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

CONTENTS

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

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.

1

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	QA Test	Conditions		Notes
				Limits
	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		Average RMS power, 3/20 Cycles 50 Hz, Driven
						6dB above its input sensitivity sensitivity
	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	Measured at the amplifier board. 150 Watts @
						50 Hz, THD must be less tan 0.1%
	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	Volume @max, using RMS reading	Line level inputs must be terminated using
					DMM/VOM (or A/P) BW=20 Khz.	1KOHM
					Volume @max, w/ A/P Swept	Line level inputs must be terminated using
	Residual Noise Floor	1.5	mVrms(max)	1.5	Bandpass Measurement (Line
						1KOHM
					freq.+ harmonics) (BW=20 Khz)
	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=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		L&R Speaker out with HP applies only to
						230VAC models
	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	Amp connected and AC on, then
					input signal applied
	Auto Mute/ Turn-OFF Time	15	minutes	18	T before muting, after line or	Auto turn of time (T)	must be 5 > T < 18
					speaker level signal is removed	Minutes
	Power on Delay time	3	sec.	4	AC Power Applied
	Transients/Pops
	ATO Transient	5	mV-peak	n/a	@ Speaker Outputs

2

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
						Maximum allowable input power under nominal
	Stand-by Input Power	18	Watts	20	@ nom. line voltage	Input voltage and frequency, HOT or COLD
						operation.
	Power Cons. @ rated power	230	Watts	240	@ nom. line voltage	150 Watts into 5.6 Ohms @ nominal line voltage
	Protections
	Short Circuit Protection	YES		functional	Direct short at output	Amplifier should resume operation after short
						circuit condition removal
						Temperature rise in accessible metal parts
	Thermal Protection	YES		functional	@1/8 max unclipped Power at 1.06	should not exceed 35K rise for domestic version
					times the input voltage	or 30K rise for European versions (refer to
						requirements sheet).
						Design must insure no Offset at the speaker
	DC Offset Protection	YES		-	DC present at Speaker Out leads	output under any operating condition including
						abnormal operation
	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	Type-T or Slo Blo-250 V, Low	Internal fuse with UL/SEMKO rated holder
					Breaking capacity
	4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.
	5.- EURPOEAN VERSION MUST BE PROVIDED WITH PLASTIC PLUGS ON				THE BINDING POST CONNECTORS

3

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	QA Test	Conditions		Notes
				Limits
	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		Average RMS power, 3/20 Cycles 50 Hz, Driven
						6dB above its input sensitivity sensitivity
	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	Measured at the amplifier board. 140 Watts @
						50 Hz, THD must be less than 0.1%
	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	Volume @max, using RMS reading	Line level inputs must be terminated using
					DMM/VOM (or A/P) BW=20 Khz.	1KOHM
					Volume @max, w/ A/P Swept	Line level inputs must be terminated using
	Residual Noise Floor	1.5	mVrms(max)	1.5	Bandpass Measurement (Line
						1KOHM
					freq.+ harmonics) (BW=20 Khz)
	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		L & R Binding post connectors and High pass
						filter (Applies only to 230V model)
	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	Amp connected and AC on, then
					input signal applied
	Auto Mute/ Turn-OFF Time	15	minutes	18	T before muting, after line or	Auto turn of time (T)	must be 5 > T < 18
					speaker level signal is removed	Minutes
	Power on Delay time	3	sec.	4	AC Power Applied

