Need info about this subwoofer schematics

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i need help about this schematic.
 

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Looks like a soft clipping circuit. When the signal goes large (positive or negative) the diodes start to conduct, which puts current through the transistors. The transistors have a squishy supply (22kohm resistors feeding in), so you can't put much current through before the voltage at the input is pulled down.

I could be wrong, though - I prefer to work with wood and speakers rather than electronics.

Chris
 
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