Can you wire an amplifier into another amplifier to boost the power?

Update: So I am building an ammo can boom box and have run into a little problem. I am doing this on a budget and I bought a cheap amp board on amazon that has bluetooth capabilities. It says 50w per channel but I assume it's more like 15 rms. I was wondering if I could run rca cables from the output of that amp into a... show more So I am building an ammo can boom box and have run into a little problem. I am doing this on a budget and I bought a cheap amp board on amazon that has bluetooth capabilities. It says 50w per channel but I assume it's more like 15 rms. I was wondering if I could run rca cables from the output of that amp into a slightly more powerful amp and be able to boost the power a little bit. I am using 30w rms 4 inch speakers so it doesn't need a whole lot.
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