Sonodyne SSP 2025 Manuale utente

SSP 2025

dual channel 31 band graphic equalizer I owners manual

www.sonodyne.com

SSP 2025 page 1

STATUTORY INFORMATION/ PRECAUTIONS

IMPORTANT SAFETY INSTRUCTIONS

1. Read and follow these instructions.

2. Do not use this apparatus near water.

3. Clean with dry cloth only.

4. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

5. Do not install near any heat sources such as radiators, stoves, or other apparatus (including ampliﬁers)

that produce heat.

6. Do not defeat the safety purpose of the polarized or grounding-type plug. A grounding type plug has two

poles and a third grounding pole. The thick pole is provided for your safety. If the provided plug does not

ﬁt into your outlet, consult an electrician for replacement of the outlet

7. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles,

and the point where they exit from the apparatus.

8. The apparatus shall be connected to a MAINS socket outlet with a protective earthing connection.

9. Unplug this apparatus during lightning storms or when unused for long periods of time.

10. Refer all servicing to qualiﬁed service personnel. Servicing is required when the apparatus has been

damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects

have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate

normally, or has been dropped.

The lightning ﬂash with arrowhead symbol within an equilateral triangle is intended to alert

the user to the presence of “un-insulated dangerous voltage” within the product’s enclosure

that may be of sufﬁcient magnitude to constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the user to the

presence of important operating and maintenance (servicing) instructions in the literature

accompanying the product.

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE

CONNECTORS

XLR-type connectors are wired as follows (IEC60268 standard): pin 1: ground, pin 2: hot (+), pin 3: cold (-).

Thank you for purchasing the Sonodyne Graphic Equalizer. Please read this manual thoroughly to get the

most out of the product and ensure long-term, trouble-free use. After reading this manual, keep it available

for future reference.

MAIN FEATURES

• Two31-band,1/3-octaveConstantQfrequencybands

• NoiseReduction

• Limiter

• Switchable+-6dband+-15dbgain

• 18db/octave40HzBessellow-cutlter

• Groundlift

• -12dBto+12dBinputgainrange

• XLR,TRSandBarrierstripconnectors

• Power-offhard-wirerelaybypasswith2secpowerupdelay

IN THE BOX

Verify that the package contains the following:

• Equalizerunit

• ACpowercord

• OperatingManual

• Fourrackmountscrewsandwashers

SSP 2025 page 2

MAIN FEATURES/ IN THE BOX

FRONT PANEL

SSP 2025 page 3

1. NR (Noise Reduction) SWITCH AND LED: The switch engages the Noise Reduction circuit

 withintheEQ.TheNoiseReductionyellowLEDlightsupwhentheNoiseReductionswitchispressed

2. EQ BYPASS SWITCH and LED: Engaging this switch removes the graphic equalizer section

 fromthesignalpath.TheBYPASSswitchdoesnot,however,affecttheINPUTGAIN,orLOWCUT

 lters.TheEQBypassLEDlightsupwhentheswitchispressed

3. INPUT GAIN CONTROL: This control sets the signal level input to the equalizer. It varies the

 signallevelfrom-12dBto+12dB.ItseffectcanbeviewedontheOUTPUTLEVELBARGRAPH

4. LOW CUT SWITCH:TheLOW-CUTswitchwhenpressedinsertsan18dB/octave40HzBessel

low-cut ﬁlter into the signal path

5. LIMITER THRESHOLD CONTROL: This control engages the limiter. It sets the threshold

 levelatwhichgainreductionbeginstooccur.Thecontrolrangeis0dButo“OFF”(+24dBu).Whenthe

threshold control is set to “OFF”, the limiter is disabled

6. BOOST/CUT RANGE SELECTION SWITCH and LEDS: This switch selects the two

 boost/cutrangesoftheequalizer,either±6dBor±15dB.TheredLEDlightswhenthe±15dBrangeis

 selected,andtheyellowLEDlightswhenthe±6dBrangeisselected

1 2 43 5 6

7 8 9 10

FRONT PANEL

SSP 2025 page 4

7. CLIP LED:ThisLEDlightswheneveranyinternalsignallevelreaches3dBbelowclipping

8. OUTPUT BAR GRAPH LEVEL: These four LEDs indicate output level of the equalizer. The red

 LEDis3dBbelowclippingandismarkedas+18dBu.Itmonitorsthelevelattheoutputofthe

equalizer after all other processing, including the limiter

9. GAIN REDUCTION METER: These four LEDs indicate the amount of gain reduction introduced

by the setting of the LIMITER THRESHOLD control

10. FREQUENCY BAND SLIDER CONTROLS: Each one of these slider potentiometers will

 boostorcutatitsrespectivefrequencyby±6dBor±15dB,dependinguponthepositionofthe

 BOOST/CUTRANGEswitch.Whenalltheslidersareinthecenterdetentpositionthefrequency

 responseoftheequalizerisat.Thefrequencybandcentersaremarkedat1/3rdoctaveintervalson

ISO standard spacing

SSP 2025 page 5

The Equalizer has balanced inputs and outputs that can be used with any balanced or unbalanced line-

level device. For more speciﬁc information about cabling possibilities, please refer to the section entitled

INSTALLATION CONSIDERATIONS.

