Pure Music, there are many things that count when making a good power cable! RFI, EMF protection, vibration control, the material of the conductor etc! Even cable makers admit that if using too much or too little protection against those things changes the sound making it darker, brighter etc.! So in a say yes, they act as equalizers! For example there are people that believe that all power cables should be completely unshielded! ;)
I am not against power cables I just think that most of them are tuning tweaks!
Happy Listening
mike