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Look. I think the best way to get a tested power-audio-amp scheme is to get those ones that firms suggest around their own chips. I encourage you to have a look at Philips datasheets. I've built the one corresponding to the TDA 1554Q and I can say it sounds perfectly [2x22w RMS on 2 speakers of 4 ohm]. I've built these days the one corresponding to the TDA 2616Q too but I've had no oportunity to test it yet.
Follow this link and check the 'Analog and mixed devices> Signal amplification> Audio amplifiers' extendable tree: