® Programmable Input Processor with DSP and

Load Supervision for Crown® PIP2-Compatible Amplifiers

Printed on

recycled paper.

125981-4

2/02

Telephone: 574-294-8000. Fax: 574-294-8329. Trademark Notice: IQ2, SmartAmp,

PIP, and PIP2 are trademarks, and Com-Tech, Crown, IOC, IQ System, Macro-Tech

and ODEP are registered trademarks of Crown International. Other trademarks are

the property of their respective owners.

Obtaining Other Language Versions:

To obtain information in another language about the use of this product, please

contact your local Crown Distributor. If you need assistance locating your local

distributor, please contact Crown at 574-294-8200.

Note: The information provided in this manual was

deemed accurate as of the publication date. How-

ever, updates to this information may have occurred.

To obtain the latest version of this manual, please

visit the Crown website at www.crownaudio.com.

IQ-PIP-USP2

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ILLUSTRATIONS

CONTENTS

1 Welcome ................................................... 6

1.1 Unpacking ........................................ 7

2 Controls, Connectors & Indicators ......... 8

3 Installation ................................................. 9

3.1 Prepare the IQ-PIP-USP2 ............... 9

3.2 Prepare the Amplifier .................... 10

3.3 Install the IQ-PIP-USP2 into the

Amplifier .............................................. 10

3.4 Install the Wiring .........................11

3.5 Adjust System Levels ................. 14

4 Operation ................................................ 15

4.1 Hardware & Firmware ................ 15

4.1.1 Data Signal Presence

Indicator ...................................... 15

4.1.2 Preset Indicator ............... 15

4.1.3 Crown Bus Input/

Output Connector ....................... 15

4.1.4 Crown Bus Daisy

Output Connector ....................... 16

4.1.5 Balanced Audio

Outputs ........................................ 16

4.1.6 Balanced Daisy

Outputs ........................................ 16

4.1.7 AUX Input/Output

and Listen Bus Connector ......... 16

4.1.8 Crown Bus “Drop

Out” Relays .................................16

4.2 Hardware Controls ...................... 16

4.2.1 Daisy Select

Jumpers ....................................... 16

4.2.2 IQ Address Switch

(S1) ............................................. 17

4.2.3 Scaling Switch (S3) ....... 1 7

4.2.4 Reset/Preset Switch ...... 1 7

4.3 Amplifier Control and

Monitoring ................................... 18

4.3.1 User Presets ................... 1 8

4.3.2 IOC Event Monitor .............. 18

4.3.3 Input Signal Level

Monitor ........................................ 18

4.3.4 Output Signal

Level Monitor .............................. 18

4.3.5 Thermal Headroom

Level Monitor .............................. 18

4.3.6 Power Control .................. 19

4.3.7 Signal Mute ...................... 19

4.3.8 Polarity Inverter ............... 19

4.3.9 Input Signal

Attenuator .................................... 19

4.3.10 “Ghost Faders” ..............19

4.3.11 Memory Backup ............ 19

4.3.12 Amp Information ........... 19

4.3.13 Amp Mode .....................19

4.3.14 Amp Output

Mode ............................................ 19

4.3.15 Error Reporting .............20

4.4 Signal Processing ....................... 20

4.4.1 Signal Processing

Forms ........................................... 20

4.4.2 Signal Routing ................. 21

4.4.3 Auto Standby ................... 21

4.4.4 Input Signal ...................... 21

4.4.5 Programmable

Filters ........................................... 22

4.4.6 Signal Delay .................... 24

4.4.7 Peak Voltage

Limiter.......................................... 25

4.4.8 Average Power

Limiter.......................................... 25

4.4.9 Clip Eliminator ................. 25

4.4.10 Thermal Limiter .............25

4.4.11 Output Trim

Controls ...................................... 2 6

4.4.12 Tie Switch ..................... 2 6

4.5 Load Supervision ........................... 26

5 IQ Audio In Depth ................................... 28

5.1 A Closer Look at Audio

Signal Wiring .............................. 28

5.2 A Closer Look at Crown

Bus Wiring .................................... 29

5.2.1 “Hub” Style Crown

Bus Wiring................................... 30

5.3 Using the AUX

Connector .................................... 31

5.3.1 AUX Output ......................... 31

5.3.2 AUX Input ........................... 32

5.4 Listen Bus ...................................... 33

5.5 Working with RJ-11 and

RJ-45 Connectors ......................33

5.6 Q-Factor Calculation ................... 34

5.7 Load Supervision

Applications ................................ 35

5.7.1 Typical Load

Characteristics to Know

and Understand ..........................3 6

6 Specifications ......................................... 37

7 IQ Address Tables .................................. 39

8 Using the IQ-PIP-USP2 with the

IQ-PIP-USP2 Adapter ........................ 43

9 Service ................................................. 48

Warranty ................................................. 50

Factory Service Information Form ........... 53

1.1 IQ-PIP-USP2 Front Panel ...................... 6

2.1 IQ-PIP-USP2 Controls,

Connectors and Indicators ................. 8

3.1 Address Switch (S1) .......................... 9

3.2 Scaling Switch (S3) ......................... 1 0

3.3 Scaling Chart ..................................... 10

3.4 Installing the IQ-PIP-USP2 ................... 11

