Nady Systems Stereo System GEQ131 User Manual

GEQ Series  
Graphic Equalizers  
Owner’s Manual  
250  
1.6K  
2K 2.5K  
3.15K 4K  
10K  
12.5K 16K 20K  
32  
40  
50  
63  
80  
100  
125  
200  
315  
400  
500  
630  
800  
1K  
1.25K  
5K  
6.3K  
8K  
25  
160  
20  
LOW  
CUT  
POWER  
EQ  
+12  
+6  
+3  
0
+12  
+6  
+3  
0
+12  
+6  
+3  
0
+20  
+13  
0
ON  
OFF  
GEQ 131  
GRAPHIC EQUALIZER  
31 BAND  
-3  
-3  
-3  
-6  
-5  
-6  
-6  
-12  
-12  
-12  
GAIN  
25  
40  
63  
100  
160  
250  
400  
630  
1K  
1.6K  
2.5K  
4K  
6.3K  
10K  
16K  
25  
40  
63  
100  
160  
250  
400  
630  
1K  
1.6K  
2.5K  
4K  
6.3K  
10K  
16K  
CH  
CH  
1
2
+12  
+12  
+12  
+12  
+20  
+20  
+13  
0
+6  
+3  
0
+6  
+3  
0
+6  
+3  
0
+6  
+3  
0
0
0
+13  
0
GEQ 215  
GRAPHIC EQUALIZER  
DUAL 15 BAND  
-3  
-3  
-3  
-3  
-5  
-5  
-6  
-6  
-6  
-6  
-12  
-12  
-12  
-12  
dB  
dB  
ON  
ON  
OFF  
-12  
+12  
-12  
+12  
OFF  
 
Warning  
1. Read.all.instructions.before.using.the.product..  
ꢀ. Do.not.use.this.product.near.water.(e.g.,.near.a.bathtub,.  
washbowl,.kitchen.sink,.in.a.wet.basement,.or.near.a.  
swimming.pool,.etc.)..  
the.outlet’s.or.extension.cord’s.power.rating.is.exceeded,.  
and.(3).never.be.left.plugged.into.the.outlet.when.not.being.  
used.for.a.long.period.of.time..  
9. Care.should.be.taken.so.that.objects.do.not.fall.into,.and.  
liquids.are.not.spilled.through,.the.enclosure’s.openings..  
10. The product should be serviced by qualified service  
personnel.if:.  
3. This.product.should.be.used.only.with.a.cart.or.stand.that.  
will.keep.it.level.and.stable.and.prevent.wobbling..  
4. This.product,.in.combination.with.headphones.or.speakers,.  
may.be.capable.of.producing.sound.levels.that.could.  
cause.permanent.hearing.loss..Do.not.operate.for.a.long.  
period.of.time.at.a.high.volume.level.or.at.a.level.that.is.  
uncomfortable..If.you.experience.any.hearing.loss.or.ringing.  
in.the.ears,.you.should.consult.an.audiologist..  
A..The.power.supply.cord.or.the.plug.has.been.damaged..  
B..Objects.have.fallen.into,.or.liquid.has.been.spilled.onto.  
the.product..  
C..The.product.has.been.exposed.to.rain..  
D..The.product.does.not.appear.to.operate.normally.or.  
exhibits.a.marked.change.in.performance..  
5. The.product.should.be.positioned.so.that.proper.ventilation.is.  
maintained..6..  
E..The.product.has.been.dropped,.or.the.enclosure.  
damaged..  
6. The.product.should.be.located.away.from.heat.sources.  
such.as.radiators,.heat.vents,.or.other.devices.(including.  
amplifiers) that produce heat.  
11. Do.not.attempt.to.service.the.product.beyond.what.is.  
described.in.the.user.maintenance.instructions..All.other.  
servicing should be referred to qualified service personnel.  
7. The.product.should.be.connected.to.a.power.supply.only.  
of.the.type.described.in.the.operating.instructions.or.as.  
marked.on.the.product..Replace.the.fuse.only.with.one.of.the.  
specified type, size, and correct rating.  
8. The.power.supply.cord.should:.(1).be.undamaged,.(2).never.  
share.an.outlet.or.extension.cord.with.other.devices.so.that.  
An equilateral triangle enclosing a lightning flash/arrowhead symbol  
is intended to alert the user to the presence of uninsulated  
“dangerous voltage” within the product’s enclosure which may be of  
sufficient magnitude to constitute a risk of electric shock.  
ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR  
An equilateral triangle enclosing an exclamation point is intended to  
alert the user to the presence of important operating and service  
instructions in the literature enclosed with this unit.  
Date.of.Purchase.  
City.  
Dealer’s.Name  
.
.
State.  
Zip  
Model.#.  
Serial.#  
3
 
