Ahh, thanks for the explanation, Ian.

onn, I would only be trading up to the v4 if I did it. I was going to upgrade just the tweeters, but to get the full advantage of having them, I'd probably want the latest crossovers and DSP code, and I think I heard that there's new bracing in the cabinets. Would I even notice the difference? Maybe not, but it's my idle consideration at the moment.