As my home theater finally finishes near completion; after entering the hobby 10 years ago and just daydreaming about the day of having quality equipment and a nice room for it, I'm thinking of adding my second SVS sub to fill out my room, which is 12ft by 35. Anyhoo...I have one of the "old" 16-46pc's. My order number is something like #324. When SVS came out with the upgrade driver, I popped that in a made a killer sub, more killer. So, I'm going to add a second sub. Thing is, I want one of the newer Plus series. Of course I'm going to get another 16-46 but, since it (Plus) supposedly has a much better driver, even than the upgraded one in my original 16-46, and the fact that it has quite a bit more power with the Bash amp, I was wondering if you "sub humans" thought that there would be too great a difference in mixing these 2 subs? I realize that sub soundwaves are non directional. Considering that I, personally, can't see where the difference between an original SVSpc16-46 and a newer SVSpcplus16-46 could be that great. Not like mixing different mains, ect. Just thought I'd get some opinions before I possibly purchase another SVS.