Are you talking about the crossovers? Yes, adding subs you will only run your main amp from 100hz on up so it frees it up to sound better. Richard has shared that in order to integrate a sub, you need a full range speaker with a one octave cross over in order to do it right. At least right for what he professes. The way he does his subs is that the amp mimics the main amp you are using, so that's why it will sound better than any other brand with Vandersteens.
I wasn't saying the Treo CT with one sub wouldn't sound great, just that personally I feel it needs both. I've heard them that way a few times now and it makes a huge difference, but to me I still fee Quatro's are better when set up properly. Was it at Stereo Unlimited in SD? I bought a ton of stuff from Bruce back in the early 80's when I was stationed out there. It's a great store if that's where you were.
No grain of salt at all. When I read stuff that I don't fully agree with I always try to go listen to what they are talking about. It's not easy, but I try unless it's outlandish to me, lol.
It's all good man. We all love listening to MUSIC and not the components.