Infinity IL-50-LR Service manual

Interlude Series

IL50 L/R

Powered Loudspeaker

Service Manual

Infinity Systems, Inc

250 Crossways Park Dr.

Woodbury, New York 11797

REV10 10/2005

IL50

CONTENTS

SPECIFICATIONS …….……………………………………………….3 DETAILED SPECIFICATIONS …………………….…………………4 CONTROLS and CONNECTIONS …………………….….…………6 OPERATION……………………………………..………..…….……..10 BASS OPTIMIZATION SYSTEM……………………….….…………10 MECHANICAL PARTS LIST…………………….……………………12 EXPLODED VIEW ……………………………………….……………13 EXPLODED VIEW OF AMPLIFIER…………………….……………14 SERVICE TIPS……………………………..……………………….…15 SERVICE BULLETIN INF2002-02 ……………………..……………16 SERVICE BULLETIN INF2001-04 ……………………..……………17 SERVICE BULLETIN INF2002-05 ……………………..……………19 TECH TIP INFTT2003-03……………………………………………..24 TEST SET UP PROCEDURE…………………….…….……………25 IL50 ADJUST BIAS PROCEDURE……………….…………………26 PACKAGING …………………………….………………………….…27 PRINTED CIRCUIT BOARD DIAGRAMS………………..…………28 ELECTRICAL PARTS LIST (120v)…………………….….…………34 INTEGRATED CIRCUIT DIAGRAMS ………………………………40 HI-PASS CROSSOVER SCHEMATIC…………………………………...41 IL50 SCHEMATICS…………..………….……………………………42

IL50 L/R

Specifications

IL50 L/R Frequency Response: 32Hz - 22,000Hz (±3dB) Recommended Amplifier Power Range 15-150 watts* Subwoofer Amplifier Output: 250 watts (In to 8Ω from 20 Hz - 100Hz

with no more than 0.1% THD)

Sensitivity: 88dB (2.83V @ 1 meter) Nominal Impedance: 8Ω

Crossover Frequencies: 150Hz; 2500Hz, 24dB/octave, Low-Frequency Driver: 10" C.M.M.D., magnetically shielded Mid-Bass Driver: 6-1/2” C.M.M.D., magnetically shielded High-Frequency Driver: 1” C.M.M.D., magnetically shielded Dimensions (H x W x D): 42" x 8-3/4" x 14-1/2"

(1067mm x 222mm x 368mm)

Weight: 60 lb (27kg)

* 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.

Detailed Specifications

IL50 L/R

Detailed Specifications (Cont.)

IL50 L/R

Controls and Connections (Cont.)

IL50 L/R

Controls and Connections

IL50 L/R

Controls and Connections (Cont.)

IL50 L/R

Controls and Connections (Cont.)

IL50 L/R

Operation/Bass Optimization System

IL50 L/R

Bass Optimization System

(Cont.)

NOTE:It is important that you make the same adjustments to both loudspeakers. Set the Bass Optimization System Bandwidth adjustments to a middle position (10 clicks from a

fully clockwise position) and set Level adjustments for a –6dB (8 clicks from a fully clockwise position). Then,while the music is playing,sit in your favorite chair and have somebody else slowly adjust the Frequency controls from fully clockwise to fully counter-clockwise. At a certain frequency, you should hear the problem lessen and the overall bass performance improve. When you are satisfied that you have found the best frequency, have your assistant vary the Levels slowly up and down until you have maximized the improvement.If you have really keen ears, you can also have the Bandwidth controls adjusted for maximum benefit.

While the Bass Optimization System allows the listener to fine-tune the bass response to sound best in a particular room,some listeners don’t have the skill or desire to adjust their system by ear. In order to facilitate quicker and more accurate results, Infinity has developed an optional test and measurement kit that allows the user to perform a series of measurements and aids him/her in properly setting the Bass Optimization System controls. With the addition of this kit,the Bass Optimization System becomes truly room-adaptive.

