One word, AmpCtrl.
Having searched around on amp thump, I wired a 30A relay from my Opus 150W to my amp's remote-on-ACC. Now, at POST, instead of getting one thump from the amp (like when I had the amp remote wired directly to my ignition switch) I get THREE thumps. How irritating!
Anyway, I've searched for all the keywords I could think of but haven't found a viable solution to anti-thump - that irritating punch through the speakers when you turn the system on when not using a head-unit.
Are there any decent non-specialist answers here? A David Navonne solution appeared on my searches but importing stuff from the States to Poland is tricky at best (our postal workers are particularly light-fingered.)
I must have missed that! I'll try it with a relay first, and if it doesn't work and I can pluck up the courage, I'll play around with the transistor version