Originally Posted by Glimmie
Yes at audio frequencies wire length time delay is not significant, in fact a joke. Now at hundreds of MHZ or higher, it is critical. Even your modern computer motherboard has timed wire lengths on the PC board.
However you should still keep the distance matched within 10% if longer than 10 feet on the main speakers, surrounds are not critical in this respect. The reason is the wire does have resistance and you don't want the voltage drop on one channel to be audible versus the other.
Here is the unofficial AVS Forum guide to speaker wire:
Note my 10% above 10 feet is purely an educated empirical judgement. I have done no tests or measurements to verify it.
Before I was active on AVS, I posted this exact same question to the then Sound and Vision forum Nov-2007 and was advised the keep long runs within 10% , even for surrounds, since the trend was same amp power to all channels.
right or wrong, I did this, and it was a PIA, keeping the "extra" wire from 120v source, crossing at 90 deg to 120v source, wrapping in non circualr pattern, etc.
For 7.1 speaker in 14.5 ft x 18.5 ft this meant lots of "extra" (wasted) wire, I used 14ga 4c wire.
RH side wall, extra wire for RH side surround tucked above door frame, this was the most wasted wire, as its counterpart wrapped along the whole back wall to the LH wall.
Back wall, extra wire for RH back surround looped as shown
I'd like the definitive, engineering, objective fact based response to bring closure to this Q once and for all.
It shows up every few months.
I'm not a subject matter expert, so defer to others who are on this.