Morley Hum Eliminator Manual

Morley Ikke kategoriseret Hum Eliminator

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HOME THEATERS • Most modern Home Theater systems

utilize many different components hooked together via a

mixer or distribution device. These days more and more

consumer audio/video equipment has a three-prong ground-

ed plug. This creates a large potential for ground loops which

results in hum or buzz in the audio. Placing the Hum Elimina-

tor™ between offending gear will solve the noise issue. The

Hum Eliminator will even get rid of Video Hum Bars that are

caused by Ground Loop!

KEYBOARDS / SAMPLERS / SYNTHS • Most keyboards,

samplers, and synthesizers have unbalanced -10dBV

outputs. Use a Hum Eliminator™ to balance the signals if

using with other -10dBV equipment. To use a -10dBV unbal-

anced device with a +4dBu balanced device, use an

EBTECH® Line Level Shifter™.

LIVE SOUND / DJ MIXERS - A common problem with live

performance is long unbalanced cables picking up hum along

the way. Balanced signals are more immune to picking up

noise. Use the Hum Eliminator™ to balance long unbalanced

signals. Mobile DJs or bands never know when setting up

their system if they're going to get a hum or not. The electrical

wiring changes from one building to another. What works fine

at one gig might not work at the next. It's worth the low cost to

keep a Hum Eliminator™ available, nobody can afford to lose

a gig because of hum problems. Some DJs run everything in

their rig through a Hum Eliminator™ to play it safe. The main

outs on most DJ mixers are -10dBV unbalanced RCA. When

using with a +4dBu power amp, over 2/3rd's of the amp's

volume can be lost. Use an EBTECH® Line Level Shifter®.

MIXERS/RECORDING - Many mixers have either unbal-

anced or "impedance balanced" monitor outs / aux sends.

Use a Hum Eliminator™ to get true balanced monitor outs for

noise-free performance. When using more than one mixer (or

sub-mixing), there's a huge chance of getting ground loops

(and that buzz!). Use Hum Eliminators™ to prevent these

ground loops. Eliminating hum is one of the biggest challeng-

es facing studios. Many studios will run all of their line level

gear through Hum Eliminators™ to help ensure noise-free

recording.

POWER AMPLIFIERS - Running multiple amplifiers can

create ground loops between the amplifiers, which will pick up

the dreaded hum and buzz. Run each amplifier's input line

through a Hum Eliminator™ to prevent this problem.

IMPORTANT NOTE: Do not place the Hum Eliminator™

between the power amp outputs and the speakers. Doing so

will damage the power amp and/or the speakers.

COMMON USES FOR HUM ELIMINATOR™

(continued)

Hum Eliminator™ User Instructions

Silence AC Hum, forever!

Do you hear a hum or buzz in your audio signal? Are long

unbalanced lines across stage creating noise problems? Get the

Hum Eliminator™ from Ebtech®.

Almost all AC hum (60Hz in the US, 50 Hz in most other

countries), is caused by ground loops. These ground loops act

like radio antennae picking up hum and noise. The Hum Elimina-

tor™ completely eliminates this by breaking the ground loop,

making it impossible for the signal lines to pick up the AC hum and

noise in the first place.

Just plug the Hum Eliminator™ in the signal lines between the

offending pieces of equipment and you’re done! Quick and easy.

No buzz, no hum. No signal degradation. No filtering. No noise

gates. No dangerous ground lifts.

• Eliminates AC hum / 60Hz buzz and noise, quick and easy

• Breaks ground loop safely, while leaving all signal grounds intact

• Automatically translates signal voltages to match differences in

ground potentials, avoiding clipping

• Converts automatically back and forth between balanced and

unbalanced lines at either end

• Completely passive design with audiophile quality components

assures the best possible performance

• Frequency response 20Hz to 70kHz plus or minus 0.5dB

• Distortion less than 0.005% THD @ 1kHz

• Crosstalk better than –97dB

• Maximum source impedance 1kOhm. Minimum load impedance

10kOhm

• Cold Rolled Steel Housing

• One Year warranty

#M49-945171-001

WHAT WILL THE HUM ELIMINATOR™ SOLVE? The

Hum Eliminator™ is a unity gain signal and ground path

isolator designed to break ground loops. Hum and noise

caused by the presence of a ground loop can be stopped

by inserting the Hum Eliminator™ in the line level signal path

(+4dBu or -10dBV). This eliminates the ground loop without

degrading your signal. The Hum Eliminator™ will not

reduce hum or noise normally generated by a piece of

equipment. In other words, for noisy preamps, noisy

single coil pickups or noise caused by faulty tubes, other

corrective action would apply.