Installation  
INSTALLATION  
power.source..  
To.ensure.years.of.enjoyment.from.your.NADY.AUDIO.graphic.  
equalizer,.please.read.and.understand.this.manual.thoroughly.  
before.using.the.unit..  
If.water.is.spilled.on.or.in.the.unit,.unplug.it.and.call.for.  
service..  
Make.sure.that.the.equipment.is.well.ventilated.and.away.  
from.direct.sunlight.  
These.three.equalizer.models.are.each.designed.for.mounting.in.  
a.standard.19”.equipment.rack.or.one.of.the.many.rack.type.por-  
table.cases.available.on.the.market..The.units.are.either.1u.single.  
rack.(1.75”).or.2u.double.rack.(3.5”).as.noted..All.three.models.  
are.5.inches.deep..  
Avoid.damage.to.the.internal.circuits.and.the.external.  
surface.by.keeping.the.unit.away.from.sources.of.high.heat..  
Avoid.using.spray.type.insecticide.or.solvents.near.the.  
equipment. It can damage the finish an might ignite suddenly  
To avoid damaging the finish, never use denatured alcohol,  
paint.thinner.or.other.similar.chemicals.to.clean.the.  
equipment..  
Install.the.equalizer.in.a.rack.with.rack.screws.(not.included)..  
Route.the.A.C..power.cord.to.a.convenient.power.outlet.away.  
from.audio.lines..The.unit.may.be.turned.on.and.off.from.the.front.  
panel.power.switch.or.a.master.equipment.power.switch..Since.  
the.unit.draws.a.relatively.small.amount.of.current.during.idle,.the.  
unit.may.be.left.on.continuously..NADY.AUDIO.equalizers.do.not.  
generate.an.unduly.large.amount.of.heat.and.do.not.need.to.be.  
specially.ventilated.or.cooled..The.units.should.not.be.subjected,.  
however,.to.high.heat.environments..  
Place the unit on a flat and solid surface or in a rack.  
To.enjoy.your.NADY.AUDIO.graphic.equalizer.for.a.long.  
time,.please.read.this.owner’s.manual.thoroughly..  
Although.the.unit.is.shielded.against.radio.frequency.(RF).and.  
electromagnetic.interference.(EMI),.extremely.high.fields.of.RF.  
and.EMI.should.be.avoided..  
Paralleling.inputs.and.outputs.may.be.accomplished.by.using.any.  
of.the.2.connectors..  
POWER CONNECTION  
Each.of.these.three.NADY.AUDIO.graphic.equalizers.is.designed.  
for operation with 105-130 volts AC at 60Hz power sources .  
Power.requirements.for.electrical.equipment.differ.from.area.to.  
area..In.new.installations.and.portable.sound.systems,.or.any.  
situation.in.which.the.AC.power.is.in.question,.it.is.wise.to.confirm.  
the.voltage.before.connecting.the.instrument.to.power.sources..  
PRECAUTIONS  
Protecting yourself from electric shock:  
Never.touch.the.plug.with.wet.hands..  
Always.pull.out.by.the.plug.and.never.the.cord..  
Only let a qualified professional repair the equipment. An  
unauthorized.person.might.touch.the.internal.parts.and.  
receive.a.serious.electric.shock..Note:.Removing.the.chassis.  
screws.and.opening.the.unit.will.automatically.void.your.  
warranty..  
Never.allow.a.child.to.put.anything.into.the.equipment..  
Protecting your NADY AUDIO Graphic Equalizer:  
Use.only.a.household.AC.power.source..Never.use.a.DC.  
4
 
