Infinity PS-10, PS-12 Service manual

PS-10

PS-12

PS Series Powered Subwoofers

SERVICE MANUAL

Infinity Systems Incorporated

250 Crossways Park Dr.

Woodbury, New York 11797 Rev1 10/2004

PS-10/PS-12

BASIC SPECIFICATIONS . . . . . . . . . …………………………….... .. . . . . . 1

PS-10 DETAILED SPECIFICATIONS . . . . . . . . . . . . . . ..…. . .. .. .. . . . . . 2

PS-12 DETAILED SPECIFICATIONS . . . . . . . . . . . . . . .….. . .. .. .. . . . . . 4

CONTROLS & CONNECTIONS . . . . . . . . . . . …………………………. . . . 6

OPERATION……. . . . . .. . . . . . . . .. .. . . . .. .. . . . . ………… . . ... . . . . . . . 8

PS-10 BLOCK DIAGRAM……………... ………………… . … . .. .. . . .. . … . 9

PS-12 BLOCK DIAGRAM……………... ………………… . …. .. .. . . .. . … . 10

PS-10/12 TEST SET-UP AND PROCEDURE……………………………….…11

TECH TIP INFTT2003-02……………... ………………… . …. .. .. . . .. . … . 12

PS-10 EXPLODED VIEW . . . . . . . . …………………………….... .. .. . . . . 13

PS-12 EXPLODED VIEW . . . . . . . . …………………………….... .. .. . . . . 14

PS-10 PACKING…. . . . . .. . . . . . . . .. .. . . . .. .. . . . ………..………………15

CONTENTS

PS-12 PACKING…. . . . . .. . . . . . . . .. .. . . . .. .. . . . ….……….……………16

PS-10 ELECTRICAL PARTS LIST …………. .... . . . . .. …………….... . . . . 17

PS-12 ELECTRICAL PARTS LIST …………. .... . . ……………….. .. .. . . . . 21

PCB DRAWINGS. .. . . . . . . . . . . . . . .. . . . . ………………………….. . . . . . 25

IC – TRANSISTOR PINOUTS . … . . .. . . . . . …………………..…..…... . . . 28

PS-10 SCHEMATIC DIAGRAMS . . . . . . . . .. .. .. .. . . .….………...……. . . .29

PS-12 SCHEMATIC DIAGRAMS . . . . . . . . .. .. .. .. . . .………..…..……. . . .31

SPECIFICATIONS PS-10 PS-12

Frequency Response: 27Hz – 150Hz (±3dB) 25Hz – 150Hz (±3dB) Maximum Amplifier Output: 250 watts RMS 300 watts RMS

(20Hz – 150Hz with no more than 0.1% THD)

Crossover Frequencies: 50Hz – 150Hz, 50Hz – 150Hz

24dB/octave, continuously variable

Driver: 10" (254mm) MMD™ 12" (305mm) MMD™ Dimensions (H x W x D): 14 3/4" x 12-1/2" x 16" 16-1/2" x 14-3/8" x 17-1/2"

(375mm x 318mm x 406mm) (419mm x 365mm x 445mm)

Weight: 38 lb (17.3kg) 45 lb (20.5kg)

Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and construction details in this and related Infinity publications are therefore subject to change without notice.

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PS-10/PS-12

PS-10 Powered Sub/ Plate Amp

LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes

US 120vac/60Hz Yes 108-132 120 Vrms Normal Operation EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required

Parameter Specification Unit Amp Section

Type (Class AB, D, other) D n/a n/a Load Impedance (speaker) 5.6 Ohms n/a Nominal Rated Output Power (120VAC) 150 Watts 138 Domestic version only 120 VAC-60 Hz Rated Output Power (230VAC) 150 Watts 128 EU Version only 230 VAC-50 Hz

AVG RMS Dynamic Power 250 Watts 225

THD @ Rated Power 0.5 % 1 22K filter 145 Watts THD @ 1 Watt 0.1 % 0.5 22K filter DC Offset 10 mV-DC 30 Amplifier output