3.5 Crown Bus Wiring “Loops” from Output to

Input 12

3.6 RJ-45 Mating Plug ................................ 12

3.7 RJ-45 Output to Barrier

Block Input ........................................ 12

3.8 RJ-45 Output to Din Input. .............. 1 3

3.9 RJ-45 Input to Barrier

Block Output. .................................... 1 3

3.10 RJ-45 Input to Din Output. ........... 13

3.11 RJ-45 Output to RJ-45 Input. ....... 1 4

4.1 Daisy Select Jumper Settings ........ 1 6

4.2 IQ-PIP-USP2 Signal Flow

Block Diagram ...................................... 27

5.1 Audio Input Wiring ................................ 28

5.2 Audio Output Wiring .............................. 28

5.3 Example “Hub” Style Crown Bus Wiring

Arrangement ........................................ 31

5.4 The Internal AUX Circuit ....................... 32

5.5 A Sample AUX Output Circuit ............... 32

5.6 Listen Bus Connection ......................... 33

5.7 Multi-Amp Listen Bus

Configuration ...................................... 33

5.8 RJ-11& RJ-45 Pin Assignment ....... 33

5.9 Q-factor vs. Bandwidth ..................... 34

7.1 IQ Address Switch (S1)

Settings, 0 to 83 ................................40

7.2 IQ Address Switch (S1)

Settings, 84 to 167 ............................ 41

7.3 IQ Address Switch (S1)

Settings, 168 to 250 ............................. 42

8.1 “General” Tab Showing Identification of

IQ-PIP-USP2 Adapter .......................... 45

8.2 “Signal Path” Tab Showing Peak Voltage

and Average Power Limiters Disabled . 45

8.3 “Peak Voltage Limiter” Block Disabled on

“Signal Path” Tab .................................. 46

8.4 “Average Power Limiter” Block Disabled

on “Signal Path” Tab............................. 46

8.5 “Error Reporting” Tab Showing Fault and

Load Error Reporting Disabled ............ 47

8.6 “Load Supervision” Tab Showing Load

Supervision Disabled ........................... 47

IQ-PIP-USP2

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IQ-PIP-USP2

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3 Installation

Before beginning, please carefully

note:

CAUTION: STATIC ELECTRICITY

MAY DAMAGE THE IQ-PIP-USP2

MODULE. Use caution when han-

dling the unit. Carefully ground your-

self BEFORE touching the IQ-PIP-

USP2 module. Avoid unnecessarily

touching the components or solder

pads on the circuit boards.

3.1 Prepare the IQ-PIP-

USP2

1. Set the IQ address switch S1. By

giving each IQ component a

unique address, it can be

individually controlled and

monitored. Whenever the IQ

System wants to send a command

to just one IQ component, it first

sends its address and then the

command down the Crown Bus.

S1 has eight segments because it

actually contains eight tiny

switches inside. The word “ON” is

printed on the switch along its

upper left side to indicate the ON

position and the switches are

numbered along the bottom

(Figure 3.1).

Each of the eight switches in S1

has a value which doubles as the

switch number increases. For

example switch 1 has a value of 1;

switch 2 has a value of 2; switch 3

has a value of 4; switch 4 has a

value of 8 and so on.

The address is determined by

adding the values of all “ON”

switches. In Figure 3.1, switches 1,

3, 4 and 7 are on. Simply add the

values to find the address:

1+4+8+64=77.

A convenient series of IQ address

tables are included in Section 6.

The tables show the switch

settings for all 250 addresses.

No two IQ components of the

same type which are connected to

the same Crown Bus can have the

same address.* Suppose, for

example, an IQ System has two

Crown Bus loops, 1 and 2, and this

IQ-PIP-USP2 is to be installed into

loop 1 and given an address of 77.

No other IQ PIPs can be given the

same address in loop 1. However,

an IQ PIP in loop 2 can have the

same address.

Different IQ components in the

same Crown Bus loop can have

the same address. For example,

both an IQ–USM 810 mixer/

processor and an IQ-PIP-USP2

can use address 77 in the same

loop.

Figure 3.1 Address Switch (S1)

Figure 2.1 IQ-PIP-USP2 Controls, Connectors and Indicators

2 Controls, Connectors & Indicators

* Note: All IQ PIP modules (IQ-PIP-DSP,

IQ-PIP-MEM, IQ-PIP-SMT, etc.) are

considered the same type, and so may

not share the same address on the

same Crown Bus.

IQ-PIP-USP2

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5. Remove the existing

PIP

from

the amplifier back panel (two

screws). This may involve

disconnecting the PIP from a PIP2

input adapter. If a PIP2 input

adapter is already present,

remove the ribbon cables from the

adapter.

3.3 Install the IQ-PIP-USP2

into the Amplifier

6. Carefully ground yourself to the

chassis of the amplifier before

installing the IQ-PIP-USP2. It is a

good idea to maintain ground

contact between yourself and the

amplifier while inserting the

module into the amplifier.

7. Install the IQ-PIP-USP2

into the

amplifier:

Turn the IQ-PIP-USP2 over so that

you can clearly see the two ribbon-

cable connectors located on the

underside of the circuit board (see

Figure 3.4). Connect the two input

ribbon cables of the amplifier. The

20-pin cable (A) should be

connected first, then the 18-pin

cable (B) should be connected.

Both ribbon cables should run

smoothly from the amplifier to the

PIP card (see Figure 3.4).

Important: Be careful when

attaching the ribbon cable to the

connector that the cable is

Figure 3.4 Installing the

IQ-PIP-USP2

3.2 Prepare the Amplifier

3. Turn down the level controls (full

counterclockwise) and turn off the

amplifier.

