It amazes me that so many are willing to buy and report on the differences in musicality they hear from various expensive cables, but so few are curious enough to want to know WHY they are hearing differences.
Basic cable characteristics are length (too short is bung), termination quality (non standard terminations break jacks and make short circuits), flexability (too stiff and they pop out, causing open grounds and system destroying hum), resistance, inductance, capacitance, and finally shielding (poor shielding causes hum and RFI dumped into your system).
It is important to understand that the cables in and of themselves DO NOT HAVE A SOUND! The electrical load they represent modifies the linearity of the equipment driving the cable and that change in linearity is what you are reporting on hearing.
You can easily observe what the cable is doing by connecting it to the driving equipment, terminating it into an appropriate dummy load, and driving the equipment with high frequency square waves and observing what the cable is doing to the linearity of the equipment on a scope.
Once you see how badly a capacitive cable makes many amplifier or preamplifiers misbehave, you won't like that cable's sound so much any more. A worse case was using Polk's very capacitive Cobra Cable with an early Threshold amplifier, which was designed without an output inductor as they assumed that the normal inductance of a speaker wire would be adequate isolation from a capacitive load. Of course the combination tied the capacitive load (the Cobra Cable) directly across the amplifier terminals and the result was the amp went into full bore oscillation and melted. Now anybody could hear the difference the cable made (and smell the difference too).
From a design standpoint, we try and make our equipment with very high current drive and as load insensative as possible to minimize the effects of whatever brand of cable you try and use, as any audible effects are likely bad effects.
We recommend cables and speaker wires with low resistance, low capacitance, good shielding, and standard spec terminations. I know its not much fun, but you can get all this at Radio Shack.
PS To provide better shielding in a strong RFI area, twist the speaker cables about 3 turns to the foot in an electric drill.
Frank Van Alstine