Try the Texas Instruments and International Rectifier websites for switching amplifiers. I think you might find the components easier to obtain using a switching power supply and something like the National Semi LM3875 single-chip amp -- I have this operating in one of my cars.
Is this what you are looking for?:
http://www.diyaudio.de/bdamps.html
Also loads of car amplifier chips from Philips:
http://www.semiconductors.philips.com/products/standard/analog/products/amplifiers/
Dirk
http://www.diyaudio.de/bdamps.html
Also loads of car amplifier chips from Philips:
http://www.semiconductors.philips.com/products/standard/analog/products/amplifiers/
Dirk
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