4. Disconnect the amplifier’s

power cord.

A valid IQ address is any number

from 1 to 250. Do not use a number

higher than 250 since they are

reserved for special use. An

address of “0” (zero) should only

be used for “stand alone” mode.

Setting the address switch to “0”

disables the IQ bus port.

2. Set the scaling switch S3. Input

and output scaling is adjusted via

this four-segment switch. The

word “ON” is printed on the switch

along its upper left side to indicate

the ON position and the switches

are numbered along the bottom

(Figure 3.2). Refer to the chart in

Figure 3.3 for possible scaling

combinations. The factory-default

setting is +20 dBu. Figure 3.2

shows S3 set for +20 dBu.

Figure 3.2 Scaling Switch (S3)

gnilacStuptuO/tupnI

hctiwS noitcnuF

uBd02+ uBd01+

1 tupnI1HC NO FFO

2 tupnI2HC NO FFO

3 tuptuO1HC FFO NO

4 tuptuO2HC FFO NO

Figure 3.3 Scaling Chart

properly seated before applying

pressure to the connector.

Forcing the cable onto the

connector could cause the keying

tabs, which ensure proper pin

alignment, to break. Connecting

the ribbon cables with improper

pin alignments may result in

damage to the PIP.

When both cables are firmly

attached, turn the IQ-PIP-USP2

back to an upright position and

insert into the PIP opening in the

back of the amplifier. Take care

while inserting the PIP to make

sure you do not crimp, pinch or

stretch the ribbon cables.

8. Tighten the two PIP mounting

screws until the PIP is secured to

the amplifier back panel. Be sure

to use the supplied star-

washers for good ground

connection.

9. Reconnect the amplifier to the

AC receptacle.

3.4 Install the Wiring

10. Connect the IQ-PIP-USP2

the IQ system via the Crown

Bus. The IQ components in a

Crown Bus loop are wired

sequentially. The loop begins and

ends with the IQ interface. The

output of one IQ component

“loops” to the input of the next and

so on as shown in Figure 3.5.

There are three different types of

connectors used for Crown Bus

wiring on IQ components. These

include DIN connectors, screw

terminal plugs, and RJ-45

connectors. The IQ-PIP-USP2

As an option, switches 1, 2, 3 and 4

may be all set to the ON position,

which provides +20 dBu

headroom on the input, reduces

gain in the output gain stage by 10

dB, and improves system noise

floor.

IQ-PIP-USP2

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4 Operation

With an IQ-PIP-USP2 module,

your Crown amplifier can be moni-

tored and controlled from a remote

location through the use of an IQ

System. This PIP module features

SmartAmp

™ capabilities which will

enable the amplifier to function au-

tomatically. For example, the IQ-PIP-

USP2 can automatically turn off the

high voltage supplies of the amplifier

when no input signal is present. This

can lower electrical usage and pro-

vide long-term cost savings. The IQ-

PIP-USP2 can also automatically

limit the audio signal and detect and

report various problems.

The IQ-PIP-USP2 also features digi-

tal signal processing capabilities

including signal delays and a wide

variety of filters.

In addition, the IQ-PIP-USP2

Load Supervision feature has the

ability to verify the status of the loads

in real time.

The IQ-PIP-USP2 uses Crown’s IQ2

protocol. This makes it possible for a

user to design custom graphic dis-

play modules to control and monitor

the unit with IQ2-compatible IQ soft-

ware. This allows even greater flex-

ibility within Crown’s IQ software via

custom control pages. Plus, the IQ2

protocol provides for third-party pro-

gramming for system controllers

such as those from AMX and

Crestron.

The following sections describe the

IQ-PIP-USP2 features and opera-

tion. Where specified, some features

are accessed via controls located

on the unit itself. However, many of

the features can be controlled or

configured using IQ for Windows soft-

ware. Commands are transmitted

via an IQ interface to the specified IQ

component (an IQ2-compatible in-

terface is required). Please contact

your Crown representative or

Crown’s Technical Support Group if

you are unfamiliar with IQ software.

4.1 Hardware

4.1.1 Data Signal Presence

Indicator

An amber Data Signal Presence In-

dicator (DATA) is provided on the

front panel. It flashes whenever com-

mands addressed to the IQ-PIP-

USP2 are received. To assist with

troubleshooting, an option that

forces the DATA indicator to remain

lit is available through IQ software.

4.1.2 Preset Indicator

A green PRESET indicator is pro-

vided on the front panel. This indica-

tor signals the number of the cur-

rently selected preset by emitting a

series of flashes which match the

preset number, followed by a pause.

The indicator will continuously re-

peat the number selected until a

change is made to any setting.

4.1.3 Crown Bus Input/Output

Connector

An RJ-45 connector provides both

input and output connection to the

Crown Bus. This connector is used

for input in a conventional Crown

Bus wiring configuration, and can

be used for both input and output

when a “hub” style Crown Bus wir-

ing configuration is implemented

(see Section 5.2). Drop-out relays

maintain loop integrity in the event

power is removed from the IQ-PIP-

11. Connect the audio signal

wiring to the IQ-PIP-USP2. Two

female XLR connectors, one for

each channel, are provided for

signal input. Two male XLR

connectors, one for each channel,

are provided for audio daisy

chaining. See Section 5.1 for more

information on audio wiring.

Figure 3.11 RJ-45 Output to RJ-45 Input.

12. Reconnect amplifier to the AC

receptacle.

