Infinity MSW-2 Service manual

MSW-II Subwoofer

MODULUS® II HOME THEATER SYSTEM

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev

210/2005

MSW-II

- CONTENTS -

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

DETAILED MSW-II SPECIFICATIONS ……………………………………….…..2

CONTROLS AND CONNECTIONS…………………………………….…..………..4

OPERATION….……………………………………………………………………..….6

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

EXTERNAL/MECHANICAL PARTS LIST …………….………………....……8

MSW-II TEST PROCEDURE………………………………………..………………..9

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

PCB DRAWINGS……………….…………..…………………………………..….…15

SEMICONDUCTOR PINOUTS……………………………………………….……..17

SCHEMATICS ……………………………………………………………………...18

MODULUS II PACKING………………………………………………………………30

Basic Specifications Modulus MSW-II Powered Subwoofer

Frequency Range: 27Hz – 100Hz (±3dB)

Amplifier Output: 300 watts RMS, 600 watts peak

Low-Frequency Driver: 12" C.M.M.D.,magnetically shielded

Crossover Frequency: 100 Hz (12 dB per octave)

Dimensions (H x W x D): 16-1/2" x 14-1/2" x 18-1/8"

(419mm x 368mm x 460mm)

Weight: 44 lb (20 kg)

Infinity continually strives to update and improv e 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.

MSW-II

Modulus subwoofer MSW- II 300W Powered Sub/ Plate Amp

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

Parameter Specification Unit Amp Section

Type (Class AB, D, other) D --Load Impedance (speaker) 4 Ohms Nominal Z-curve required Rated Output Power 300 Watts Regulated 120 V line THD@ Rated Power 1 % 22k filter, 50Hz 300W THD @ 1 Watt 0.2 % 22k filter, 50Hz DC Offset undefined mV-DC < 20 @ Speaker Outputs Damping factor 20 N/A > 15 measured at 50 Hz

Input Sensitivity

Signal to Noise

SNR-A-Weighted 100 dBA relative to rated power A-Weighting filter SNR-unweighted 70 dBr relative to rated power 22k filter SNR rel. 1W-unweighted 60 dBr relative to 1W Output 22k filter Residual Noise Floor 2 mVrms Volume @max, using RMS reading DMM/VOM (or A/P) Residual Noise Floor 1

Input Impedance

Active Filters Low Pass (fixed or variable) FIXED --

Subsonic filter (HPF) fixed --

Friend Circuit FIXED --

Special filter RABOS --

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

EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required

QA Test

Limits Conditions Notes

Line/Hi Level Input Phase N/A

Line Input 400 mVrms 300 W @ 50Hz 1 input driven

mVrms(max)

Line Input 5 k ohms Nominal

Frequency 100 Hz

Slope 24 dB/Octave

Q Butterworth Damping

Frequency 20 - 35 Hz

Slope 12 dB/Octave

Q 0.5 - 2.5 Damping

Frequency 62.7 Hz Hz notch filter

Slope 12 dB/Octave

Q 2.5 Damping

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

Switches

Main Power On/Off Switch YES --

RABOS on/off

Polarity Switch YES -- "Off": 0°; "On": 180°

Low Pass on/off YES

Limite

(yes/no) YES compressor and limiter

THD at Max. Output Power less than 2 % Maximum Output Power Maximum THD as a result of limiting.

Output Volume Control

Volume Control Pot YES -- harness for pot and LED to be remotely mounted

@ minimum setting no output

Input/Output Configuration

Line In (L,C,R,AC3,Mono) Stereo -- RCA phono jack, gold plated LFE In YES -- Shared with "R" Line In jack Hi Level Out YES --

Signal Sensing (ATO)

Auto-Turn-On (yes/no) YES -ATO Input Test Frequency 100 Hz ATO Input Threshold 2 mV typ. LPF "On", BOS "Off" ATO Low Pass cutoff 400 Hz 450 ATO-LPF for noise immunity LPF "On", BOS "Off" ATO Turn-on time 1 ms 10 Amp connected and AC on, then input signal applied ( 1 W output ) Auto Mute / Turn-OFF Time 10 minutes 5 < t < 15 Time before muting, after signal is removed

Type push-button -- Located on amp plate

YES --

Type mini toggle --

Type mini toggle -- Locate at amp plate

Taper (lin/log) log A taoer --

MSW-II

Power on Features

Power on Delay time greater than 2 sec. AC Power Applied Power on LED YES -- Bi-color LED located adjacent to volume control knob

Transients/Pops

ATO Transient 5 mV-peak @ Speaker Outputs Turn-on Transient 30 mV-peak @ Speaker Outputs AC Line cycled from OFF to ON Turn-off Transient 30 mV-peak @ Speaker Outputs AC Line cycled from ON to OFF

