Has biwire speaker cabling become "old" ?

I don't know, but I am bi-wiring my Legacy Focus SE's with two pairs of stereo speaker cables (took the jumpers out) and it sounds great (smoother and tighter in the bass). I think it's a bit more musical as well.

The interesting thing is that the single-crystal cryo-treated copper wire and dielectric material for each pair is the same, but the pair going to the mids and highs is a lighter gauge and costs about half the price of the pair feeding the woofer sections. I'm using 6' runs.

Whether or not biwire has any value is debated. Some believe it only has value if two pairs of cables are used, and that internal biwire cables are useless. I did read an interview long ago with a very well known speaker designer who said it was easier to design his speakers for biwire than to explain why it was useless to do so...

Audiophiles are a fickle bunch, things become popular, then lose popularity, then cycle back around again. I've biwried, and not biwired, they both work.

The biwire does sound good, but for me, at this point in time, I'm having more success running a higher quality (re: more expensive) single wire run with a quality jumper. I wish I could afford to biwire with the cables I have, but sadly, I can't.