3.5 Adjust System Levels

13. Adjust attenuator levels both on

the amplifier and on the IQ-PIP-

USP2 control panels within your IQ

software for optimum system gain.

IQ-PIP-USP2

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An 8-section DIP switch is used to

set the IQ address of the unit. A valid

IQ address is any number from 1 to

250. Numbers higher than 250 are

reserved for special use. An ad-

dress of “0” places the unit in stand-

alone mode. In this mode, the IQ

bus port is disabled and the PIP will

not function with IQ software.

This switch is located on the under-

side of the circuit board. Each IQ

component on a Crown Bus is given

a unique IQ address so it can be

independently controlled and moni-

tored. Two or more IQ components

of the same type should NEVER have

the same address on the same

Crown Bus loop.

For information on setting the IQ

Address Switch, see Section 3.1.

4.2.3 Scaling Switch (S3)

A 4-section DIP switch is used to set

the input and output scaling. This

switch is located on the under-side

of the circuit board. The factory-

default setting is +20dBu.

For information on setting input

and output scaling, see Section 3.1.

4.2.4 Reset/Preset Switch

A recessed reset/preset switch, ac-

cessible from outside the PIP panel,

performs two functions. First, it en-

ables the IQ-PIP-USP2 to be re-

stored to factory default settings,

and second, allows the user to re-

call any of ten presets. A straight-

ened paper clip or similar small ob-

ject is required to press the reset

switch.

To select one of the ten presets,

complete the following steps:

Remove all input signals. With the

power on, briefly press the switch for

less than two seconds to toggle

through the 10 user-defined presets

stored in firmware. Each press will

increment the selected preset by

one. After the switch is released, the

DATA light will flash rapidly for a

moment, then the PRESET indicator

will blink to indicate the preset num-

ber selected. Restore input signals.

To restore the unit to the factory

default settings, complete the fol-

lowing steps:

Remove all input signals. With the

power on, press the switch and hold

for more than 2 seconds, or until the

DATA indicator blinks twice, and all

settings will be reset to factory de-

fault. When the switch is released,

the DATA indicator will flash rapidly

for a moment. Restore input signals.

To clear all memory and set to

factory default presets:

Important: This action will re-write

the flash memory and erase stored

presets. The settings will be reset

to factory default, with the firmware

re-writing to flash memory.

Remove all input signals. Apply

power. Press and hold the switch.

The Data and Preset lights will si-

multaneously flash. After 7 flashes,

release the switch when the lights

are on. Lights will flash back and

forth, then data light will flash by

itself. If this does not occur, repeat

the process.

After the unit has been reset to the

factory default settings, it will behave

like a standard PIP until it is repro-

grammed by an IQ System. Restore

input signals.

USP2.

4.1.4 Crown Bus Daisy Output

Connector

An RJ-45 connector is provided for

normal daisy wiring output to the

next device on the loop in the Crown

Bus.

4.1.5 Balanced Audio Inputs

A female XLR connector is provided

for balanced audio input to each

channel of the amplifier. Do not use

the Ch.2 input if the amplifier is

configured in either Bridge or Par-

allel-Mono mode.

4.1.6 Balanced Daisy Outputs

A male XLR connector is provided

for balanced audio daisy chaining

for each channel. Each daisy output

connector can be set to pass pro-

cessed or unprocessed signal from

its respective channel via jumper

settings.

4.1.7 AUX Input/Output and

Listen Bus Connector

An RJ-11 connector provides three

functions. The AUX output delivers

15 VDC at 10 mA maximum output

when switched on and may be con-

trolled via software or may be pro-

grammed to switch when a fail con-

dition is present on any channel.*

The high-impedance (10 K ohm) AUX

input can sense logic signals and

can be programmed to activate sys-

tem mute or report fault conditions

when a logic high is present. (See

Section 5.3.2 for more information.)

Either amplifier channel’s output can

be monitored as a balanced line

level signal which is sent to pins 1

and 6 of the RJ-11 connector (soft-

ware selectable).

4.1.8 Crown Bus “Drop Out”

Relays

“Drop out” relays are provided on

the Crown Bus ports to maintain the

continuity of the IQ communication

loop even if the IQ-PIP-USP2

loses power.

4.2 Hardware Controls

The following IQ-PIP-USP2 controls

are accessed via hardware switches

located on the unit:

4.2.1 Daisy Select Jumpers

Jumpers select through or pro-

cessed signal daisy routing to the

Channel 1 and Channel 2 daisy XLR

connectors. The Channel 1 daisy

connector can be set for through

(IN) or processed (OUT) signal from

Channel 1, and the Channel 2 daisy

connector can be set for through

(IN) or processed (OUT) signal from

Channel 2. See Figure 4.1.

4.2.2 IQ Address Switch (S1)

* The AUX output uses inverse logic

when it is configured to report a fail

condition. Normally high, it switches

low when any channel fails a test. In this

way it can also indicate a power loss.

DSY1

DSY2

OUT IN

Figure 4.1 Daisy Select Jumper

settings for through routing for both

Channel 1 and Channel 2 signals.

IQ-PIP-USP2

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Each channel’s high-voltage supply

can be independently turned on and

off.

4.3.7 Signal Mute

The output signal of each channel

can be independently muted. This

function typically provides 80 dB or

more of attenuation.

IMPORTANT: The daisy chain out-

puts are also muted by activation of

this function if selected for “pro-

cessed” out.

4.3.8 Polarity Inverter

The polarity of the input signal of

each channel can be independently

inverted.