Normal On/Off green / red color ATO mode only

ATO -- color "Active": green; "Standby": red

Efficiency

Stand-by Input Power 12 Watts AC Power Cons.@1W 13 Watts Power Cons.@rated power 375 Watts Efficiency 70 %

Protection

Short Circuit Protection YES -- Direct short at output Thermal Protection YES -- threshold ~ 65 deg. C at panel DC Offset Protection YES -- DC present at Speaker Out lead Relay for driver/fire protection Line Fuse Rating ( 120 V ) 3.15 Amps Type ADL or MDL Panel mount fuse holder

typ. typ. typ. typ.

@ nom. line voltage @ nom. line voltage @ nom. line voltage Input power measured is REAL Watts, not VA @ nom. line voltage

MSW-II

UBWOOFERCONTROLS

Rear Panel

R.A.B.O.S.On/Off Switch

R.A.B.O.S.™

Modulus MSW-II

This unit is designed to become quite warm,

during normal operation.

Freq.

Controls

Width

Level INPUT

™¡

∞

•

FUSE

T5A L/250V

R.A.B.O.S.

PHASE

180°

LOW PASS

LFE

NRTL/C CSA22-2 NO. 1 UL 1492

POWER

AC 120V~60Hz

75 Watts

™

Center-F requency Adjustment

Room Adaptive Bass Optimization System

OFF

0°

OFF

Bandwidth Adjustment

R.A.B.O.S.Level

∞

Phase Switch

Low-Pass Filter Selector

Line-Level Inputs

•

Power Switch

Subwoofer Level Control

(R.A.B.O.S.) Controls

A Few Suggestions

We recommend that you do not operate your speakers or subwoofer with the bass,treble and loudness controls set to full boost. This will place undue strain on your electronics and speakers and could damage them.

The volume control setting on your processor/preamp or receiver is not a specific indication of the overall loudness level of the speakers.The only important consideration is the loudness level at which the system can be played,regardless of where the volume control is set.

Front Panel

Always turn down the volume control setting on your processor/ preamp or receiver when changing a cassette or CD,or switching inputs to AM or FM operation.Excessively loud transients (clicks or popping sounds) can damage the satellite speakers and

possibly the subwoofer.

Important!

Whenever changing cables,pulling plugs,etc.,ALWAYS TURN OFF ALL EQUIPMENT,including the subwoofer.This prevents transients from entering the speakers and prevents electrical energy from reaching you.Keep all connections out of the reach of children.

MODULUS II HOME THEATER SYSTEM

MSW-II

UBWOOFERCONNECTIONS

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

SUBWOOFER OR

LFE OUTPUT

R.A.B.O.S.™

Freq.

Controls

Width

Level INPUT

Modulus MSW-II

This unit is designed to become quite warm,

during normal operation.

™¡

∞

•

FUSE

T5A L/250V

R.A.B.O.S.

PHASE

180°

LOW PASS

LFE

NRTL/C CSA22-2 NO. 1 UL 1492

POWER

AC 120V~60Hz

75 Watts

OFF

0°

OFF

If your receiver/processor has subwoofer outputs for the left and right channels:

RECEIVER/PROCESSOR

R.A.B.O.S.™

Controls

Modulus MSW-II

This unit is designed to become quite warm,

during normal operation.

™¡

Freq.

∞

Width

Level INPUT

•

FUSE

T5A L/250V

R.A.B.O.S.

PHASE

180°

LOW PASS

LFE

NRTL/C CSA22-2 NO. 1 UL 1492

POWER

AC 120V~60Hz

75 Watts

OFF

0°

OFF

• Set Low-Pass Filter

to“Off”.

• Set Low-Pass Filter §to“On.”

MODULUS II HOME THEATER SYSTEM

MSW-II

PERATION

Surround Modes

When using the Modulus II system in a Dolby Pro Logic* home theater system,make sure the receiver’s center channel mode is set to “Normal.”When using the Modulus II system in a Dolby Digital or DTS home theater system,make sure the receiver’s speaker modes are set to “Small.”

Some Dolby Digital-equipped receivers/processors offer different setup options for each source or surround mode:e.g.,CD-stereo, videotape,Dolby,Pro Logic.In each case,follow your equipment’s instructions to ensure that the subwoofer output is turned on and that the speakers are set to “Small”in each mode.

Power On

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

Initially set the subwoofer’s Level Control ª to the “O”position. Turnon your sub with the Power Button •on the rear panel.

AutoOn/Standby

With the Power Button •in the ON position,the Level Control ª on the front panel will remain backlit 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 Button can be left on.You may turn off the Power Button •during extended periods of nonoperation:e.g., when you are away on vacation.

