Car amplifier.

I have a friend and he just bought a 300w SubWoofer for his car. and was looking for an amp to go with it. Most of the amps he found were about 10k so, I asked my dad and he was willing to make one. Now the problem goes as follows- He used to make a lot of amps in his old days with premade circuit broads but now they just faded away. He cant find any PCB's with 300w delivery for a 12v input. If anyone can tell me a circuit diagram for it, it would be great!
Thanks in advanced!
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