Infinity Intermezzo 4.1t Manuel utilisateur

INTERMEZZO 4.1t

POWERED LOUDSPEAKER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 REV 45/2005

- CONTENTS -

SPECIFICATIONS . . . . . . ……………………….………………………. . . .3

DETAILED SPECIFICATIONS . . …………………………………. . . . . . . .4

CONTROLS and CONNECTIONS . . . …………….……………..…….. . .. 6

OPERATION . . . …………………………………….…………………….. . .10

IM 4.1t ADJUST BIAS PROCEDURE…..…………………………………. .11

TEST SETUP and PROCEDURE…………………………………….. . . . .12

MECHANICAL PARTS LIST ……………………….…………………….….13

EXPLODED VIEW . . . . . . . . . . . .. …………………………..…. . . .. . . . .14

EXPLODED VIEW OF AMPLIFIER . . . . ……………………………. . . . .15

PACKAGING PARTS LIST . . . . …………………………………..…... . . .16

PACKAGING . . . . …………………………………………………..…. . . . .17

SERVICE BULLETIN INF2003-03. . . . . . .. . . . . . . . . ……….. … .. . . . .18

SERVICE BULLETIN INF2001-04. . . . . . .. . . . . . . . . ……….. … .. . . . .20

PRINTED CIRCUIT BOARD DIAGRAMS . . . . .. . . . . . . ………….. . . . .22

ELECTRICAL PARTS LIST . . . . . . . . ……………………………… . . . . .27

PASSIVE NETWORK SCHEMATIC . . . . . . . .. . . . . . . . . …….. . .. . . . .36

SCHEMATICS . . . . . . . . . . . . …………………………………………. . . .37

INTERMEZZO 4.1t

Intermezzo 4.1t Specifications

Frequency Response: 23Hz – 22kHz (±3dB)

30Hz – 20kHz (±1.5dB)

Impedance: 6 ohms

Sensitivity: 87dB (1 watt @ 1 meter)

Max Amp Power: 500 watts*

Subwoofer Amp Output: 850 watts RMS; 2600 watts peak

(with 0.1% THD or less)

2nd- and 3rd-Order <1% (20Hz – 20kHz @ 95dB SPL)

Harmonic Distortion:

Crossover Frequencies: 80Hz, 500Hz, 2800Hz – 24dB/Octave

Dimensions: 51-1/2" x 12-1/2" x 27-1/8"

(1308mm x 318mm x 689mm)

Weight: 93 lb/42.3kg (each)

*The maximum recommended amplifier power rating will ensure proper system headroom to allow for

occasional peaks.We do not recommend sustained operation at these maximum power levels.

Infinity continually strives to update and improve existing products, as well as create new ones.The

specifications and details in this manual and related Infinity publications are therefore subject to

change without notice.

INTERMEZZO 4.1t

Detailed Specifications

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) AB --- HC-BASH Power Supply

Load Impedance (speaker) 8 Ohms Nominal Resistor Load

Rated Output Power 1000 Watts 850 @ 30Hz, THD 15%, Limiter defeated

THD@ 680W 1 % 5 22k filter, 30Hz, LPF “Off”

THD @ 1 Watt 0.05 % 0.3 22k filter, 30Hz, LPF “Off”

Polarity (Input vs Output) 0 deg. 0°±20 @ 30Hz; LPF “Off”.250 faston (+)……205 faston (-)

DC Offset 1 mV-DC 1.5 @ Speaker Outputs

Damping factor > 50 DF

Input Sensitivity

Input Frequency 30 Hz 30 Nominal Freq. 1 input driven

Line Input 43 dBr ±2 STO 1 Watt, @30Hz LPF “Off,”Gain Max.

Speaker/Hi-Level Input 14.5 dBr ±2 STO 1 Watt, @30Hz LPF “Off,”Gain Max.

Signal to Noise

SNR-A-Weighted 100 dBA 90 relative to 680W output A-Weighting filter

SNR-unweighted 90 dBr 80 relative to 680W output 22k filter

SNR rel. 1W-unweighted 60 dBr 50 relative to 1W output 22k filter

Residual Noise Floor 2 mVrms 3 Volume @max, using RMS reading DMM/VOM (or A/P)

Residual Noise Floor 1 mVrms (max) 3 Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics)

Input Impedance

Line Input 10k ohms Nominal

Speaker/Hi-Level Input 1k ohms Nominal

Active Filters

Low-Pass (fixed or variable) fixed --

Frequency 80 Hz

Slope 24 dB/Octave

Q 0.7 Damping

Low-Pass (fixed or variable) fixed --

Frequency 24 Hz 10k-ohm resistor added in series with

Slope 6 dB/Octave feedback cap. for shelving effect.

Q 0.7 Damping

Subsonic Filter (HPF) fixed --

Frequency 12 Hz

Slope 12 dB/Octave

Q 0.7 Damping

Line-Out Filter (HPF) fixed -- nonswitchable Low level output to satellites

Frequency 80 Hz

Slope 12 dB/Octave

Q 0.7 Damping

High-Level Out Filter (HPF) no --

Parametric EQ (BOS)

Frequency Pot yes -- 21 detent pot (0.1 oct. steps)

Range 20 –80 Hz functional

Level Pot yes -- -- 21 detent pot (0.5dB steps)

Range 0 to –14 dB functional

Width (Q) Pot yes -- -- 21 detent pot (5 steps/0.1 octave)

Range 0.05 –0.5 octave functional

INTERMEZZO 4.1t

Detailed Specifications (cont.)

Features

Main Power On/Off Switch rocker -- functional Locate at amp plate

High-Level High-Pass Switch push button -- functional Locate at amp plate Single pole, rated 10A @120V/240V,

or more

Low-Pass Filter Switch 3-pos switch -- functional Locate at amp plate

R.A.B.O.S.™Bypass Switch mini DC jack functional Locate at amp plate O.D.: 5.0mm; I.D.: 2.1mm

Limiter (yes/no) yes

Output Power Limited to 680 Watts 650 THD < 5%

Output Volume Control

Volume Control Pot 10k ohm Locate at front, illuminated

Taper (Lin/Log) A-/C-taper -- D-shaft pot for knob fitting A-taper for “left”; C-taper for “right”

@Minimum Setting no output dB

Input/Output Configuration

Line-In (L, C, R, AC3, Mono) mono -- RCA phono jack, gold-plated

Spkr/Hi-Level In (L, C, R, mono) mono -- Binding posts, gold-plated

Line Outputs (L, C, R) mono -- RCA phono jack, gold-plated High pass filtered, 2nd order

Signal Sensing (ATO)

Auto-Turn-On (Yes/No) yes -- Under the condition that bias power never exceed 15W

ATO Input Frequency 30 Hz

ATO Level 8/100 mV 15/120 @30Hz into single Line/Speaker Input LPF “On,”BOS “Off”

ATO Bandwidth 300 Hz 350 ATO-LPF for noise immunity LPF “On,”BOS “Off”

ATO Turn-On Time 5 ms 10 Amp connected and AC on, then input signal applied

Auto Mute/ Turn-Off Time 15 minutes 20 Time before muting, after signal is removed

Power on Features

Power on Delay Time 2 sec. 3 AC Power Applied

Power on LED yes -- Bi-color LED located at front

Normal On green color

ATO red color “Active”: green; “Standby”: red

Transients/Pops

ATO Transient 10 mV-peak N/P @ Speaker Outputs

Turn-On Transient 100 mV-peak 1V-pp @ Speaker Outputs AC Line cycled from OFF to ON

Turn-Off Transient 100 mV-peak 1V-pp @ Speaker Outputs AC Line cycled from ON to OFF

Efficiency

Standby Input Power 1.5 Watts 3 @ nom. line voltage LED “red”

AC Power Cons.@ 1W 36 Watts 40 @ nom. line voltage

Power Cons.@ 680W 955 Watts 1000 @ nom. line voltage

Efficiency @ 680W 72 % 68

Protection

Short Circuit Protection preferred -- functional Direct short at output Compliance to HCG Reliability

Test Plan

Thermal Protection preferred -- functional @1/8 max unclipped Power Compliance to HCG Reliability

Test Plan

DC Offset Protection preferred -- functional DC present at Speaker Out leads Compliance to HCG Reliability

Test Plan

ESD Protection preferred -- functional ESD 15kV test apply to all Compliance to HCG Reliability

input terminals Test Plan

Line Fuse Rating 6 Amps Type-T or Slo Blo External fuse with UL/SEMKO

rated holder

INTERMEZZO 4.1t

Speaker-Level Input

Low-Level-Input Connector

Low-Level-Output Connector

Bass-Mode Switch

High-Pass Filter Switch

AC-Cord Input

Power Switch

 Subwoofer-Level Control

R.A.B.O.S. Controls

Center-Frequency Adjustment

R.A.B.O.S. Level

Bandwidth Adjustment















120V – 60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

– +

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t









›

Rear Panel Front Panel

Controls and Connections

INTERMEZZO 4.1t

The Infinity Intermezzo 4.1t offers unprecedented

flexibility for connecting the system to any type of

audio or home theater system. Consult the table at

right to determine which system description most

closely matches your own, then follow the hookup

method corresponding to that system.

If none of these system configurations seem to

match yours, consult your dealer or Infinity customer

service for direction on how best to hook up your

system.

For Methods 2, 3a, 3b and 4, make sure all bass-

management features are properly set. The Audio

channels should all be set to “Small”or “High-

Pass”and the subwoofer set to “On.”

120V –60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

–+

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t

AMPLIFIER/RECEIVER

SPEAKER

OUTPUTS

(ONE CHANNEL SHOWN)

––

LOOSEN TERMINALS

INSERT BARE END;

TIGHTEN TERMINALS

SET BASS MODE



TO POSITION 3

SET HIGH-PASS SWITCH



TO ON

BLACK =

–

NO STRIPE =

–

STRIPE =

RED =

120V –60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

–+

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t

PREAMP OUTPUTS

(ONE CHANNEL SHOWN)

AMPLIFIER INPUTS

BLACK = –

STRIPE = +

RED = +

NO STRIPE = –

LOOSEN TERMINALS

INSERT BARE END;

TIGHTEN TERMINALS

SET BASS MODE



TO POSITION 2

SET HIGH-PASS SWITCH



TO OFF

AMPLIFIER/RECEIVER

SPEAKER OUTPUTS

SPEAKER

OUTPUTS

LEFT RIGHT

–– ++

2-Channel receiver or integrated amplifier

that has no subwoofer output or

Pre-Out/Main-In connectors 1

2-Channel receiver or integrated amplifier

with preamp output and input connectors 2

2-Channel system with separate preamplifier

and power amplifier 2

Dolby Pro Logic®with THX, Dolby Digital,

or DTS®receiver with a filtered subwoofer

(or LFE) output connector 3a

Dolby®Digital or DTS processor with separate

power amplifiers or multichannel amplifier 3b

Non-THX®-certified Dolby Pro Logic receiver

with full-range subwoofer outputs 4

System Type Connection Methods

Method 1

Method 2

Controls and Connections (cont.)

INTERMEZZO 4.1t

120V –60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

–+

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t

SURROUND RECEIVER

SUBWOOFER (LFE)

OUTPUT

TO SECOND 4.1t Y-Connector

BLACK =

–

NO STRIPE =

–

STRIPE =

RED =

LOOSEN TERMINALS

INSERT BARE END;

TIGHTEN TERMINALS

SET BASS MODE



TO POSITION 1

SET HIGH-PASS SWITCH



TO OFF

(ONE CHANNEL SHOWN)

–+

FRONT SPEAKER

OUTPUTS

120V –60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

–+

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t

AMPLIFIER PROCESSOR

SUBWOOFER (LFE)

OUTPUT

TO SECOND 4.1t

SPEAKER

OUTPUT INPUT

–+

FRONT CHANNEL

OUTPUT

(ONE CHANNEL SHOWN)

LOOSEN TERMINALS

INSERT BARE END;

TIGHTEN TERMINALS

SET BASS MODE



TO POSITION 1

SET HIGH-PASS SWITCH



TO OFF

BLACK = –

NO STRIPE = –STRIPE = +

RED = +

Y-Connector

Method 3a

Method 3b

Controls and Connections (cont.)

INTERMEZZO 4.1t

120V –60HZ 6A

INPUTS

POWER

HIGH-PASS

FILTER

BASS

MODE

AC FUSE

6A 250V

OFF

–+

LOW-

LEVEL

INPUT

LOW-

LEVEL

OUTPUT

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

INTERMEZZO 4.1t

RECEIVER

SUBWOOFER

OUTPUTS

SPEAKER

OUTPUTS

RIGHT

(ONE CHANNEL SHOWN)

–+

BLACK = –

NO STRIPE = –STRIPE = +

RED = +

LOOSEN TERMINAL

INSERT BARE

END;TIGHTEN

TERMINAL

SET BASS MODE



TO POSITION 2

SET HIGH-PASS SWITCH



TO ON

Method 4

Final Positioning

After correctly connecting the Intermezzo 4.1t and

verifying that both the subwoofer and main section

portions are playing, it is time to optimize the

system for your particular listening room.

Earlier, you placed the loudspeakers in their

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 until your speakers deliver their full

potential.When the speakers are moved inward

(toward each other) there is generally better focus

of instruments and vocalists; however, moving the

speakers too close together can reduce the

spaciousness of the stage effect and you may

need to experiment with the trade-off between

focus and imaging. If your listening room is larger

than average and your listening position is

relatively far from the speakers, wider placement of

the speakers may be required.

Controls and Connections (cont.)

Operation

INTERMEZZO 4.1t

The operation of the Intermezzo 4.1t loudspeaker system, 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# 336205-001.

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.

Position of the Bass Mode switch, for simple testing purposes:

Using the high-level (Speaker) inputs, switch should be in position 3.

Using the line-level (RCA) inputs, switch should be in position 1.

The only other control of concern is the Main Level Control on the front

panel, which operates like a traditional potentiometer.

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