•

Set the overall volume control of the preamplifier or stereo to a comfortable level.Adjust the subwoofer’s Level Control ªuntil

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 is 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.

Final Positioning

After correctly connecting the Modulus II system and verifying that both the subwoofer and all satellite speakers are playing,it is time to optimize the system for your particular listening room. Earlier, you placed the subwoofer in its general location.Finding the exact location for optimum performance sometimes only involves moving the speakers up to a few inches in any direction. We urge you,therefore,to experiment with placement, if possible, until your speakers deliver their full potential.

Adjust Level

Turnon your entire audio system and start a CD or movie soundtrack at a moderate level. Turn your subwoofer’s Level Control ª

up to the “5”position (half way). 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 Button •been pressed to the “On”position? (Note:The Level Control front panel will turn green when the power is on.) Once you have confirmed that the subwoofer is active,proceed by playing a sound source.Use a selection that has ample bass information.

ª on the

MODULUS II HOME THEATER SYSTEM

MSW-II

(Refer to page 13 for part numbers)

MSW-II

MSW-II Subwoofer

EXPLODED VIEW

ITEM NO. DESCRIPTION QTY. PART NO.

1. GRILLE (CHARCOAL) 1 244-120-00268-0YA (PLATINUM) 244-120-00268G

2. GRILLE CUP (Charcoal) 4 327-RUB-00112B (Platinum) 327-RUB-00112W

3. WOOFER/AMPLIFIER/BAFFLE 25 352-FM04020D605 SCREWS

4. FRONT BAFFLE (Charcoal) 1 243-120-00399B (Platinum) 1 243-120-00399W

5. 12" WOOFER C.M.M.D .,SHIELDED, 1 30PR14BW-DW01 DCR = 3.51 ±10%

6. MSW-II SUBWOOFER CABINET 1 Not for Sale (CHARCOAL OR PLATINUM)

ITEM NO. DESCRIPTION QTY. PART NO.

7. AMPLIFIER ASSEMBLY 1 Not for Sale

8. FOOT (Charcoal) 4 320-ABS-00193B (Platinum) 4 320-ABS-00193W

9. FOOT PAD (Charcoal) 4 320-RUB-00192B (Platinum) 4 320-RUB-00192W

10. PORT TUBE 1 249-ABS-00158

11. FOOT SCREW 4 352-HM05025D606

12. WIRING HARNESS (AMP-LEVEL POT)1 165-50400HH4

13. LEVEL CONTROL PCB 1 015-AA000-00113

14. LEVEL CONTROL SCREWS 3 352-CM03509D439

MSW-II Subwoofer

MSW-II

Modulus MSW-II TEST PROCEDURE

The operation of the Modulus MSW-II subwoofer, and the proper settings for the Room Adaptive Bass Optimization System, or R.A.B.O.S., is thoroughly covered in the Owner’s guide, part# 406-000-00921. For service purposes, the R.A.B.O.S. system is canceled when all three front panel controls (F) (L) (W) are turned fully CW (Clockwise), or if the R.A.B.O.S. On/Off switch is OFF. The only other control of concern is the Main Level Control on the front panel, which operates like a traditional potentiometer.

Equipment needed:

x Function/signal generator/sweep generator x Integrated Amplifier x Multimeter x RCA cables; Speaker cables

General Unit Function (UUT = Unit Under Test)

Switch/Controls:

MAIN LEVEL control full clockwise (0) LOW PASS FILTER switch OFF R.A.B.O.S. On/Off switch OFF PHASE button - either position (3) R.A.B.O.S. controls – do not matter

1) From the signal generator, connect one line level (RCA) cable to the Input jacks (L/R) on the UUT. Use a Ycable from a mono source if necessary to connect to both inputs.

2) Turn on generator; adjust to 150mV, 50 Hz.

3) Plug AC power cord in UUT, turn power switch ON.

4) Red LED should ON (in the Level wheel at the front of the UUT). Turn up LEVEL control to full counterclockwise (10).

5) Green LED should ON; Bass response should be heard and felt from port tube opening.

6) Turn LEVEL control full clockwise (0). Turn power switch OFF.

Sweep Function

1) Follow steps 1-3 above, using a sweep generator as a signal source – adjust the generator to 100mV, 50 Hz.

2) Sweep generator from 20Hz to 300Hz. Listen for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, test woofer according to the instructions below.

Driver Function

1) Remove woofer from the enclosure; (see exploded view on page 8).

2) Check DC resistance of woofer; it should be 3.5

±10%,

3) Connect a pair of speaker cables to woofer terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 6.0V.

4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

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