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Left & Right Speaker cable lengths - equal, or unequal?

Left & Right Speaker cable lengths - equal, or unequal?
« on: November 08, 2016, 02:05:41 PM »
Finally underway with building out my first home theater room.  My room is 13' wide x 26' long x 7' high ceiling (basement).  I have an adjacent 6' x 6' closet being converted to the HT gear room.  I am installing a 7.1.4 Dolby Atmos speaker array using GoldenEar Invisa SP 652s (4 each) in the ceiling and Supersat 50s (4 each) for wall surround speakers.

With the equipment closet off to one side, the speaker cable lengths from AVR to speaker locations are much closer on one side (say 15 feet to right side) and quite far to reach the left channel sides (say 30 feet).

Coming from the dedicated 2 channel music side, I've always ran equal speaker cable lengths to both left and right channel speakers.  Is there a consensus for surround effects channels that equal speaker cable lengths for each channel are still good practice?  Or, overkill in this situation?

Continuing on to the front L, C &R channel speakers, same question.  The furthest channel left speaker is about 40 feet and the nearest right channel is about 25 feet. Should I use just enough speaker cable to reach those? or, run equal cables lengths to all three (approx. 40 feet each)

Thanks
Kenreau


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Re: Left & Right Speaker cable lengths - equal, or unequal?
« Reply #1 on: November 08, 2016, 02:55:09 PM »
When we ran ours...we just left a few extra feet, just in case we ever get new equipment or move the speakers. IMO there is no need to make the wires equal.
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Re: Left & Right Speaker cable lengths - equal, or unequal?
« Reply #2 on: November 08, 2016, 03:12:37 PM »
I remember on my first home theater build, I ran equal lengths to all five of my speakers. Later I learned that it did not really matter. The time delay difference in even 50' of extra wire is so small that it requires pretty good measuring equipment to show a difference. You will never ever be able to hear a difference.
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Re: Left & Right Speaker cable lengths - equal, or unequal?
« Reply #3 on: November 20, 2016, 06:03:48 PM »
Well, the speed of light is 186,000 miles/sec.  Electricity through a home generally runs about 1/100 of that speed so we are saying 1,860 miles/sec.  Sound travels at 1115 ft/sec roughly which is 0.21 miles/sec.  Therefore, the electrons providing the signal to your speaker moves approximately 8,857 times faster to your speaker than the sound travels from your speaker.  You would need miles of speaker cable difference in order to make a dent in the timing.  So, 20 or even 30 extra feet will make no difference in apparent sound timing reaching your ears. 
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