I have heard the impact 12-
My thoughts on it during brief listening were that's a pretty decent sub, fairly tight, and not bad for a medium to smallish room. The downfalls for me were it's black ash looking cabinet. Also, I think bass extension as quoted as higher than what it actually is, but I haven't tested it. I like the glossy that velo normally has. Not that powerful. I've heard the sub10 too, and I concur, I like the impact better.