amplifier schematics

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Hi, im new to diy amplifiers, and to be honest i really don't have a clue.
i want to build an amp to be be used in a subwoofer. it has to be cheap, ca 150w rms output and be able to handle 4ohm. could anyone please explain what kind of amp i want to build or\and even give me some schematics for one that will siut my needs?

thanks alot in advance:)
 
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