Infinity BU1 - User Manual

BU1
Powered Subwoofer
A Harman International Company
Part No.: 1112-BU1 11/98
Technical ManualTechnical Manual
INFINITY SYSTEMS INC.
250 Crossways Park Drive
Woodbury, New York 11797

Summary

BU1 SPECIFICATIONS

BU1 CONTROLS AND THEIR FUNCTION

Auto Power

Controls the automatic turn-on circuit and LED indicator.

BU1 TEST PROCEDURE

General Function

Procedure for testing basic input and output operations.

Sweep Function

Procedure for testing audio performance across a frequency range.

Driver Function

BU1 AMPLIFIER BLOCK DIAGRAM

INTEGRATED CIRCUIT DIAGRAMS

IC1, 102, 103 - TLO72, Dual J-FET Input Op-Amp

IC101 - TLO74, Quad J-FET Input Op-Amp

PRINTED CIRCUIT BOARDS (TOP VIEW, component side)

PRINTED CIRCUIT BOARDS (BOTTOM VIEW, solder side)

PREAMP;CROSSOVER PCB

POWER PCB

PREAMP;CROSSOVER SCHEMATIC 120 V VERSION

POWER SCHEMATIC 120 V VERSION

Infinity BU1 Specifications

General

Frequency Response	27 – 175 Hz
Sensitivity	92dB
Type	Subwoofer
Impedance	4 ohms
Enclosure Type	Sealed