Infinity 12 Service manual

Cascade Series

Model Twelve Subwoofer

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev1 8/2006

Model Twelve Cascade

- CONTENTS -

BASIC SPECI FICATIONS ………………………………….………..1

DETAILED SPECIF ICATIONS............................................…………2

PACKAGING ……………………………………………………………..4 CONTROLS AND CONNECTIONS………………………………..…..5 OPERATION….…………………………………………………………..7 EXPLODED VIEW………………………………………….……..…..…8

TEST SET UP AND PROCEDURE............................................……9

BLOCK DIAGRAM…………………………………………………..…..10 TROUBLESHOOTING FLOW CHART…………………..………..….11 ELECTRICAL PARTS LIST (120v) …………….………………….….12 PCB DRAWINGS……………….………………….……………………18 SEMICONDUCTOR PINOUTS……………….….……..……….……..22

SCHEMATICS (120v)……………………………....………..………...23

Basic Specifications Cascade Model Twelve P o wered Subwoofer

Frequency Response 32Hz – 150Hz (–3dB)

28Hz – 150Hz (–6dB) Maximum Amplifier Output 300 watts RMS (20Hz – 150Hz, no more than 0.1% THD) Crossover Frequencies 50Hz – 150Hz, continuously variable or LFE Drivers 10" (250mm) MMD®,

Dual 10" (250mm) MMD passive ra diators Dimensions (H x W x D) 20" x 15 " x 13-7/8" (508mm x 381mm x 352mm)

Weight 42 lb (19kg)

Infinit y cont inually strives to update and im pr ove existing products, as well as cr eate new ones. The specifications and construction detail s i n this and related Infinity publ ications are therefore subject to change without notice.

)

Model Twelve Cascade

Cascade Model Twelve subwoofer 300 W Powered Sub/ Plate Amp

LINE VOLTAGE Yes/N

Parameter Specification Unit Amp Sectio

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 0.5 % 22k filter, 50Hz DC Offset undefined mV-DC < 20 @ Speaker Outputs Damping factor 20 N/A > 15 measured at 50 Hz

Input Sensitivit

Signal to Nois

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 Impedanc

Active Filter Low Pass (fixed or variable

High Pass (HPF

Line Out (BUFFERED

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

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

Line Input 260 mV mVrms 300 W @ 50Hz 1 input driven

Line Input 6.5 k ohms Nominal

VARIABLE --

Frequency 50 - 150 Hz

Slope 24 dB/Octave

Q Butterworth --

FIXED --

Frequency 31 Hz

Slope 12 dB/Octave

Q 1.5 --

STEREO --

Hi/Lo Lin

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

Nom. Uni

QA Test

Limits

Conditions Notes

~ Unity Gain

Note

Friend Circui

Special filte

Switches

Main Power ON/OFF YES --

Rabos ON/OFF YES --

Line/Spkr Input Select Switch NO --

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

Limite

(yes/no

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

Output Level Contro

Volume Control Pot YES -- gain control mounted on amp panel

Input/Output Configuratio

Line In Stereo -- RCA phono jack, gold plated LFE In YES -- Shared with "R" Line In jack Line Outputs (L,R) YES -- Buffered all-pass line level L & R

Frequency 60 Hz notch filter

Slope 6 dB/Octave

Type rocker -- Located on amp plate TV-5

Type mini togle -- Located on amp plate

Type -- --

Type mini togle -- Located on amp plate

Taper (lin/log) log A taper --

@ minimum setting no output

FIXED --

Q 2.5 --

RABOS --

YES compressor and limiter

)

Model Twelve Cascade

QA Test

Parameter Specification Unit

Signal Sensing (ATO

Auto-Turn-On (yes/no) YES -ATO Input Test Frequency 100 Hz ATO Input Threshold 1 mV typ. LPF "On", BOS "Off" ATO Low Pass cutoff 1 kHz 450 ATO-LPF for noise immunity LPF "On", BOS "Off" ATO Turn-on time 2 s 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

Power on Feature

Power on Delay time greater than 2 sec. AC Power Applied Power on LED YES -- Bi-color LED located on front of cabinet

Normal On/Off green / red color ATO mode only

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

Transients/Pop

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

Limits

Conditions Notes

Efficienc

Stand-by Input Power 10 Watts AC Power Cons.@1W 12 Watts Power Cons.@rated power 473 Watts Efficiency 63 %

Protectio

Short Circuit Protection YES -- Direct short at output Thermal Protection YES -- threshold ~ 65 deg. C at panel DC Offset Protection YES -Line Fuse Rating ( 120 V ) 3.15 Amps Type ADL or MDL Fuse holder on inside surface of amp panel

typ. typ. typ. typ.

