Bose Acoustimass 3 Series Manuel - Page 7

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1. Specifications

AM-3P II THEORY OF OPERATION

NOTE: The following discussion references the AM-3P II/Multimedia Main and Amplifier

PCB schematics, and block diagrams. The block diagrams, Figures 3 and 4, can be found

on page 6 and the schematics are located in the back of this service manual.

The AM-3P II powered Acoustimass

Home Audio and Multimedia. Both variations can be used with the Bose

System or other sources that have line-level outputs. The multimedia variation was designed

specifically for computer sound amplification. The basic differences of the multimedia are as

follows:

• 10dB higher gain to accommodate the lower output level of computer sound cards.

• Higher input impedance for compatibility with most industry standard audio equipment.

• RCA input jacks allow mixing of two separate stereo signals (Source 1 and Source 2 inputs).

The AM-3P II is based acoustically on the AM-3P Series I Acoustimass

speaker system. The distinguishing difference between Series I and Series II is the change

to a new satellite enclosure (AM-4), and equalizer PCB assembly designed to compensate

for the acoustic differences of this new enclosure. Listed below are some of the features of

the AM-3P II.

•

Automatic turn-on/turn-off mute of the amplifier output stage

•

Automatic (BOSE

•

Bi-amplification for better power distribution to speakers

•

Active equalization for smoother frequency response

•

Amplifier short-circuit and DC offset fault protection

•

Local volume/sensitivity control

•

Bass/treble room compensation controls

•

Differential input stage (to reject hum)

•

Dynamic compressor to prevent amplifier output overload distortion

NOTE: In the discussion of L/R (left/right) channels, only the right channel is discussed. The

left channel operation is identical.

1. Power Supply

A single, universal, 115/230V EI core power transformer is used to power the system. It has

been specially designed for minimum magnetic flux leakage and stand-by power consumption.

The transformer primary remains energized (always on) except when the power switch is in the

off position.

GENERAL

loudspeaker system is manufactured in two variations:

patented) dynamic equalization

BLOCK DIAGRAM DESCRIPTION

Lifestyle

Music

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