4.3.9 Input Signal Attenuator

An attenuator at the input of each

channel is used to control the input

signal level. Each attenuator has a

range from 0 dB to –80 dB in ½ dB

steps. (Zero equals no attenuation.)

4.3.10 “Ghost Faders”

These indicators let you monitor the

signal path gain where it may differ

from manual gain set on input at-

tenuation and output trim as the re-

sult of limiting or compression. They

appear as flying faders “behind” the

input attenuators.

4.3.11 Memory Backup

A memory backup feature is pro-

vided which can be disabled, if de-

sired. The factory default setting is

“enabled.” When enabled, the

memory backup stores all run-time

parameters that can be controlled

by the IQ software into nonvolatile

flash memory. Memory backup oc-

curs within 2 seconds after any pa-

rameter change. When disabled, all

run-time parameters are returned to

the last backed-up values whenever

the unit loses power.

CAUTION: Care should be taken to

backup “safe” levels for the input

attenuators and output trim controls.

Changes made after disabling

backup are not saved; therefore, it is

possible for the memory backup fea-

ture to be turned off with “unsafe”

levels stored. This may result in sig-

nificantly greater system gain the

next time power is re-applied to the

IQ-PIP-USP2.

4.3.12 Amp Information

Several useful items of information

about the host amplifier are deter-

mined by the IQ-PIP-USP2 at start-

up. These include manufacturer,

model, date code, serial number,

and revision level. These can be

printed from the system inventory.

4.3.13 Amp Mode

The Stereo (Dual), Bridge-Mono or

Parallel-Mono mode of the amplifier

can be stored in the IQ-PIP-USP2’s

memory so the IQ System is aware

of the position of the amplifier’s out-

put mode switch. Storing this setting

serves as an “electronic reminder” to

the system; however, the actual

mode of the amplifier cannot be con-

trolled with this setting. The software

amp mode setting can be displayed

or modified via IQ for Windows soft-

ware.

4.3.14 Amp Output Mode

On Com-Tech series amplifiers, the

output mode of the amplifier can be

stored in the IQ-PIP-USP2’s memory

so the IQ System is aware of the

amplifier’s output mode setting. This

software switch also scales the out-

4.3 Amplifier Control and

Monitoring

The following IQ-PIP-USP2 features

are accessed via IQ for Windows

software.

4.3.1 User Presets

The parameters for all functions can

be saved as presets. A total of ten

user presets can be stored in the IQ-

PIP-USP2’s flash memory. Preset

names are stored on the PIP

4.3.2 IOC Event Monitor

The Input/Output Comparator (

IOC

®)

of each channel of the amplifier can

be monitored by the IQ System. The

IOC circuitry acts as a sensitive dis-

tortion meter to provide you

proof of

distortion-free performance

. If dis-

tortion of any kind equals or exceeds

0.05%, the IOC circuit will cause an

IOC Event Monitor on the front of the

amplifier to flash. The IQ-PIP-USP2

can cause a warning to flash on your

computer screen via IQ for Windows

software indicating an IOC event,

Also, it can report IOC events to it’s

AUX port.

4.3.3 Input Signal Level Monitor

The input signal level of each chan-

nel can be monitored. This monitor

feature has a range from +20 dBu to

–40 dBu in ½-dB steps.

4.3.4 Output Signal Level

Monitor

The output signal level of each chan-

nel of the amplifier can be moni-

tored. This monitor feature has a

range from 0 dB to –40 dB where 0

dB is referenced to the rated output

voltage of the amplifier model.*

The IQ-PIP-USP2 features scaled

output level meters. By factory de-

fault, the meters are calibrated such

that 0 dB equals the amplifier’s rated

output into 4 or 8 ohms. If the IQ-PIP-

USP2 is installed into a Com-Tech®

amplifier, the meters default to 0 dB

equals 70 Vrms. Changing the 4/8 -

70V mode software switch selects

the respective scaling.

4.3.5 Thermal Headroom Level

Monitor

The Thermal Headroom level** of

each channel of the amplifier can be

monitored by the IQ software. This

level represents the percent of avail-

able power/thermal capacity that is

currently being used within the out-

put section of the amplifier. When

the thermal headroom level reaches

100%, the amplifier cannot produce

any more power and it will begin to

limit the drive level to the output

devices to protect them from too

much stress.*** The Thermal Limiter

feature of the IQ-PIP-USP2 can be

set to engage upon a pre-selected

thermal level. (See Section 4.3.15)

4.3.6 Power/Standby Control

* This is assumed to be 70V or the rated

8-ohm output for Com-Tech amplifiers

or the rated 8-ohm output voltage for all

other amplifiers.

** Thermal Headroom on your Crown am-

plifier may be labeled Output Device

Emulation Protection (ODEP)

*** See the amplifier’s

Reference

Owner’s Manual

for more information

about ODEP and how it works.

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

Figure 4.2 IQ-PIP-USP2 Signal Flow Block Diagram

dB in ½-dB steps.

4.4.11 Output Trim Controls

An output trim control is provided for

each channel to adjust the output

gain after processing, allowing for

“make-up” gain to compensate for

losses due to crossovers, etc. Range

is +12 dB to –80 dB in ½-dB steps.

4.4.12 Tie Switch

The Tie switch connects all active

compressors and limiters together

so that any limiting/compression af-

fects the signal on both channels,

such as would typically be desired

when processing stereo signals.

