I have four small power amp modules I built some years ago for a project that I dropped and didn’t complete. I’ve never built a BTL amp before, so I thought these would be good candidates to experiment with. I know the power requirements for them (single module, mono), how do I figure the requirements if I BTL two together. I can’t find anything in any book on my shelf or on the net? HELP! Any suggestions or point me to an article. Thanks.