The resistance of copper cable is often overstated. Quality network cable has about 0.1 ohm/m/direction. So two pairs in paralel for each direction (4 wires), for a total of 5m should have about 0.25 ohm total resistance. I wouldn't say audiophile approved, but probably very close to undetectable for most, both regarding the loss and the response.
> but probably very close to undetectable for most, both regarding the loss and the response.
Yah. Take an 8 ohm speaker, which might vary from 5 to 20 ohms, but is relatively close to 8 ohms for much of its range.
At 5 ohms, your voltage is attenuated by 5% -- this is -0.45dB. Re: the "heating the cable" waste, you're losing .45 dB of sound output to heat.
At 20 ohms, your voltage is attenuated by almost nothing (.05 dB).
In any room, and with any real driver and amplifier you're going to have far bigger concerns for flatness of response than this .4 dB variation.
Bigger concerns are--- having something stranded and chonkier with big thick insulation is good for robustness and strain relief instead of trying to abuse network cables (even stranded) for the job. You can get thicker, nicer wire for this purpose than network cable for less money.
