Bose SoundDock 10 Service Manual page 59

SoundDock 10 Theory of Operation
Power Amplifier
Power Amplifier electronics integrated into same PCB as 24V switching power
supply
Class 'D' switching amplifiers drive 3 audio channels
TI TPA3100D2 drives stereo "twiddler" transducers
NXP TDF8599TH drives single woofer channel
(dual channel amplifier configured for mono operation with paralleled outputs)
Block Diagram
Audio Path
Continuous analog differential audio inputs from DSP (3 channels)
Power Amp ICs provide effective voltage gain of 20x for bass channel, 10x for
twiddler channels
Outputs of amplifiers are Pulse-Width-Modulated, requires 2nd order low-pass L-C
filters to reconstruct continuous signals prior to speaker loads
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