Bose 1600-VI Service Manual download pdf (Page 10)

THEORY OF OPERATION

1. General

The Bose

Model 1600VI and 1800VI Professional Stereo Power Amplifiers are two-channel,

installed/portable amplifiers made for professional sound applications. The 1600VI is rated at

240 Watts into 8 Ohms and 325 Watts into 4 Ohms. In the bridged-mono setting it can deliver

700 Watts. The 1800VI is rated at 450 Watts into 8 Ohms and 600 Watts into 4 Ohms. In the

bridged-mono setting it can deliver 1400 Watts.

The protection circuits designed into the amplifiers will protect them from unexpected faults,

excessive temperature, continuous current limiting and shorted outputs.

The balanced inputs use high quality, high common-mode rejection differential amplifiers for

exceptional hum and noise rejection.

Through the use of equalization cards the amplifier can provide active equalization for Bose

402™, 502

A, 502B, 802

, Model 25/32, Model 8, Model 1B and FreeSpace

360 professional

loudspeakers. These cards fit into the J6, Channel 1 and J7, Channel 2 connectors located on

the Input Module motherboard or the Bose ACM-1 Amplifier Control Module.

Additional Features are as follows:

• Two input connectors per channel allow 1/4" TRS, XLR, or quick connect terminal block

connection

• Two input connectors for each channel are wired in parallel

• Accepts balanced or unbalanced lines

• Independent CH 1 and CH 2 Level Controls with 11 detented positions

• Level Control Defeat Switch

• Dual Mono Mode for combining the power of both channels into a single higher powered

channel

• Sequencer connection for sequentially powering-up multiple amplifiers to limit instantaneous

in-rush current

• Bi-Amp/Full Range configurable

• Internally configurable for Parallel Mono mode for single channel low impedance operation

• Internally configurable for 0.775V or 1.5V rms input sensitivity

• Internally configurable input polarity of XLR connectors

• Class H dual-rail power supply

• Additional protection circuitry includes Clipping Eliminator, AC Lines Fuse

• Power Connected/Standby Indicator

• 7 LED display per channel, including power ready and Clip/Protect indicators

• Two-speed fan cooled

2. Circuit Descriptions

This section discusses the theory of operation of the 1600VI and 1800VI Amplifiers.

For a better understanding of the circuitry involved, refer to the schematics included with this

manual. Component pin designation is notated as follows: U1-7 means U1 at pin 7.

Unless otherwise noted, this discussion centers around the CH 1 circuitry.

The CH 2 circuitry is essentially identical.

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Bose 1600-VI Service Manual Page 10

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