Hi there
I built a few amplifiers using PCB's that bought from AMAZON. It is important what chips are installed there. I like devices based on TDA7498 and TDA8950 and I don't like TPA3116D2. You must check it in their description. Also, the strongest power depends on the power voltage and if the tell you that output power can be 100W+100W and the voltage can be 12-24VDC you can get 100W per channel only for 24VDC. And one think more: highest power (say, 100W) produces 10% of THD or THD+noise. Good enough sound can be just to half of this power (50W for this case). Open my page in LinkedIn (Vladimir Benkhan). There are several articles there about high-quality sound.
I built a few amplifiers using PCB's that bought from AMAZON. It is important what chips are installed there. I like devices based on TDA7498 and TDA8950 and I don't like TPA3116D2. You must check it in their description. Also, the strongest power depends on the power voltage and if the tell you that output power can be 100W+100W and the voltage can be 12-24VDC you can get 100W per channel only for 24VDC. And one think more: highest power (say, 100W) produces 10% of THD or THD+noise. Good enough sound can be just to half of this power (50W for this case). Open my page in LinkedIn (Vladimir Benkhan). There are several articles there about high-quality sound.