The kit consists of the following:a test CD, a sound-level meter that is specifically calibrated for low frequencies, and something we call a “Q-Finder, ”a device to help find the width of the measured curve and, finally, a measurement template. It works as follows. The listener plays the tones from the test CD and records the relative output level of each test tone, using the sound-level meter, on the provided measurement template. After all the tones are complete, the template contains a response curve for the frequencies below 100Hz. The user simply notes the frequency of the largest bass peak,calculates the correct amount of attenuation,and uses the “Q-Finder” to determine the width of the curve. These three values are dialed into the Bass Optimization System controls located on the speaker.The entire process takes less than twenty minutes.

If your dealer does not stock the Bass Optimization System test and measurement kit,you may purchase it directly from Infinity. U.S. residents can visit our Web site at www.infinitysystems.com or call 1-800-553-3332.Canadian residents should contact their dealer or call 1-800-567-3275.

Ask for Infinity part number 335852-002.

IL50 L/R

IL50 L/R Mechanical Parts List

* On 9/1/2000 a new replacement port tube was included with the IL50. Supplied part number reflects the new part. In addition, modified IL50 product w/ new port tube may be identified by the following serial number prefixes, which appears on the amplifier faceplate and the carton barcode label:

IL50BLKL - NM0825-01001 and above IL50MPLL - NM0826-01001 and above IL50CHL - NM0827-01001 and above IL50BLKR - NM0828-01001 and above IL50MPLR - NM0829-01001 and above IL50CHR - NM0830-01001 and above

NOT FOR SALE

IL50 L/R

Exploded View

CABINET,

IL50

(NOT FOR SAL E)

PORT TUBE,

336805-001

See page 12

SCREW, (10)

#8X.75 " PB PPH BL K

900101-012

SCREW, (6)

#8X.75 " PB PPH BL K

900101-012

SCREW, (2)

#8X.75 " PB PPH BL K

900101-012

SCREW, (3)

#8X1" PB PPH BL K

900101-016

SCREW, (3)

#8X.75 " PB PPH BL K

900101-012

SCREW, (4)

#6X.75 " PB PPH BL K

903401-012

SCREW, (4)

6-19X.375 MS PPH BLK

905401-006

SCREW, (6)

#6X.75 " PB PPH BL K

903401-012

SCREW, (4)

8-18X.5ZINK MS PPH BLK

905802-008

MID RANGE

TRANSDUCER,

335741-001

SCREW, (6)

#6X.75 " PB PPH BL K

903401-012

GRILLE CUP, (6)

333249-003

GRILLE CUP, (3)

333249-003

GRILLE CUP, (7)

333249-003

BAFFLE, 336163-001, R 336163-002, L

VOLUME CONTROL

ASS'Y w/CABL E,

336250-001, R 336250-002, L

(ROTATED)

NETWORK, 336476-001

SPIKE (4),

331360-001

WOOFER,

335808-001

TRIM RING,

336162-001

BUMP-ON (4),

330104-001

GRILLE, BLACK, LEFT 335612-072 GRILLE, BLACK, RIGHT 335612-071 GRILLE, MIDNIGHT BLUE, LEFT 335612-052 GRILLE, MIDNIGHT BLUE, RIGHT 335612-051 GRILLE, RICH BURGUNDY, LEFT 335612-062 GRILLE, RICH BURGUNDY, RIGHT 335612-061 GRILLE, GRAY, LEFT 335612-042 GRILLE, GRAY, RIGHT 335612-041

AMPLIFIER,

NOT FOR SALE

TWEETER,

335225-002

PEDESTAL,

336256-001

00269

GRILLE, WOOFER,

Part of Se t - See

Upper Grille Optio ns

IL50 L/R

Exploded View of Amplifier

00277

Rear Plastic Cover

930050

High Level

Binding Posts-JC0104

Power Cor d, 15 F T .

WI0043

Feature PCB

Linear PCB

RABOS PCB

Power Supply

PCB

EMI Filter

PCB

IL50 L/R

Service Tips

+ 32 hidden pages