• 20W amp into 300W speakers? I'd probably not try that.

    Always worked on that your amp should be bigger than your speakers. The idea behind that you'll be tempted to turn the amp all the way up, the amp will clip and you can get DC voltage across the speakers coils. This is a very bad thing and worse than overdriving the coil.

    You might struggle to find modern 20W speakers in bookcase format but you could get some active speakers and use a line level output from the amp to power them.

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