I believe that two different cables is a definite advantage over being stuck with one type that may not be optimal for both ends of the frquency spectrum. There is no chance whatsoever of damaging electronics. If you're going through the trouble of using two sets of cables, why not use the best cables for highs and for lows? Unless the cables are realllly looong, impedence mismatch will have little effect.
2 different cables on biwire speaker
Has anyone ever tried to use 2 different brands of cable on their speakers at once? I noticed I get a cleaner bass if I use pure silver on the bass drivers. But it gives me to much glare if I run it on my tweeters. Is it ok to run 2 different cables ( same length ) or will it hurt my speakers?