In every situation where I've biwired, the sound quality improved. This was limited to using the same quality cables in both single wire and biwiring. I have never compared more expensive single wiring to lower priced biwiring. The typical benefit was an increase in midrange clarity.....similar to the difference when using good power conditioning.....the offending artifacts aren't that noticable until removed.
I think I first experimented with biwiring with Mission speakers in the mid 1980's.
I think I first experimented with biwiring with Mission speakers in the mid 1980's.