A bi-wire can give a small increase in sound quality, but you need to start with a cable that is large enough. Many cables (even some of the more expensive ones) are not large to start with. Audioquest speaker cables are an example as they are only 13awg to start with. When you bi-wire them, you will split the cable into two smaller cables (probably a 15.5awg / 16.5awg combination).
I would recommend not doing a bi-wire unless the cable is at least 9-10awg to start with.
I would recommend not doing a bi-wire unless the cable is at least 9-10awg to start with.