I use cheap figure of 8 lamp cable for speakers, but it's only a short run. For long run cable, you need to keep the cable impedance low, otherwise you can get base end cone flapping distortion. The output z of modern solid sate amps can be only a few milliohms and that's easily wrecked by hi z cables, especially on 4 ohm systems.
My ears are stuffed - around 10Khz last time I checked with an oscillator. Too much sound level while working in music in the 70's...
Regards,
Chris