4

PS-10/PS-12

	Parameter	Specification	Unit	QA Test	Conditions	Notes
				Limits
	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
						Maximum allowable input power under nominal
	Stand-by Input Power	18	Watts	20	@ nom. line voltage	Input voltage and frequency, HOT or COLD
						operation.
	Power Cons. @ rated power	230	Watts	240	@ nom. line voltage	150 Watts into 5.6 Ohms @ nominal line voltage
	Protections
	Short Circuit Protection	YES		functional	Direct short at output	Amplifier should resume operation after short
						circuit condition removal
					@1/8 max unclipped Power at 1.06	Temperature rise in accessible metal parts
	Thermal Protection	YES		functional		should not exceed 35K rise for domestic version
					times the input voltage	or 30K rise for European versions (refer to
						requirements sheet).
						Design must insure no Offset at the speaker
	DC Offset Protection	YES		-	DC present at Speaker Out leads	output under any operating condition including
						abnormal operation
	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	Type-T or Slo Blo-250 V, Low	Internal fuse with UL/SEMKO rated holder
					Breaking capacity
	4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.
	5.- EURPOEAN VERSION MUST BE PROVIDED WITH PLASTIC PLUGS ON				THE BINDING POST CONNECTORS

5

PS-10/PS-12

CONTROLS AND CONNECTIONS

Rear Panel

•	¡
LEVEL
Green: On
Red: Stand-By	Min	Max

LFE NORMAL ™

	PHASE 0º	180º£
	80Hz
CROSSOVER		¢
FREQUENCY
	50Hz	150Hz
	L ∞ R
LINE LEVEL IN
	For LFE use L or R
		L
§		HIGH
		LEVEL
		IN
+	–	R
ON	OFF ¶	120V
POWER		60Hz

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL	NRTL/C
	CSA 22.2
SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.	UL1492

AVERTISSEMENT: POUR PRÉVENIR LES RISQUES D'INCENDIE OU DE CHOC ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA PLUIE OU A L'HUMIDITÉ.

PS-10/PS-12

¡ Subwoofer-Level Control

™ LFE/Normal Selector

£ Phase Switch

¢ Crossover Adjustment

∞ Line-Level/LFE Input

§ Speaker-Level Inputs

¶ Power Switch

• Status LED

6

PS-10/PS-12

SYSTEM CONNECTIONS

If you have a Dolby* Digital or DTS® receiver/processor with a low-frequency-effects (LFE) or subwoofer output:

Set LFE/Normal switch to “LFE.”

SUBWOOFER OR

LFE OUTPUT

LEVEL

Green: On	Min	Max
Red: Stand-By
	LFE	NORMAL
	PHASE 0º	180º
	80Hz
CROSSOVER
FREQUENCY
	50Hz	150Hz
	L	R
LINE LEVEL IN
	For LFE use L or R

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:

RECEIVER/AMPLIFIER

Front Speaker Output

LEVEL

Green: On
Red: Stand-By	Min	Max

LFE NORMAL

PHASE 0º 180º 80Hz

CROSSOVER

FREQUENCY

50Hz150Hz

L R

LINE LEVEL IN

For LFE use L or R

L

HIGH

LEVEL

IN

R

+–

If your receiver/processor does not contain a Dolby Digital or DTS processor but has subwoofer outputs:

RECEIVER/PROCESSOR

L R

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.

LEVEL

Green: On	Min	Max
Red: Stand-By
	LFE	NORMAL
	PHASE 0º	180º
	80Hz
CROSSOVER
FREQUENCY
	50Hz	150Hz
	L	R
LINE LEVEL IN
	For LFE use L or R
		L
		HIGH
		LEVEL
		IN

R

+ –

RED = +

BLACK = –

1.LOOSEN TERMINALS

2.INSERT BARE END; TIGHTEN TERMINALS

NO STRIPE = –

STRIPE = +

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

PS-10/PS-12

7

PS-10/PS-12

OPERATION

Power On

Plug your subwoofer’s AC 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

Crossover Adjustment

The Crossover Adjustment Control ¢ determines the highest frequency at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce some 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 Crossover Adjustment control to a higher setting, between 120Hz and 150Hz.

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 approximately 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 connectors on 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.

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 SERVICE

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.

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˚. Proper 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.

PS-10/PS-12

8

PS-10 BLOCK DIAGRAM

PS-10/PS-12

9