4.5 Load Supervision

The Load Supervision feature allows

real time monitoring of the load con-

nected to each amplifier channel.

When enabled, the IQ-PIP-USP2

continuously monitors the amplifier

output voltage and current and cal-

culates the long-term average load

impedance. The measured load im-

pedance is compared against user

defined high and low limits. If either

limit is exceeded, the status indica-

tor and/or IQ System error reporting

functions alert the user of the prob-

lem. There are six controls and two

indicators for each channel:

On/off: Turns the Load Supervision

feature on or off.

High Limit: Sets the upper bound

above which the system will report a

“high” error status.

Low Limit: Sets the lower bound

below which the system will report a

“low” error status.

Nominal Load Impedance: Sets the

expected average impedance for

the connected load. This value de-

termines the output signal level re-

quired for test. This parameter is

also used by the average power lim-

iter to determine the expected power

limit threshold. See Section 4.4.8

Calculate: This button invokes an

impedance calculator. Entering out-

put voltage and power will give the

expected impedance.

Include in Standard Error Report-

ing: Enables error reporting so that

any high/low status condition is re-

ported via the IQ System (See Sec-

tion 4.3.15).

Report to Aux: Enables any high/

low status condition to be reported

via the IQ-PIP-USP2 aux port output

(See Section 4.1.7).

Test Indicator: This indicator lights

when the load supervision algorithm

is actually performing a load imped-

ance calculation and test verifica-

tion.

Low/Normal/High Indicator: This

indicator shows the present status

of the load with respect to the user

defined high/low limits.

Z avg Monitor: Reports actual cal-

culated average load impedance.

IQ-PIP-USP2

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IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

• The same IQ address can be used

more than once (once per loop per

model).

Single Loop Advantages

(with IQ-INT II interfaces)

• The IQ System can send and

retrieve data faster in a single loop.

• “Real time” level display of a

greater number of units is

possible.

The IQ-PIP-USP2 can be connected

to the Crown Bus with inexpensive

twisted-pair wiring (shielded or

unshielded). If fiber optic wiring is

required contact the Crown Techni-

cal Support Group (see page 2).

Here are some guidelines for twisted-

pair wiring:

•Use shielded twisted-pair wire at

least 26 AWG in size when

interference is a problem. The wire

should be of good quality and

should have low capacitance—30

picofarads/foot or less is good.

(West Penn 452 or an equivalent

wire works well.) The shield serves

two purposes: First, it helps

5.2 A Closer Look at

Crown Bus Wiring

The IQ-PIP-USP2 must be con-

nected to a Crown Bus loop having

an IQ2-compatible IQ interface in

order for the IQ System to control or

monitor it. The Crown Bus is a serial

communication loop designed to

transmit IQ commands and data. As

implemented in the IQ-PIP-USP2, it

is a 20 milliamp current loop operat-

ing at a BAUD rate of 38.4 K. The

loop must be unbroken to function

properly.

If the system includes an IQ–INT II

interface, it can accept eight differ-

ent Crown Bus loops or zones. Di-

viding the sound system into differ-

ent zones, each with its own Crown

Bus loop, can have several advan-

tages. The following list contrasts

those advantages with those of a

single loop.

Multiloop Advantages

• A break in communication in one

loop does not affect other loops.

• Over 250 IQ components of the

same type can be used in a

system.

5 IQ Audio In Depth

This section provides additional in-

formation about Crown’s IQ System

with special guides to aid in the

• When using unbalanced lines,

keep the cables as short as

possible. Avoid lengths greater

than 10 feet (3 meters).

• Do not run audio input cables

together with high-level wiring

such as loudspeaker wires or AC

cords. (This lessens the chance of

hum or noise being induced into

the input cables.)

• Do not connect audio and data

grounds together. For example,

do not connect the audio ground to

the Crown Bus ground.

installation and use of the IQ-PIP-

USP2. For more information about

any of these topics, contact Crown

Technical Support.

5.1 A Closer Look at Audio

Signal Wiring

Balanced XLR connectors are pro-

vided for audio input connection.

The audio cables should be wired in

one of the following manners (see

Figure 5.1):

We strongly recommend that bal-

anced wiring be used if possible.

Some important guidelines follow:

• Always use shielded wire. The

higher the density of the shield

(the outer conductor), the better.

Spiral wrapped shield is not

recommended.

INPUT

INPUT OUTPUT OUTPUT

Figure 5.2 Audio Output Wiring

Figure 5.1 Audio Input Wiring

• Turn the entire sound system off

before changing any connections.

Turn the level controls down

before powering the system back

up. Crown is not liable for damage

incurred when any transducer or

component is over-driven.

Balanced XLR connectors are pro-

vided for “daisy chain” audio con-

nection. The audio cables should be

wired in one of the following man-

ners (See Figure 5.2):

DO NOT USE THE CHANNEL 2

INPUT if the amplifier is used in

either Bridge-Mono or Parallel-Mono

mode.

For additional information on audio

input connection please refer to the

amplifier’s

Reference

Owner’s

Manual

. It contains helpful informa-

tion on preventing unwanted sub-

sonic frequencies, radio frequency

interference, ground loops, and

feedback oscillation.

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

Figure 5.3 Example of “Hub” Style Crown Bus Wiring Arrangement

* Separate shielded pairs may be re-

quired for long runs.

