I haven't seen you around here nowadays, judging from that mod and your signature you active on other subforum it seems

Anyhow kudos for the mods! I haven't thought of using car amp to power speakers but there you go, you done it It would be easier if you just bought something simpler like T-amp, 12V PSU and a volume pot. But then its your money so its your mod. I like the idea of using crossover, that makes it better to tune the passing frequency to speaker and subs.