Damping factor >50 DF 20 Measured at amplifier board

Input Sensitivity

Input Frequency 35 Hz 35 Nominal Freq. L&R 300 mVrms ±2dB To 150 Watts, Ap Zo=600 Ohms Single input driven L or R input 300 mVrms ±2dB To 150 Watts , Ap Zo=600 Ohms Single input driven, LFE switch ON Speaker/Hi Level Input 2.6 Vrms ±2dB To 150 Watts Single input driven

Signal to Noise

SNR-A-Weighted 90 dBA 85 relative to rated power A-Weighting filter SNR-unweighted 85 dBr 75 relative to rated power 22K filter SNR rel. 1W-unweighted 65 dBr 60 relative to 1W Output 22K filter

Residual Noise Floor 1 mVrms 1.5

Residual Noise Floor 1.5 mVrms

Input Impedance

Line Input (L, R,LFE) 10K ohms n/a Nominal Speaker/Hi Level Input > 4.7K ohms n/a Nominal

QA Test

Limits

max)1.5

Volume @max, using RMS reading DMM/VOM (or A/P) BW=20 Khz.

Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics) (BW=20 Khz)

Conditions Notes

verage RMS power, 3/20 Cycles 50 Hz, Driven

6dB above its input sensitivity sensitivity

Measured at the amplifier board. 150 Watts @ 50 Hz, THD must be less tan 0.1%

Line level inputs must be terminated using 1KOHM

Filters

LP filter 4th order fixed 50-150 Hz ± 10 2nd Order variable and 2nd order fix 2nd order variable + 2nd order fix-24 db/Octave HP Filter 2nd order Fixed F=32 Hz, Q=0.95

LFE Low pass 2nd order 200>LP<1K Hz LFE input driven only Notch filter (Friend circuit) F=61.6 Hz, Q=4, Av=-3.5dB HP speaker out connector Left & Right 200 Hz ± 10 Speaker input driven - 4 Ohms (Applies to 230VAC model only) Left & Right 100 Hz ± 10 Speaker input driven - 8 Ohms (Applies to 230VAC model only)

Limiter

THD at Max. Output Power n/a n/a functional Maximum Output Power Maximum THD as a result of limiting.

Features

Volume pot Taper (lin/log) LOG -- functional A Taper Speaker input connectors YES functional L&R Speaker input binding post connectors

HP Speaker out YES functional Phase switch 0-180 deg functional

LP Filter defeat switch YES functional Disables LP filter, intended for LFE

Input Configuration

Line In (L,R) & LFE YES -- functional Dual RCA jack Spkr/Hi Level In YES -- functional Binding post connector L&R

Signal Sensing (ATO)

Auto-Turn-On (yes/no) YES functional ATO Input test frequency 50 Hz functional " ATO Level LFE Input 2 mV functional " Maximum acceptable level. ATO Level Speaker in 40 mV functional " Maximum acceptable level.

ATO Turn-on time 5 ms functional

Auto Mute/ Turn-OFF Time 15 minutes 18

L&R Speaker out with HP applies only to 230VAC models

Amp connected and AC on, then input signal applied T before muting, after line or speaker level signal is removed

Auto turn of time (T) must be 5 > T < 18 Minutes

Power on Delay time

Transients/Pops

ATO Transient 5 mV-peak n/a @ Speaker Outputs

3 sec. 4 AC Power Applied

PS-10/PS-12

Turn-on Transient 50 mV-peak 2V-pk-pk @ Speaker Outputs AC Line cycled from OFF to ON Turn-off Transient 50 mV-peak 2V-pk-pk @ Speaker Outputs AC Line cycled from ON to OFF

Efficiency

Efficiency 65 % 65 Nominal Line voltage 120 VAC

Stand-by Input Power 18 Watts 20 @ nom. line voltage

Power Cons. @ rated power 230 Watts 240 @ nom. line voltage 150 Watts into 5.6 Ohms @ nominal line voltage

Maximum allowable input power under nominal Input voltage and frequency, HOT or COLD operation.

Protections

Short Circuit Protection YES functional Direct short at output

Thermal Protection YES functional

DC Offset Protection YES - DC present at Speaker Out leads

Line Fuse Rating USA-Domestic 2 Amps 2 Type-T or Slo Blo-250 V Internal fuse with UL/SEMKO rated holder

EU (230v) 1.25 Amps 1.25

4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.

