Biwiring can sound marginally better than single wire cables if a/ the speaker is properly separated in the crossover to take full advantage of biwire terminals and b/ the cables are true biwire cables (ie: physically separated into positive and negative runs either internally within a single outer shieling, or preferably a shotgun run of cable). If not, then investing in biwire cables is a waste of money.
Alternatively, if the speaker is not properly setup for biwiring, then using high end jumpers (preferably from the same manufacturer) with single wire cables should sound noticeably better than using the cheap jumper plates which come with most biwireable speakers.
I can't comment on other options suggested above as I have no experience with them.
Alternatively, if the speaker is not properly setup for biwiring, then using high end jumpers (preferably from the same manufacturer) with single wire cables should sound noticeably better than using the cheap jumper plates which come with most biwireable speakers.
I can't comment on other options suggested above as I have no experience with them.