Instrukcja obsługi Morley Hum Eliminator

Morley nieskategoryzowany 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

Specyfikacje produktu

Marka: Morley
Kategoria: nieskategoryzowany
Model: Hum Eliminator

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