5.- EURPOEAN VERSION MUST BE PROVIDED WITH PLASTIC PLUGS ON THE BINDING POST CONNECTORS

@1/8 max unclipped Power at 1.06 times the input voltage

Type-T or Slo Blo-250 V, Low Breaking capacity

Amplifier should resume operation after short circuit condition removal Temperature rise in accessible metal parts should not exceed 35K rise for domestic version or 30K rise for European versions (refer to requirements sheet). Design must insure no Offset at the speaker output under any operating condition including abnormal operation

Internal fuse with UL/SEMKO rated holder

PS-10/PS-12

PS-12 Powered Sub/ Plate Amp

LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes

US 120vac/60Hz Yes 108-132 120 Vrms Normal Operation EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required

Parameter Specification Unit

Amp Section

AVG RMS Dynamic Power 250 Watts 225

THD @ Rated Power 0.5 % 1 22K filter 140 Watts THD @ 1 Watt 0.1 % 0.5 22K filter DC Offset 10 mV-DC 30 Amplifier output

Damping factor >50 DF 20 Measured at amplifier board

Input Sensitivity

Input Frequency 35 Hz 35 Nominal Freq. L&R 250 mVrms ±2dB To 150 Watts, Ap Zo=600 Ohms Single input driven L or R input 250 mVrms ±2dB To 150 Watts , Ap Zo=600 Ohms Single input driven, LFE switch ON Speaker/Hi Level Input 2.3 Vrms ±2dB To 150 Watts Single input driven

Signal to Noise

SNR-A-Weighted 90 dBA 85 relative to rated power A-Weighting filter SNR-unweighted 85 dBr 75 relative to rated power 22K filter SNR rel. 1W-unweighted 65 dBr 60 relative to 1W Output 22K filter

Residual Noise Floor 1 mVrms 1.5

Residual Noise Floor 1.5 mVrms(max) 1.5

QA Test

Limits

Conditions Notes

Volume @max, using RMS reading DMM/VOM (or A/P) BW=20 Khz.

Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics) (BW=20 Khz)

Average RMS power, 3/20 Cycles 50 Hz, Driven 6dB above its input sensitivity sensitivity

Measured at the amplifier board. 140 Watts @ 50 Hz, THD must be less than 0.1%

Line level inputs must be terminated using 1KOHM

Input Impedance

Line Input (L, R,LFE) 10K ohms n/a Nominal Speaker/Hi Level Input > 4.7K ohms n/a Nominal

Filters

LP filter 4th order fixed 50-150 Hz ± 10 2nd Order variable and 2nd order fix 2nd order variable + 2nd order fix-24 db/Octave HP Filter 2nd order Fixed F=29 Hz, Q=1.5

LFE Low pass 2nd order 200>LP<1K Hz LFE input driven only Notch filter (Friend circuit) 54 Hz, Q=1.738, Av=-5.0dB HP speaker out connector Left & Right 200 Hz ± 10 Speaker input driven - 4 Ohms (Applies to 230VAC model only) Left & Right 100 Hz ± 10 Speaker input driven - 8 Ohms (Applies to 230VAC model only)

Limiter

THD at Max. Output Power n/a n/a functional Maximum Output Power Maximum THD as a result of limiting.

Features

Volume pot Taper (lin/log) LOG -- functional A Taper Speaker input connectors YES functional L & R Binding post connector

HP Speaker out YES functional Phase switch 0-180 deg functional

LP Filter defeat switch YES functional Disables LP filter, intended for LFE

Input Configuration

Line In (L,R) & LFE YES -- functional Dual RCA jack Spkr/Hi Level In YES -- functional Binding post connector L&R

Signal Sensing (ATO)

ATO Turn-on time 5 ms functional

Auto Mute/ Turn-OFF Time 15 minutes 18

L & R Binding post connectors and High pass filter (Applies only to 230V model)

Amp connected and AC on, then input signal applied T before muting, after line or speaker level signal is removed