Front Panel Controls & Connections  
2
3 4  
5
6
1
1
6
2
3 4  
5
2
3 4  
5
6
1
1. Power Switch  
stage.rumble.and.low.frequency.resonance.that.can.occur.while.  
To.turn.the.equalizer.ON.or.OFF,.press.the.upper.or.lower.portion.of. using.speakers.in.an.enclosed.acoustic.environment..The.LED.  
this.button..The.internal.LED.indicator.will.light.when.the.unit.is.on..  
status.indicator.will.light.yellow.when.the.Low.Cut.is.enabled..  
CAUTION: Always turn on your equalizer BEFORE your power  
amplifiers are turned on, and always turn off your equalizer  
AFTER your power amplifiers have been turned off to avoid any  
turn on/off transient noise.  
4. EQ ON/OFF  
This.switch.enables.or.bypasses.the.equalizer.filters..If.you.  
disable.the.EQ.ON/OFF.switch,.the.LED.will.turn.off.and.the.unit.  
will.be.in.bypass.mode..In.bypass.mode,.the.audio.signal.will.flow.  
through.without.any.equalization.although.the.Gain.control.will.still.  
be.active..  
ꢀ. Gain Control  
The.Gain.control.allows.adjustment.between.OFF.(center.  
detent).and.+/-12dB..This.control.is.used.to.adjust.for.variation.  
in.input.level.to.the.equalizer.channel,.or.to.compensate.for.  
the.equalization.applied.to.the.input.signal..Unity.gain.can.be.  
achieved.by.setting.this.control.to.its.center.detent.position..The.  
5. Output Level LED Bargraph  
This.four-stage.LED.bargraph.illuminates.according.to.the.output.  
signal.level..The.red.Peak.LED.lights.at.3dB.prior.to.clipping..  
Occasional.blinking.of.the.Peak.LED.is.acceptable,.but.if.it.  
unit.is.equipped.with.a.red.Peak.LED,.which.illuminates.when.the. remains.on.more.than.intermittently.you.should.turn.down.either.  
signal.reaches.3dB.prior.to.clipping..It.is.acceptable.for.the.Peak.  
LED.to.flash.occasionally,.however,.if.the.Peak.LED.is.flashing.  
steadily,.the.Gain.control.should.be.reduced.to.avoid.distortion..  
the.equalizer’s.level.controls.or.reduce.the.input.Gain.level..  
6. Filter Level Slider Controls  
Each.one.of.these.linear.potentiometers.will.boost.or.cut.its.noted.  
frequency.by.+/-12dB..When.all.of.the.sliders.are.in.center.detent.  
position,.the.output.of.the.equalizer.is.flat..Each.slider.is.marked.  
with.the.center.frequency.of.its.band.pass.filter..  
3. Low-Cut Filter  
This switch enables a low cut filter at 40Hz, 12dB/octave to  
remove.unwanted.low.frequencies.from.the.signal.to.prevent.  
5
 
Rear Panel Controls & Connections  
8
7
9
8
9
7
8
7
9
7. IEC Power Cord Receptacle  
CAUTION: After checking the AC supply voltage, be sure that the  
correct fuse is in the fuse holder. A 20mm glass tube 500mA 250V  
fast-blow fuse should be used.  
This.is.used.to.connect.the.AC.power.source.to.your.equalizer..  
Power requirements: 115VAC, 60Hz  
CAUTION: For new installations and portable sound systems,  
or in any situation in which the AC power is suspect, it is wise to  
confirm appropriate voltage and line polarity BEFORE connecting  
the instrument to the power source.  
9. Input/Output Connectors  
Balanced.XLR.and.1/4”.TRS.Inputs.and.unbalanced.output.jacks.  
for.line.level.operation..Line.level.signals.from.-.18dBu.to.+18dBu.  
are.considered.normal..Do.not.directly.connect.microphones.into.  
the.equalizers..Microphones.require.a.pre.amp..  
8. Fuse Holder  
This.fuse.holder.contains.an.AC.primary.fuse..This.fuse.should.be. Note: Only one input and one output connector should be used at  
replaced.with.the.same.type.fuse.when.this.is.blown.out..If.they.  
continuously.blow,.stop.replacing.the.fuse.and.refer.servicing.to.  
qualified.personnel..  
a time.  
6
 