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

DC present at Speaker Out leads Relay for driver/fire protection

Model Twelve Cascade

Line In

Line Out

150

Max

Level

Crossover

[Hz]

Min

LFE

nput

Phase

ormal

Off

LFE

reen: On

Red: Standby

Model Twelve

Power

Model Twelve Cascade

CONTROLS AND CONNECTIONS

Rear Panel

Power Switch

™

Line-Level Outputs

Line-Level Inputs

Power Indicator

∞

Crossover Adjustment

Subwoofer Level (Volume) Control

Normal/LFE Selector

•

Phase Switch

Bass Optimization Controls (see page 5)

Bass Optimization System Selector

‚

Center-Frequency Adjustment

⁄

Bass Optimization System Level Adjustment

Bass Optimization System Bandwidth Adjustment

Cascade Model Twelve

SUBWOOFER OR L

FE OUTPUT

Line In

Line Out

150

Max

Level

rossover

[Hz]

Min

LFE Input

hase

ormal

LFE

reen:On

Red:Standby

Model Twelve

ine In

ine Out

150

Max

Level

rossover

[

Hz]

Min

Input

hase

Normal

LFE

Green:On Red:Standby

odel Twelve

SUBWOOFER OR LFE OUTPUT

ine In

Line Out

LFE Input

reen:On

ed: Standby

Model Twelve

ine In

Line Out

LFE Input

reen:On

ed: Standby

Model Twelve

Line In

Line Out

Input

Green:On Red: Standby

Model Twelve

Line In

Line Out

Input

Green:On Red: Standby

Model Twelve

Model Twelve Cascade

CONNECTIONS

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

• Set Normal/LFE Switch to LFE.

NOTE: In this case, you do not need to use a Y connector.Simply connect the LFE output on your receiver/processor to either the left or right input on the subwoofer.

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

• Set Normal/LFE Switch to Normal.

NOTE: Some receivers have a single subwoofer output (do not confuse this with a single LFE output as described to the left). In that case, it is recommended that you use a Y connector (not included) to maximize performance.

The Cascade Model Twelve also includes a set of line outputs.These outputs allow you to “daisy-chain” one Model Twelve to multiple Model Twelve subwoofers.Simply connect the first subwoofer as described above and then run a subwoofer cable from the line output(s) to the line input(s) on the next sub.

NOTE:This line output is before the R.A.B.O.S.circuit. Each subwoofer’s R.A.B.O.S.controls must be individually adjusted during the R.A.B.O.S.setup.

Cascade Model Twelve

Model Twelve Cascade

OPERATION

Power On

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

to the

on the

Initially set the Subwoofer Level (Volume) Control “min”position.

Turn on your sub by pressing the Power Switch rear panel.

Auto On/Standby

With the Power Switch ¡in the ON position, the Power Indicator LED ¢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

Switch for extended periods of nonoperation,e.g., when you are away on vacation.

can be left on.You may turn off the Power Switch

Adjust Gain

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

(Volume) Control 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.

about half way.If no sound emanates from

Crossover Adjustments

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

¶ is set to “LFE.”If you have a Dolby Digital or DTS

Switch processor/receiver,the Crossover Frequency is set by the processor/receiver.Consult your owner’s manual to learn how to view or change this setting.

∞

The Crossover Adjustment Control 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.

determines the highest

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.

Set the overall volume control of the preamplifier or stereo to a comfortable level. Adjust the Subwoofer Level (Volume) 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.

Cascade Model Twelve

Model Twelve Cascade

Cascade Model Twelve TEST PROCEDURE

The operation of t he Cascade Model Twelve 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# 406-000-05338-E. For service pur poses, 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 t he R.A.B.O.S. On/Off switch is OFF. The only other control of conc er n is the M ain Level Control on the front panel, which operates like a traditional potentiometer.

Equipment needed:

• Function/signal generator/sweep generator

• Integrated Amplifier

• Multimeter

• RCA cables; Speaker cables

General Unit Function (UUT = Unit Under Test) Switch/Controls:

MAIN LEVEL control full Counterclockwise (Min) CROSSOVER (Hz) Full Clockwise (150 ) R.A.B.O.S. On/ Off switch OFF PHASE switch - either position (3) R.A.B.O. S. co ntr ol s – do no t mat ter

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

2) Turn on gener ator ; adjus t to 150mV, 50 Hz.

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

4) LED should be ON (faceplate). Turn up LEVEL control to full Clockwise (Max).

5) LED should be Gre en ; Bass res p onse s ho uld be heard and felt from wo o fer at bo ttom of cabinet.

6) Turn LEVEL control full Counterclockwise (Min). Turn power switch OFF.

Sweep Function

1) Follow steps 1-5 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. Check DC resistance of woofer; it should be 3.4Ω ±10%,

2) 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.

3) Sweep gener a tor fr om 20H z to 1k Hz . Li sten to driver for any rubbin g, buzzing, or other unusual noises.

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