Philip Hamm
Senior HTF Member
- Joined
- Jan 23, 1999
- Messages
- 6,874
Saurav wrote in this closed thread
The sonic differences due to cable length, if any, have nothing to do with the speed at which the electric field moves within the wire. As people have pointed out, the propagation speed in copper is something like 1/2 to 1/10 the speed of light (note that the actual electrons move much more slowly, but that's irrelevant).
Any differences you may hear are due to the resistance, capacitance and inductance of the speaker cable. These parameters interact to turn the speaker cable into a filter. For example, the greater the capacitance, the more the high frequencies will be rolled off.
If you want to try this test, do it with one of those flat ribbon speaker cables, those have fairly high capacitance. Take a 10' run on one side, and a 100' run on the other. Now you have something that you might be able to hear. Again, this won't have anything to do with the electrons arriving late on one side. However, one side will attenuate treble frequencies differently from the other, and that might be audible.
So, if you want to try and do the math to predict the outcome, find out the capacitance per foot of the speaker cable you're using. Put that in parallel with the speaker's impedance and the amp's output impedance, and calculate what the high frequency roll-off point will be. See how many feet of speaker cable you'll need to bring that point down into the audible range. If you can do that, then try the test to see if a difference is audible.
I've seen several people use the "speed of light" argument in discussions on cable lengths. IMO, they completely miss the point. A classic case of not knowing what to measure.
Saurav, after reading this I am very interested in hearing your opinion regarding the concept of biwiring.