Checked that thread and what's got reported there, only serious post been by Dr.Frost who seems to know a bit about how audio actually works, i hear keywords like enclosure tuning, etc. I don't think we can do much on PCB to support an undefined mod that might get invented eventually. Maximum I could do is keep the PCB area clean around the speakers so no components are in the way when you replace your speakers. A few further notes: speaker electrical impedance and power has to match the amp, speaker acoustic impedance and resonance frequency has to match the impedance transfromation and tuning of the enclosure(s, both front and rear of speaker). And last not least: a speaker running into clipping (either in amp or in speaker coil) always sounds much louder than a speaker with higher power rating that doesn't clip at same signal. Alas clipping also means: it will sound to make your ears bleed. anyway thanks for the pointer, I'll keep it on my long range radar. :-) /j