GEQ Series
Graphic Equalizers
Owner’s Manual
250
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1.25K
5K
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8K
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LOW
CUT
POWER
EQ
+12
+6
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0
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+12
+6
+3
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+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
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CH
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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
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+12
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+12
OFF
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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
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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
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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
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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
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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
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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
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Notes
9
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Service For Your NADY AUDIO Product
(U.S.) Should.your.NADY.AUDIO.product.require.service,.please.contact.the.NADY.Service.Department.via.telephone.
.
(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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