* Because typical mic cables have high

capacitance, the maximum possible

Crown Bus loop distance will be less.

prevent the IQ data signal from

transmitting to nearby audio

wiring. Second, it helps prevent

outside RF from interfering with the

data signal. However, in most

cases interference is not a

problem and, since unshielded

wire has lower capacitance, it is a

better choice.

•Minimize the total capacitance

of each Crown Bus loop. The

total capacitance should be less

than 30 nanofarads. Allow for

approximately 60 picofarads for

each IQ component in a loop. This

accounts for a slight delay which

occurs as data signals pass

through a component.

•Add an IQ Repeater for very long

loops—greater than 1,000 feet

(305 m)—or when required by

high-capacitance wire. Although

we recommend a repeater for

loops longer than 1,000 feet, it is

often possible to go 2,000 feet

(610 m) or more. The most

significant characteristic of the

wire is its capacitance. Lower

capacitance allows longer loops.

Unshielded wire usually has less

capacitance.

•Never use the ground wire in a

mic snake line. It may sometimes

be convenient to run Crown Bus

data signals to and from stage

monitor amplifiers along unused

wire pairs in a mic snake. Do not

use the ground wire which is

normally connected to pin 1 on an

XLR connector or data noise will

be added to the audio lines. Use

only the signal lines which

normally connect to pins 2 and 3 of

the XLRs.*

Outside RF interference is seldom a

problem for a Crown Bus loop—

especially if shielded twisted-pair

wire is used. However, there are

extreme situations when fiber optic

wiring is recommended. For ex-

ample, locating a Crown Bus loop

next to an AM radio transmission

line may require fiber optic cabling.

An extremely long Crown Bus loop

distance may also require fiber op-

tic cabling.

5.2.1 “Hub” Style Crown Bus

Wiring

The Crown Bus can be wired using

a “hub” arrangement, making addi-

tion and removal of IQ components

in the field easier and faster with less

chance of loosing loop integrity. As

in a conventional loop arrangement,

the Crown Bus is wired in a serial

loop, but all IQ components on the

loop are connected at a central patch

panel (see Figure 5.3). Typically Cat5

RJ-45 style patch panels are imple-

mented, and allow the use of off-

the-shelf pass-through network

cable for connecting the IQ-PIP-

USP2 to the patch panel.* The com-

bination input/output Crown Bus con-

nector on the IQ-PIP-USP2 has been

designed specifically for this use.

When wiring the Crown Bus in a hub

arrangement, all unused ports on

the patch panel must be terminated

with shorting plugs to close the loop.

For more information about wiring

the Crown Bus in a hub arrange-

ment, contact Crown Technical

Support.

5.3 Using the AUX

Connector

The IQ System offers tremendous

flexibility and the auxiliary feature

connector provides a means of tap-

ping into it. It can be used to turn

peripherals on/off, send a signal to

another system component, receive

a signal from another component,

and send a line level audio signal of

amplifier’s output.

The AUX connector is an RJ-11 type.

Pins 2 and 5 are used to receive a

signal and pins 3 and 4 are used to

send a signal

5.3.1 AUX Output

When the auxiliary feature is turned

on by the IQ for Windows software

+15 VDC is supplied across pins 3

(ground) and 4 (+). A total of 10

milliamps of current is available. A

1.5 K ohm resistor protects against

shorts (See Figure 5.4).

There are many possible uses for

the AUX output. For example, it can

be used to turn on auxiliary cooling

fans. To do this the AUX connector

might be used to close a relay.* The

* A suitable solid-state relay for use in

such a circuit is available from Crown

(CPN D8063-6). Contact your local

Crown representative or the Crown

Factory Parts Department (219-294-

8200) to order.

DIN

OUT

SHORTING

PLUG FOR

UNUSED

PORTS

OUT

INT II

CAT. 5 PATCH PANEL

USP2 SLM-8 USM 810

STANDARD

THRU-TYPE

NETWORK

CABLE

(CAT.5)

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

IQ-PIP-USP2

Page 32

IQ-PIP-USP2 Reference Manual

* A negative signal can also be used as a

logic low because the signal is inter-

nally clamped to protect the internal

circuitry.

relay would then turn the fans on or

off. This is shown in Figure 5.5.

By monitoring the operating condi-

tion of amplifiers with the IQ System

software, the need for additional

cooling would be apparent. The

same software could then be used

to turn on the appropriate AUX con-

nector. (For more information about

turning the auxiliary feature on/off,

consult the IQ for Windows software

documentation.)

5.3.2 AUX Input

Depending on the IQ software being

used, the AUX connector can be

used to sense the presence of an

input signal across pins 2 (+) and 5

(ground). A +5 to +15 VDC signal at

the input will be interpreted as a

logic “high” and will be communi-

cated to the Crown Bus where a host

Figure 5.4 The Internal AUX Circuit

Figure 5.6 Listen Bus Connection

Figure 5.5

A Sample AUX Output Circuit

5.4 Listen Bus

Use the diagram in Figure 5.6 to

connect an audio monitoring sys-

tem, such as a headphone preamp,

to the IQ-PIP-USP2 Listen Bus.

computer or controller can act upon

it. A signal less than +1.6 VDC is

interpreted as a logic “low.”*

5.5 Working with RJ-11

and RJ-45 Connectors

Pin assignments for standard RJ-11

and RJ-45 connectors are indicated

in Figure 5.8.

Amp 1

Amp 2

Figure 5.7 demonstrates how mul-

tiple amplifiers can be monitored

using the Listen Bus. Crown’s IQ for

Windows software allows you to se-

lect the amplifier and channel you

wish to monitor.