• Turn off all equipment before making connections.

• Mount equalizer in a standard-width rack.

 InstalltheEQsinarackwiththerackscrewsprovided.Itcanbemountedaboveorbelowanything

that does not generate excessive heat. Ambient temperatures should not exceed 45°C when

equipment is in use. Although the unit’s chassis is shielded against radio frequency and

electromagnetic interference, extremely high ﬁelds of RF and EMI should be avoided.

• Make audio connections via XLR, barrier strip, or 1/4” TRS jacks (according to

application needs)

All three types of connectors for the inputs and outputs can be used for balanced or unbalanced

connections.

The use of more than one connector at a time for the inputs could unbalance balanced lines, cause

phase cancellation, short a conductor to ground, or cause damage to other equipment connected to

the equalizer. More than one output may be used simultaneously as long as the combined parallel load

is greater than 600Ω.

• Select the operating range with the BOOST/CUT RANGE SELECTION switch

 NOTE:Besuretoreduceaudiolevelsatthepoweramplierswhenchangingthesettingofthisswitch

as it may generate an audible transient.

• Apply power to the equalizer

Connect the AC power cord to the AC power receptacle on the back of the equalizer. Route the AC

power cord to a convenient power outlet away from audio lines. The unit may be turned on and off

from the rear panel power switch or a master equipment power switch. Since the Equalizers consume

a relatively small amount of power, the units may be left on continuously.

CONNECTING THE EQ TO YOUR SYSTEM

SSP 2025 page 6

REAR PANEL

1. IEC AC INLET: Connect the socket end of the mains cable provided with this unit to this socket and

the plug end to a 230V AC outlet. Ensure that the ground pin of the AC outlet has a ﬁrm connection

with the earth of the premises. This is both in the interests of your own safety as well as to eliminate

ground related hum and buzz problems

2. POWER SWITCH: Switches the power on and off. Always make audio connections with the

power switch in the OFF position

3. OUTPUT CONNECTORS: Three types of output connectors are provided for output

 connections:maleXLRtypeconnectors,1/4”tip-ring-sleevephonejackconnectorsandabarrier

strip

4. CHASSIS GROUND LIFT STRAP: Byremovingthejumperconnectingthetwoscrewson

the barrier strip, the chassis ground is separated from the circuit ground of the equalizer. This is

sometimes necessary to prevent “ground loops” in a sound system. When lifting the ground strap, you

must make a connection from the circuit ground terminal to some other ground point in your audio

system in order for the equalizer to function properly

5. INPUT CONNECTORS: Three types of input connectors are provided for input connections:

 femalelockingXLRtypeconnectors,1/4”tip-ring-sleevephonejackconnectors,andabarrierstrip.

 Themaximuminputlevelthattheequalizercanacceptwithoutclippingis+22dBu(ref:0.775Vrms)

1 2 43 5

INSTALLATION CONSIDERATIONS

HOOKUPS AND CABLING:TheEqualiserisdesignedfornominal+4dBulevels.Theequalizercan

be used with either balanced or unbalanced sources, and the outputs can be used with either balanced or

unbalanced loads, provided the proper cabling is used.

INPUT CABLE CONFIGURATIONS: The equalizer has an input impedance of 40kΩ balanced and

20kΩ unbalanced. This makes the Equalizer’s audio inputs suitable for use with virtually any low source

impedance (under 2kΩ).

OUTPUT CABLE CONFIGURATIONS: The equalizer’s output is capable of driving a 600Ω load to

+18dBu.Formaximumhumrejectionwithabalancedsource,avoidcommongroundingattheequalizer’s

inputs and outputs. Most balanced (3-conductor) cables have the shield connected at both ends. This can

result in ground loops which cause hum. If hum persists try disconnecting the shield on one or more of the

cables in the system, preferably at the input of a device, not at the output.

SSP 2025 page 7

WIRING CONNECTIONS WITH GROUND

WITHOUT JUMPER IN PLACE WITH JUMPER IN PLACE

CIRCUIT

GROUND

OUTPUT

CABLE

OUTPUT

CABLE

OPTIONAL OPTIONAL

INPUT

CABLE

INPUT

CABLE

TOSYSTEM

GROUND

CIRCUIT

GROUND

CHASSIS

GROUND

CHASSIS

GROUND JUMPER

NO SOUND If there appears to be no power:

•CheckthateitherthestereoormonoLEDonthefrontpanel

of the crossover is lit.

