I did a DIY project using S&B 102 mk3's. I wired it in as an TVC switchable to AVC at first. Completely accidental, it was supposed to be a HT bypass. Scratched a few hairs out that day. Anyhow, I didn't notice much difference, just a bit more bass and gain with AVC. I have other options in bass control but even if I hadn't, the benefit of balanced connection and conversion with TVC was more important to me. AVC's can be balanced too, but it takes 4 of them. With different brands of either, there is not a direct comparison between TVC and AVC. These are also so system dependant that one man's molehill could be another's mountain.