Infinity PS-8 Service manual

PS-8

PS Series

SERVICE MANUAL

Infinity Systems Incorporated

250 Crossways Park Dr.

Woodbury, New York 11797 Rev2 10/2006

PS-8

CONTENTS

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

DETAILED SPECIFICATIONS . . . . . . . . . . . . . . . . . …….…. . .. .. .. . . . . . 2

CONTROLS & CONNECTIONS . . . . . . . . . . . …………….……………. . . . 3

OPERATION……. . . . . .. . . . . . . . .. .. . . …………………………... . . . . . . . 5

UNIT EXPLODED VIEW. . . . ………………………………….………….... . … . 6

AMPLIFIER EXPLODED VIEW. . . . …………………………….……….... . … . 7

BLOCK DIAGRAM .. . . . . . . . . . . . . . .. . . . . ………….……………….. . . . . . 8

PS-8 TEST SET UP AND PROCEDURE . . . . . . ……….…………………. . 9

ELECTRICAL PARTS LIST …………. .... . .. . . …………………………. . . . 10

PCB DRAWINGS (serial # ME0683-16316 and below)……………….. . . . . . 13

PCB DRAWINGS (serial # ME0683-16317 and above) .. .. ………….. . . . . . 15

IC – TRAN S I STOR PINO UTS ………………………………………………... . 17

SCHEMA TIC DIA GR AM S (serial # ME0683-16316 and below)……….…. . . .18

SCHEMA TIC DIA GRA M S (serial # ME0683-16317 and above). . . .. ….…. . .20

SCHEMATIC DIAGRAMS (Rev 2) . . . . . . ……….………………….………. . 22

PACKAGE………... ………………………………………………………….…. .25

PS-8 SPECIFICATIONS

Frequency Response: 35Hz – 150Hz (±3dB) Maximum Amplifier Output: 100 watts RMS (20Hz – 150Hz with no more than 0.1% THD) Crossover Frequencies: 50Hz – 150Hz, 24dB/octave, continuously variable Driver: 8" (203mm) MMD™ DCR = 4.3Ω Dimensions 17-1/2" x 10-5/8" x 16-3/4" (H x W x D)

(445mm x 270mm x 426mm)

Weight: 33 lb (15kg)

Infinit y cont inually stri ves to update and improve existing products, as well as create new ones. The specificati ons and construction detail s i n this and related Infini t y publ ications are therefore subject to change without notice.

PS-8

INFINITY PRIMUS PS-8 100W Powered Sub/ Plate Amp

LINE VOLTAGE Yes/No Hi/Lo Line Unit Notes

Europe 220-240VAC, 50-60Hz Yes 220-240 Vrms Normal Operation

Paramete Amp Section

Type (Class AB, D, other) AB AB n/a Load Impedance (speaker) 4 Ohms n/a Nominal Rated Output Power 100 Watts 95 Single input driven THD@ Rated Power 0.5 % 1 22K filter THD @ 1 Watt 0.1 % 0.5 22K filter DC Offset 10 mV-DC 50 @ Speaker Output Damping factor >100 DF 50 Measured at speaker terminals Output power 90 Watts THD 0.1 %

Input Sensitivity

Signal to Noise

SNR-A-Weighted 100 dBA 85 rel. to rated power A-Weighting filter SNR-unweighted 80 dBr 80 rel. to rated power 22K filter SNR @ 1W-unweighted 60 dBr 60 rel. to 1W Output 22K filter Residual Noise Floor 1.5 mVrms 2.5 Volume @max, using RMS reading

Residual Noise Floor 1

Input Impedance

Filters

Low Pass (fixed or variable) Variable -- ±2dB Subsonic filter (HPF) Hz ±2dB

Limite

Features

LFE Input, Phase Switch, ATO YES functional Volume pot Taper (lin/log) LOG -- functional

Input Configuration

Line In (L,R) L ,R -- functional RCA inputs: L , R Summed to Mono Line level in LFE LFE functional Spkr/Hi Level In

Spkr Out: Level out (L,R)Hi Pass Filter

120 VAC Version NO 230 VAC Version YES functional This feature exists in 230VAC Model Direct by pass from Speaker in

Signal Sensing (ATO)

Auto-Turn-On (yes/no) YES -- functional

ATO Input Frequency 50 Hz functional ATO Level 2 mV functional 2mV@50Hz into Line Input w/ 1 ch. driven ATO Level Speaker in 35 mV functional 35mV @ 50 Hz into the speaker input, single input driven. ATO Turn-on time 5 ms functional Amp connected and AC on, then input signal applied Auto Mute/ Turn-OFF Time 10 minutes functional T before muting, after signal removed Auto turn of time (T) must be 5 > T <15

