Quote:
If your SW, for example, cuts out for anything above 100Hz, then any time alignment value below 10ms is unlikely to be a problem.

Errr, wouldn't 10ms delay exactly cancel 50Hz signal?

Ah, but 10ms is huge: sound travels around 3m in that time! Surely, our delays would be of order of 1-2ms, right (or did I miss an order of magnitude or two somewhere)? So, you seem to be right (of course ), Mark: phase difference would probebly be negligible.