Originally Posted by pameredith
I hate to be a jerk here, but while the math sounds good. It is actually flawed. It is not sound that travels down the speaker wire. It is electricity that makes a magnetic charge on a voice coil which reacts with a magnet which makes a cone move which... So the fact that you add 10 feet of speaker wire really doesn't matter because it is not traveling at the speed of sound, it is travelling at the speed of electricity (light) which is 299,792,458 m/s. Now you can do all the converting you want, but trust me, once you take out the speed of sound and insert the speed of light, the distance of your speaker wire can be measured in miles instead of feet
Its not flawed your understanding of delay is flawed:
That math I did was to determine the time it takes for sound coming from the speaker traveling a given distance to your ears. The duration of time delay you get from electricity is insanely small especially on such a short distance. Its ridiculous to add that factor in.
The distance set in the receiver "could" also mathematical compensate for electrical speed of wire over that given distance (which i doubt since its so insignificant and the maximum distance in these receivers is 30 foot per channel).. not a serious delay, even if you use low end radio shack speaker wire and the electricity is slowed down to 50% the speed of light.
The primary thing I know this receiver has to calculate for is the speed of sound based on distance of the speakers (which are producing the sound), Once it knows the distance it just sets the delay for each channel based on that distance.
I wanted to have a fairly accurate number to know how much of a time shift its gives per foot...especially since it seems like we have to use it to tweak our systems for delay.
When I 1st read that increasing the distance would change the delay.. I had my doubts being that we were talking about such short distances. I did this to prove whether or not there is enough of a shift in time that this is plausible... as you can see above it is.
PS: If you wanted to entertain the inclusion of the speed of electricity... even at 50% speed of light (some expensive cables claim up to 90% speed of light, like Valhalla cables)... however, even at 50% the speed of light thats 495 million "feet" per second... not worth calculating for .. there is no way your ears and eyes function fast enough in your brain to detect such a minuscule delay. (not for a 30 foot distance based on that speed)