Figure 5.7 Multiple -Amp Listen

Bus Configuration

When wiring RJ-45 connectors, it is

good practice to follow the EIA/TIA

568B protocol for RJ-45 connector

cable. This protocol assigns wire

colors as follows:

1 white-orange 5 white-blue

2 orange-white 6 green-white

3 white-green 7 white-brown

4 blue-white 8 brown-white

Extra care must be taken when at-

taching RJ-11 and RJ-45 connec-

tors to cable. Make sure you use the

appropriate crimping tool and verify

that the connector is properly seated

into the tool, or damage will result.

Contact Crown Technical Support

for additional information about work-

ing with RJ-11 and RJ-45 connec-

tors.

When wiring RJ-11 connectors, it is

good practice to follow the USOC

protocol for RJ-11 connector cable.

This protocol assigns wire colors as

follows:

1 white-green 4 white-blue

2 white-orange 5 orange-white

3 blue-white 6 green-white

RJ-11 RJ-45

Figure 5.8 RJ-11 & RJ-45 Pin

Assignments

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

6 Specifications

General

Internal Controls: An 8-segment

DIP switch sets the IQ address (deci-

mal range: 1–250).* A 4-segment

DIP switch sets input and output

scaling. A Reset/Preset switch, ac-

cessible with a straightened paper

clip through the PIP panel, selects

the next user preset if pressed for

less than 2 seconds, resets settings

to “factory default ” if it is pressed

for more than 2 seconds, or re-writes

from firmware to flash memory re-

storing all settings to factory default

if it is pressed while applying power.

Jumpers select thru or processed

signal for daisy output of each chan-

nel.

Connectors: Crown Bus: RJ-45 con-

nector for input/output, RJ-45 con-

nector for daisy output. AUX In/Aux

Out/Listen Bus: RJ-11 connector.

Audio Input: Balanced 3-pin female

XLR connector for each channel.

Audio “Daisy Chain” Output: Bal-

anced 3-pin male XLR connector for

each channel.

Indicators: A yellow DATA indicator

flashes when a valid IQ command is

received from the IQ System via the

Crown Bus. The DATA indicator can

be forced on to facilitate rapid

troubleshooting of Crown Bus wir-

ing. A green PRESET indicator

flashes to indicate the user preset

number currently selected in

memory. If the PRESET indicator does

not flash the preset number when

* If address “0” is selected, the IQ-PIP-

USP2 will operate in stand-alone mode.

In this mode, the Crown bus port is de-

activated.

The following example calculates the

SPL necessary for supervision of a

typical 8-ohm system. While the re-

sulting 80-dB SPL @ 1 meter is

definitely above conversation level,

it is not uncomfortable.

An “8 ohm” example:

30 mA into 8 ohms = 0.007watts

8-ohm driver sensitivity = 100dB for

1W @ 1 meter

0.007W/1W = –20dB

Required SPL for supervision test is

100dB – 20dB = 80dB SPL @ 1

meter

5.7.1 Typical Load

Characteristics to Know and

Understand

It is well known that the typical loud-

speaker impedance is not the same

for all frequencies. This variance is

due to the effect of electrical proper-

ties such as the expected increase

in impedance at high frequencies

selected, this indicates the preset has

been modified by the user.

Memory Backup: 1 Mbyte non-vola-

tile FLASH memory for backup of

run-time parameters, presets, and

program storage. Capable of 80,000

writes minimum.

Power Requirements: Power draw:

240 mA @ +24 VDC and 65 mA @

–24 VDC. When installed into a

Crown PIP-compatible amplifier, the

unit receives ±24 VDC from the am-

plifier. No external power is required.

Total Power Dissipation: 7.4 watts.

Crown Bus Data

Communication

Protection: If communication is lost,

the unit will continue to function with

the last commands received.

Data Rate: 38.4 K BAUD.

Data Format: Serial, binary, asyn-

chronous; 1 start bit; 1 stop bit; 8

data bits; no parity.

Crown Bus Interface Type: Opti-

cally isolated 20 milliamp serial loop.

Operation: Half duplex.

Transmission Distance: Variable

from 200 to 3000 feet (61 to 914 m),

depending upon wire capacitance.

Typically 1000 feet (305 M) using

shielded twisted-pair wire, #26 AWG

or larger. Can be extended with an

IQ Repeater.

due to driver voice-coil inductance,

or the peaks and valleys due to

passive crossovers. Testing of vari-

ous passive boxes has shown peaks

of 100 ohms or more! Low frequency

impedance variation can come from

the interaction of the driver compli-

ance with that of the box. The low

frequency variations are usually wide

bandwidth and may vary from 6 to

30 ohms on an 8-ohm driver.

These anomalies are easily aver-

aged out by the IQ-PIP-USP2 super-

vision algorithm in most systems.

However, there may be some ex-

treme situations for very narrow

bandwidth (i.e. single-note) signals

and/or very widely varying loads that

the algorithm simply cannot over-

come. In these cases, widening the

high and low limits will help de-

crease the “sensitivity” of supervi-

sion and decrease chance of “nui-

sance” error reports.

IQ-PIP-USP2

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IQ-PIP-USP2 Reference Manual

IQ-PIP-USP2

Page 40

IQ-PIP-USP2 Reference Manual

Figure 7.2 IQ Address Switch (S1) Settings from 84 through 167

Figure 7.1 IQ Address Switch (S1) Settings from 0 through 83

Produkt Specifikationer

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