Infinity BU-150 User Manual

Infinity Systems Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
1-800-553-3332
A Harman International Company
Rev A 3/2000
BU-150
Powered Subwoofer
SERVICE MANUAL

Infinity BU-150 Specifications

General

Brand	Infinity
Model	BU-150
Category	Subwoofer
Language	English

Summary

SAFETY INFORMATION

Warning

Any service must be performed by qualified personnel due to hazardous voltages.

Caution

Unit has hazardous voltages when plugged in; check voltage correspondence.

Leakage/Resistance Check

Perform leakage and resistance tests before returning the unit.

Safety Components Replacements

CONTROLS AND THEIR FUNCTION

Low Pass Control

Phase Switch

Level Control

BU-150 CONNECTIONS

Low-Level Signal Connection

Connects subwoofer using a low-level signal from preamp outputs via RCA.

High-Level Connection Advice

Connecting Subwoofers

Low-Level Wiring (Figure 3)

Details low-level connections for single/stereo or mono subwoofer outputs.

High-Level Wiring (Figure 4)

Explains connecting via high-level inputs using speaker wire.

Connecting Subwoofers to Satellites

Two Subwoofers Setup (Figure 5)

Single Subwoofer Setup (Figure 6)

Satellite Connection Methods

Stereo Pair Wiring (Figure 7)

Crossover Control Usage

OPERATION

Setting the Controls

Guides initial setup of Volume, Crossover, and Phase controls.

Adjusting Volume and Tone

Crossover Frequency and Phase

Detailed explanation of setting the crossover frequency and phase.

Room Placement Advice

Advice on optimal subwoofer placement for best low-frequency enhancement.

TEST PROCEDURES

General Function Test

Steps for testing basic functionality using signal generator.

Sweep Function Test

Driver Function Test

Steps to test the driver's DC resistance and listen for noises.

POWER AMP MODULE DIAGNOSTICS

Testing Flowchart

Step-by-step diagnostic procedure for the power amp module.

ELECTRICAL PARTS LIST

Resistors

Capacitors

Integrated Circuits

Inductors

INTEGRATED CIRCUIT DIAGRAMS

Power Amp Module Installation

Critical procedures for installing the power amp module to avoid destruction.

SCHEMATIC DIAGRAM (Part 1)

BU-150 Schematic 1 of 2

Shows the first part of the electronic schematic for the BU-150.

SCHEMATIC DIAGRAM (Part 2)

BU-150 Schematic 2 of 2

Shows the second part of the electronic schematic for the BU-150.