Auto turn of time (T) must be 5 > T < 18 Minutes

Power on Delay time

3 sec. 4 AC Power Applied

PS-10/PS-12

Parameter Specification Unit

Transients/Pops

ATO Transient 5 mV-peak n/a @ Speaker Outputs Turn-on Transient 50 mV-peak 2V-pk-pk @ Speaker Outputs AC Line cycled from OFF to ON Turn-off Transient 50 mV-peak 2V-pk-pk @ Speaker Outputs AC Line cycled from ON to OFF

Efficiency

Efficiency 65 % 65 Nominal Line voltage 120 VAC

Stand-by Input Power 18 Watts 20 @ nom. line voltage

Power Cons. @ rated power 230 Watts 240 @ nom. line voltage 150 Watts into 5.6 Ohms @ nominal line voltage

QA Test

Limits

Conditions Notes

Maximum allowable input power under nominal Input voltage and frequency, HOT or COLD operation.

Protections

Short Circuit Protection YES functional Direct short at output

Thermal Protection YES functional

DC Offset Protection YES - DC present at Speaker Out leads

Line Fuse Rating USA-Domestic 2 Amps 2 Type-T or Slo Blo-250 V Internal fuse with UL/SEMKO rated holder

EU (230v) 1.25 Amps 1.25

4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.

5.- EURPOEAN VERSION MUST BE PROVIDED WITH PLASTIC PLUGS ON THE BINDING POST CONNECTORS

@1/8 max unclipped Power at 1.06 times the input voltage

Type-T or Slo Blo-250 V, Low Breaking capacity

Internal fuse with UL/SEMKO rated holder

PS-10/PS-12

Rear Panel

CONTROLS AND CONNECTIONS

Subwoofer-Level Control

™

LFE/Normal Selector

Phase Switch

Crossover Adjustment

∞

Line-Level/LFE Input

Speaker-Level Inputs

Power Switch

•

Status LED

PS-10/PS-12

•

Green: On

Red: Stand-By

CROSSOVER FREQUENCY

LINE LEVEL IN

LEVEL

+ –

Min

LFE NORMAL

0º

PHASE

80Hz

50Hz

L R

∞

For LFE use L or R

HIGH

LEVEL

Max

180º

150Hz

™

POWER

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL 

SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

AVERTISSEMENT: POUR PRÉVENIR LES RISQUES D'INCENDIE OU DE CHOC 

ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA PLUIE OU A L'HUMIDITÉ.

OFF

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

120V

60Hz

NRTL/C CSA 22.2 UL1492

PS-10/PS-12

SYSTEM CONNECTIONS

If your receiver/processor does not contain a Dolby Digital or

DTS processor but has subwoofer outputs:

Set line-level/LFE switch to “Normal.”

NOTE: If your receiver/processor

has only one sub out,you may use either the L or R input.

If you have a Dolby* Digital or DTS

receiver/processor with a low-frequency-effects (LFE) or subwoofer output:

CROSSOVER FREQUENCY

LEVEL

LINE LEVEL IN

PHASE

Min

Max

L R

For LFE use L or R

LFE NORMAL

HIGH

LEVEL

50Hz

0º 180º

150Hz

RECEIVER/AMPLIFIER

Front Speaker Output

80Hz

Green: On

Red: Stand-By

+ –

CROSSOVER FREQUENCY

LEVEL

LINE LEVEL IN

PHASE

Min

Max

L R

For LFE use L or R

LFE NORMAL

HIGH

LEVEL

+ –

50Hz

0º 180º

150Hz

RECEIVER/PROCESSOR

80Hz

L R

Green: On

Red: Stand-By

CROSSOVER FREQUENCY

LEVEL

LINE LEVEL IN

PHASE

Min

Max

L R

For LFE use L or R

LFE NORMAL

50Hz

0º 180º

150Hz

SUBWOOFER OR LFE OUTPUT

80Hz

Green: On

Red: Stand-By

Set LFE/Normal switch to “LFE.”

This figure shows how to connect bare wires to the terminals.

