I would say it applies to any passive crossover system. The whole point of the crossover is to take a load (signal), split it into 2 separate loads (bass and treble), send it to respective speakers (on time, so it produces sound in phase), then re-integrate the load on the negative pole return to the amp. If you split the loads, then you take away phase control. Seems like a bad idea. From my experience, it was bad in reality. For example, Norah Jones. Perfect music to make biwire look good, right? Airy, treble-heavy. BUt when I biwired, cymbals in particular sounded muddled. There are tracks where cymbals are being played with wire brushes at the same time that maracas are being shaken. When biwired, this became a mushy, sibilant mess that hurt my ears. Single wired, I could clearly distinguish the two instruments. I noticed similar issues in many different albums and types of music. Not to mention the soundstage was off when biwired. Echo-ey. Hollow. Of course, INHO, YMMV, etc, but I highly encourage you to try fat single wire and see if you like it better.