Power on Delay time 3 sec. functional AC Power Applied

Transients/Pops

ATO Transient 5 mV-peak 10 @ Speaker Outputs Turn-on Transient 50 mV-peak 100 @ Speaker Outputs AC Line cycled from OFF to ON Turn-off Transient 50 mV-peak 100 @ Speaker Outputs AC Line cycled from ON to OFF

Efficiency

Stand-by Input Power 12 Watts 15 @ nom. line voltage Power Cons.@rated power 195 Watts 210 @ nom. line voltage 100 Watts @ 4 Ohms

Protection

Short Circuit Protection YES -- functional Direct short at output

Thermal Protection 65 deg. C -- functional @1/8 max unclipped Power DC Offset Protection YES -- functional DC present at Speaker Out leads Relay or crowbar (for driver/fire protection)

Line Fuse Rating

120 VAC 2.5 Amps Type-T or Slo Blo 230 VAC 1.25 Amps Type-T, Low breaking capacity

ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.

US 120VAC/60Hz Yes 108-132 Vrms Normal Operation

Specification Unit QA Test Limit

Input Frequency 50 Hz 50 Nominal Freq.

Line Input (L&R) 171 mVrms ±2dB To Rated Power Single input driven, AP Zo=600 Ohms

Speaker/Hi Level Input 2.4 Vrms ±2dB To Rated Power Single input driven

Line input L&R , LFE >10 K ohms n/a Nominal

Speaker/Hi Level Input 4.7 K ohms n/a Nominal

(yes/no) NO -- n/a

LFE Input 117 mVrms ±2dB To Rated Power LFE input driven only, AP Zo=600 Ohms

mVrms(max) 2

(L,R) L,R -- functional L R Summed to Mono

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

120VAC version is not provided with Spkr. Output connectors

Conditions Notes

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

Temperature rise should not exceed 35K rise

External fuse with UL/SEMKO rated holder

PS-8

Rear Panel

CONTROLS AND CONNECTIONS

Subwoofer-Level Control

™

Crossover Adjustment

Phase Switch

LFE Input

∞

Line-Level Inputs

High-Level Inputs

Power Switch

PS-8

™

HIGH LEVEL INPUT

–

L R

∞

FUSE

T 2.5A L 250V

TYPE

~ 120V 60HZ

200 Watts

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-8

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

SUBWOOFER OR LFE OUTPUT

+ +

OUT IN

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

NOTE:

Some receivers have one subwoofer output. In that case,it is recommended that you use a Y connector (not included) to maximize performance.

+ +

OUT IN

RECEIVER/PROCESSOR

L R

SUBWOOFER CONNECTIONS

CHOOSE THE SUBWOOFER CONNECTION THAT IS MOST SUITABLE FOR YOUR RECEIVER/PROCESSOR

LOOSEN TERMINALS INSERT BARE END;

TIGHTEN TERMINALS

BLACK =

–

NO STRIPE = –STRIPE =

RED =

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

RECEIVER/AMPLIFIER

Front Speaker Output

–

HIGH LEVEL INPUT

L R

PS-8

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

the rear panel. Turn on your entire audio system and start a CD or movie

sound-track at a moderate level.

Auto On/Standby

With the Power Switch ¶in the ON position,the LED on the front 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 Level

Turn your Subwoofer-Level Control ¡up to the “5”position (halfway).If no sound emanates from the subwoofer,check the ACline 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,e xtending 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 piston-like 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.

Crossover Adjustments

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.

NOTE:This control will have no effect if the LFE Input

¢ is used. 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.

PS-8

Ref# Description Part Number Qty

1 Grille 244-080-0025 1 2 Screw (Trim Ring) 352-DM04525D597 6 3 Woofer Trim Ring 213-080-00488 1 4 Screw (Woofer) 352-FM04014D609 8

5 8” Woofer 20PR10DAG-FW04 1

6 PS-8 Cabinet Not for sale 1 7 PS-8 Amplifier Not for sale 1 8 Screw (Amplifier) 352-AM04020D210 10

9 Port Tube 249-HIPS-01003 2 10 Foot Pad 320-RUB-00199 4 11 Screw (Foot) 352-CM04025D604 4 12 Feet (Main) 320-ABS-00195 4 13 Logo 316-ABS-00532 1

PS-8

PS-8 AMPLIFIER EXPLODED VIEW

+ 18 hidden pages