USING THE HUM ELIMINATOR™: First, identify the

cause of the ground loop. Note: not all ground loops cause

noise or hum. For complex systems, you may need to

repeat these steps starting with a different piece of

equipment in various combinations to locate the problem:

1) Strip the system down to one piece, by disconnecting all interconnects and

AC cords except for the mixer.

2) Add one piece of equipment at a time; hook up AC and interconnects

then listen for hum or noise.

3) Turn on and off the power each time you add equipment to avoid pops /

shorted outputs.

4) Proceed until you find the offending piece(s) causing the problem.

5) Insert the Hum Eliminator™ on all cable connection between the

offending equipment.

Note: Never use the Hum Eliminator™ between an

amplifier and speaker or you will damage your

equipment. Use only on non-powered line level

signals.

With a rack of amplifiers, we recommend putting an

eight channel Hum Eliminator™ in front of your amps

inputs so you do not have to solve ground loop problems

during sound checks. A common path for ground loops is

through a chassis into the rack and then into another

chassis. Test this by removing the chassis from the rack.

The Hum Eliminator™ will help this problem but you

should also try isolating the chassis from the rack with

electrical tape or insulating the rack screws with nylon

washers. Most ground loop problems can be solved using the

Hum Eliminator™ but patience is a necessity when

attempting to diagnose the cause of ground loop! Many

popular mixers with TRS balanced line inputs do not have

common mode rejection. They drop the inverted signal,

creating unbalanced inputs! To get the benefits of balanced

inputs, run your balanced line into the Hum Eliminator™ and

run a mono 1/4" line from the Hum Eliminator™ outputs to

the mixer's TRS inputs. This way you are running a

balanced line all the way up to the Hum Eliminator™ and

you will not lose common mode rejection.

The Hum Eliminator™ does more than just prevent AC hum

from being picked up by your sound systems. It also can be

used as one of the most cost-effective ways to convert unbal-

anced signals to truly balanced signals. On the HE-2-XLR,

you can use the 1/4” and XLR jacks in any combination.

GROUND LOOPS - The Hum Eliminator™ prevents ground

loop antennae from forming and picking up AC hum. AC hum

& noise is almost always caused by a loop antenna effect

across signal lines between two or more pieces of gear, or by

long unbalanced cables picking up noise. Loop antenna(e)

are basically a type of radio antenna, which tend to pick up

the 60Hz and harmonics (50Hz in other parts of the world)

AC signal being broadcast by a building's electrical current.

These loop antennae are closed circuits usually along the

ground wires and hence are commonly called ground loops.

BALANCED / UNBALANCED CONNECTIONS - Unbal-

anced signals are more susceptible to picking up electrical

noise & RF interference than balanced signals are. The

longer the unbalanced cable is the greater the chance of a

problem. The Hum Eliminator™ is one of the most cost-ef-

fective ways to convert between unbalanced signals and true

balanced signals.

BROADCASTING / VIDEO - Press Boxes and broadcast

studios have many feeds all going to different gear; which

can create ground loops and hum/buzz problems. Use a

Hum Eliminator™ on these feeds to eliminate the problem.

Placing a Hum Eliminator™ on the audio feed of a video

camera can help prevent video hum (snow) as well as video

hum bars that are caused by ground loops.

COMPUTER SOUND CARDS - Most sound cards have

unbalanced inputs / outputs. Balance these with the Hum

Eliminator™. Even balanced sound cards have tremendous

susceptibility to ground loops because of the computer's

power supply. If you hear a buzz, use a Hum Eliminator™.

GUITAR OR BASS - Whenever possible, we recommend you

use our Hum X product for GROUND RELATED hum issues

on a guitar or bass rig setup. If you’re in a part of the world

where the Hum X cannot be used, the Hum Eliminator™ is

the next best solution. If any of your FX pedals have a 3

prong ground power plug, you will need to put the Hum

Eliminator on the audio feed to the amp. When using two or

more guitar amplifiers (with stereo FX or ABY splitters)

ground loops can form between the amplifiers; place the

Hum Eliminator™ on the audio signal between the ABY and

the amp that is buzzing. Bass amps can get ground loop hum

from the DI connection to the PA; simply run that DI feed

through the Hum Eliminator™.

GETTING STARTED COMMON USES FOR HUM ELIMINATOR

Produkt Specifikationer

Mærke:	Morley
Kategori:	Ikke kategoriseret
Model:	Hum Eliminator

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