•Checkthatthepowercordisseatedproperlyintheback

panel of the crossover and that it is plugged into an active

AC power source.

IF THERE APPEARS TO BE

POWER, BUT NO AUDIBLE

SIGNAL

•Conrmthatactiveaudiolinesareconnectedtothe

crossover’s inputs and outputs.

•Checkthatboththeinputandoutputgaincontrolsare

advanced sufﬁciently.

•Checktomakesurethatyouhaveturneduptheampliers’

outputs.

HUM AND/OR BUZZ If you suspect that the hum is caused by a ground loop:

•Systematicallyremoveand/orconnecttheaudiogroundsof

the devices in the signal path

•Remember,forsafetyyoumustmaintainconnectionto

chassis ground. Never lift a safety ground

IF YOU SUSPECT THE HUM IS

NOT CAUSED BY A GROUND

LOOP

•Checktheaudioatanearlierstageintheaudiochain.

•Lowlevelequipmentshouldbemountedawayfrompower

ampliﬁers to avoid induction of this type of hum.

•Becertainthatallaudiowiringexceptforloudspeakerlines

is well shielded, and that low level wiring is not run parallel

toand/orincloseproximitytoACpowerwiring.

INTERMITTENT AUDIO •Checktheotherequipmentandthewiringtomakecertain

that the signal is not Intermittent earlier in the chain.

•Checktheintegrityofallcablesusingacabletester.

TROUBLESHOOTING

SSP 2025 page 8

INPUTS

CONNECTORS

TYPE

IMPEDANCE

MAX INPUT LEVEL

CMRR

1/4”TRS,femaleXLR(pin2hot),andbarrierterminalstrip

Electronicallybalanced/unbalanced,RFltered

Balanced40kΩ,unbalanced20kΩ

>+21dBubalancedorunbalanced

>40dB,typically>55dBat1kHz

OUTPUTS

CONNECTORS

TYPE

IMPEDANCE

MAX OUTPUT LEVEL

1/4”TRS,maleXLR(pin2hot),andbarrierterminalstrip

Balanced/unbalanced,RFltered

Balanced120Ω,unbalanced60Ω

>+21dBubalanced/unbalancedinto2kΩorgreater

>+18dBmbalanced/unbalanced(into600Ω)

SYSTEM PERFORMANCE

BANDWIDTH

FREQUENCY RESPONSE

NOISE REDUCTION IN

SIGNAL TO NOISE RATIO

DYNAMIC RANGE

NOISE REDUCTION OUT

SIGNAL TO NOISE RATIO

DYNAMIC RANGE

NOISE REDUCTION OUT

SIGNAL TO NOISE RATIO

DYNAMIC RANGE

THD + NOISE

INTERCHANNEL CROSSTALK

NOISE REDUCTION

20Hz~20kHz,+0.5/-1dB

<10Hzto>50kHz,+0.5/-3dB

(±6and±15dBrange):

>100dB,unweighted,ref:+4dBu,22kHzmeasurementbandwidth

>118dB,unweighted

(±6dBrange):

>94dB,unweighted,ref:+4dBu,22kHzmeasurementbandwidth

>112dB,unweighted

(±15dBrange):

>90dB,unweighted,ref:+4dBu,22kHzmeasurementbandwidth

>108dB,unweighted

<0.04%,0.02%typicalat+4dBu,1kHz

<0.5%at1kHzwith15dBgainreduction

<-80dB,20Hzto20kHz(2215/2231)

Upto20dBofdynamicbroadbandnoisereduction

FUNCTION SWITCHES

EQ BYPASS

LOW CUT (recessed)

RANGE (recessed)

Activates Noise Reduction

Bypassesthegraphicequalizersectioninthesignalpath

Activatesthe40Hz18dB/octaveBesselhigh-passlter

Selectseither±6dBor±15dBsliderboost/cutrange

INDICATORS

OUTPUT LEVEL

GAIN REDUCTION

TYPE III NR

EQ BYPASS

CLIP

LOW CUT

±6dB

±15dB

4-LEDbargraph(Green,Green,Yellow,Red)at-10,0,+10,and+18dBu

4-LEDbargraph(allRed)at0,3,6,and10dB

1 LED: yellow

1 LED: red

1 LED: yellow

1 LED: red

POWER SUPPLY

OPERATING VOLTAGE

POWER CONSUMPTION

MAINS CONNECTION

230VAC50/60Hz

28W

IEC receptacle

PHYSICAL

DIMENSIONS (HxWxD)

WEIGHT

134 mm x 483 mm x 201 mm

4.8kg

Due to continuous improvements, all speciﬁcations are subject to change

SPECIFICATIONS

SSP 2025 page 9

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