Using biwired cables on speakers with only 2 connections

Like the previous two posters said. However, that may be bit difficult to accomplish due to their terminations / plugs.

Another option: sell the existing bi-wire cable, and buy a new full range (non bi-wire) cable

@emergingsoul 

Just use two and make sure that the others aren't touching. I have done it several times and it's not a problem. 

As others mentioned I’d try using both on the speaker binding posts if possible, then put some electrical tape around one of the cable’s connectors and see what you think, then put electrical tape around the other connectors and check that too.  It’d be an interesting experiment if nothing else, and you may well get your ultimate answer that way.  Best of luck. 

Unfortunately I have banana plugs, so I can't really combine connections to one binding post. Maybe I could cut off the banana plugs and have a raw wire and connect that along with a banana plug connection.

Alternatively, since my amplifier has a 4 and 8 ohm Port, I could reverse the cable and biwre the amplifier Side. Wonder if this makes sense

Maybe a good time to sell your current speaker wires and upgrade. I would look at it as an opportunity to re-optimize for your new speakers. I have found that my ability to discern sonic differences improves decade by decade and I can get much better match’s for my equipment.

While I have not done really careful listening tests… I don’t thing biwiring makes a difference above upgrading the connectors from the stock flat metal connectors. I’ve used to use biwired speaker cables. I now put everything into good mono wire (?) cables. Biamping can make a big difference of course, but that is different.