If your receiver/processor does not have subwoofer outputs for the left and right channels or an LFE output,connect speaker wire from your receiver/amplifier to your speakers and subwoofer using two sets of speaker wire:

PS-10/PS-12

RED =

–

BLACK =

LOOSEN TERMINALS

INSERT BARE END;  TIGHTEN TERMINALS

NO STRIPE = –STRIPE =

PS-10/PS-12

OPERATION

Power On

Plug your subwoofer’sAC cord into a wall outlet.Do not use the outlets on the back of the receiver.

Initially set the Subwoofer-Level Control

to the “min”position.

Turn on your sub by pressing the Power Switch

on the rear panel.

Turn on your entire audio system and start a CD or movie soundtrack at a moderate level.

Auto On/Stand-By

With the Power Switch ¶in the ON position,the Status LED •on the back panel will remain lit in red or green to indicate the On/Standby mode of the subwoofer.

RED = STANDBY (No signal detected,Amp Off) GREEN = ON (Signal detected,Amp On) The subwoofer will automatically enter the Standby mode after approxi-

mately 10 minutes when no signal is detected from your system.The subwoofer will then power ON instantly when a signal is detected.During periods of normal use,the Power Switch

can be left on.You may turn

off the Power Switch

for extended periods of nonoperation,e.g.,when

you are away on vacation.

Adjust Gain

Turn your Subwoofer-Level Control ¡up to the halfway position.If no sound emanates from the subwoofer,check the AC-line cord and input cables.Are the connectorson the cables making proper contact? Is the AC plug connected to a “live”receptacle? Has the Power Switch

been pressed to the “On”position? Once you have confirmed that the subwoofer is active,proceed by playing a CD,record or cassette. Use a selection that has ample bass information.

Set the overall volume control of the preamplifier or stereo to a comfortable level.Adjust the Subwoofer-Level Control

until you obtain a pleasing blend of bass.Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range.Many users have a tendency to set the subwoofer volume too loud,adhering to the belief that a subwoofer is there to produce lots of bass.This is not entirely true.A subwoofer is there to enhance bass, extending the response of the entire system so the bass can be felt as well as heard.However, overall balance must be maintained or the music will not sound natural.An experienced listener will set the volume of the subwoofer so its impact on bass response is always there but never obtrusive.

Phase Control

The Phase Switch £determines whether the subwoofer speaker’s pistonlike action moves in and out with the main speakers,0˚,or opposite the main speakers,180˚.P roper phase adjustment depends on several variables such as room size,subwoofer placement and listener position. Adjust the phase switch to maximize bass output at the listening position.

Crossover Adjustment

The Crossover Adjustment Control ¢ determines the highest frequency at which the subwoofer reproduces sounds.If your main speakers can comfortably reproducesome low-frequency sounds,set this control to a lower frequency setting,between 50Hz and 100Hz.This will concentrate the subwoofer’s efforts on the ultradeep bass sounds required by today’s films and music.If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies,set the Crossov er Adjustment control to a higher setting, between 120Hz and 150Hz.

NOTE:This control will have no effect if the LFE/Normal Selector

™ is set

to LFE.If you have a Dolby Digital or DTS processor/receiver, the Low-Pass Frequency is set by the processor/receiver. Consult your owner’s manual to learn how to view or change this setting.

MAINTENANCE AND S

ERVICE

The enclosure may be cleaned using a soft cloth to remove fingerprints or to wipe off dust.

The grille may be gently vacuumed.Stains may be removed with an aerosol cleaner, following its instructions.Do not use any solvents on the grille.

All wiring connections should be inspected and cleaned or remade periodically.The frequency of maintenance depends on the metals involved in the connections,atmospheric conditions,and other factors,but once per year is the minimum.

If a problem occurs,make sure that all connections are properly made and clean.If a problem exists in one loudspeaker,reverse the connection wires to the left and right system.If the problem remains in the same speaker,then the fault is with the loudspeaker.If the problem appears in the opposite speaker,the cause is in another component or cable. In the event that your subwoofer ever needs service,contact your local Infinity dealer or Infinity directly at 1.516.674.4INF or www.infinitysystems.com for a service center near you.

PS-10/PS-12

PS-10 BLOCK DIAGRAM

PS-10/PS-12

+ 23 hidden pages