Typical Set-Up  
NADY.AUDIO.graphic.equalizers.may.be.used.wherever.modifi-  
cation.of.the.frequency.contour.of.a.sound.system.is.needed..A.  
graphic.equalizer.is.a.solution.to.any.number.of.sound.problems.  
or.creative.urges..  
engineer’s.bag..NADY.AUDIO.equalizers.offer.the.features.and.  
flexibility.to.perform.where.it.counts.in.the.studio..  
A. Fix.a.track.that.doesn’t.sound.quite.right..Put.the.equalizer.in.  
an.effects.send.and.return.it.to.the.MIX.bus..  
SOUND REINFORCEMENT APPLICATIONS  
B. Create an artificial stereo by splitting a monaural signal and  
equalizing.the.split.signals.differently,.then.panning.one.  
equalized.signal.to.the.right.and.the.other.signal.to.the.left..  
By.routing.the.signal.from.the.mixer.to.the.main.power.amplifiers.  
(or.crossover),.the.overall.frequency.of.the.mix.may.be.altered.to. C. Shape.the.sound.by.changing.the.frequency.response.of.the.  
do.a.number.of.things..  
track..  
D. Special.effects,.like.a.telephone.sound,.can.be.created.by.  
cutting off the LOW end to 200Hz and the HIGH end to  
6KHz.  
A. Through.the.use.of.a.real-time.audio.spectrum.analyzer,.a.  
calibrated.microphone,.and.a.pink.noise.source,.the.audio.  
system.may.be.“TUNED”.to.make.the.overall.audio.spectrum.  
response.of.the.audio.reinforcement.system.and.the.room.  
environment flatter in its frequency response.  
B. By.turning.up.the.audio.reinforcement.system.to.the.  
feedback.point,.then.attenuating.the.oscillating.frequency.  
(1/3.octave.resolution),.then.turning.the.system.up.to.  
attenuate.the.2nd.oscillating.frequency,.and.then.the.3rd,.  
and.so.on,.you.can.enable.the.entire.audio.system.to.have.  
much.more.gain.before.feedback..  
C. Amplifiers and speakers may be protected by the use of  
the.LOW.CUT.feature.of.the.equalizer..Wind.noise.or.the.  
loud.percussive.sound.of.dropped.microphones,.etc.,.could.  
potentially.cause.damage.to.the.amps.and/or.speakers..By.  
rolling.off.the.extreme.LOW.frequencies.with.the.LOW.CUT.  
filter, a measure of protection is added to the system without  
severely.affecting.the.overall.sound.quality..  
D. In.noisy.environments,.the.audio.signal.may.be.tailored.for.  
better.intelligibility.and.penetration..This.is.especially.useful.  
for.public.address.systems..  
E. Creative.use.of.the.equalizer.allows.shaping.of.the.signal.for.  
a.more.pleasing.sound.or.for.special.effects..The.only.limits.  
are.those.of.taste.and.imagination..  
MUSICAL INSTRUMENT APPLICATIONS  
A. Putting.an.equalizer.in.line.with.a.musical.instrument.allows.  
you.to.modify.the.sound.of.the.instrument..You.can.brighten.  
the.sound,.or.add.body.to.a.thin.sounding.instrument,.or.  
even.give.the.sound.a.totally.different.character..  
B. An.equalizer.will.allow.you.to.eliminate.unwanted.sounds,.  
like a 60-cycle HUM from a badly grounded amplifier.  
STUDIO APPLICATIONS  
A.graphic.equalizer.is.one.of.the.most.useful.tools.in.the.sound.  
7
 
Specifications  
EQUALIZER:  
THD + Noise  
Equalizer Control Bands  
<0.008% (@ 1KHz, all faders at mid position)  
Signal to Noise Ratio  
1X31, 1/3 Octave ISO Spacing From 20Hz to 20KHz  
2X31, 1/3 Octave ISO Spacing From 20Hz to 20KHz  
2X15, 2/3 Octave ISO Spacing From 25Hz to 16KHz  
95dB (@ 1KHz)  
Channel Separation  
Filter Type  
60dB (1KHz)  
Constant.Q.  
Line Voltage  
Slider Travel  
100-130V AC, 50/60Hz  
20mm (Center Detent) for GEQ 131/215/231  
Power Consumption  
Level Control Range  
Maximum:.15.watts.  
+/-12dB.  
SIZE:  
INPUTS:  
19” W X 3.5” H X 5” D (2U)  
(48.2cm.X.8.8cm.X.12.7cm).For.231  
Type  
Active.Balanced/Unbalanced.  
19” W X 1.75” H X 8.66” D (1U)  
Connectors  
(48.2cm.X.4.4cm.X.12.7cm).For.GEQ.131/215  
3-Pin.XLR,.1/4”.TS.(Balanced)  
WEIGHT:  
Impedance.  
4.15lbs..(1.9Kg.).GEQ.215.  
4lbs..(1.81Kg.).GEQ.131.  
6.85.lbs..(3.1Kg.).GEQ.231.  
40K Ωs Balanced; 20K Ωs Unbalanced  
Maximum Level  
28dBV.  
The specifications above are correct at the time of printing of  
this manual. For improvement purposes, all specifications for  
this unit, including design and appearance, are subject to  
change without prior notice.  
OUTPUTS:  
Type.  
Unbalanced.  
Connectors  
3-Pin.XLR,.1/4”.TRS.  
Impedance  
Typically < 400 Ωs  
Maximum Level  
+/-20dBV  
Clip LED Threshold  
3dB.(Below.Clipping).  
Low Cut Filter  
40Hz, 12dB/octave  
Frequency Response  
20Hz - 20KHz, +/- 1dB  
8
 
Notes  
9
 
Service For Your NADY AUDIO Product  
(U.S.) Should.your.NADY.AUDIO.product.require.service,.please.contact.the.NADY.Service.Department.via.telephone.  
at.(510) 65ꢀ-ꢀ411,.or.e-mail.at.[email protected].  
.
(International) For.service,.please.contact.the.NADY.AUDIO.distributor.in.your.country.through.the.dealer.from.whom.  
you.purchased.this.product.  
Do not attempt to service this unit yourself as it can be dangerous and will also void the warranty.  
NADY SYSTEMS, INC.  
6701 Shellmound Street, .  
Emeryville, CA 94608  
Tel: 510.652.2411 /Fax: 510.652.5075.  
 

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