I'm still building so they're not mounted yet. My LCR HTM-12s are mated up with mere 15" subs in 9 cuft boxes LLT style. The damn things just dig, and dig hard. Anything from cellos or the left hand on a piano on down are tactile. If you've ever played a cello or a string bass in particular you'll know it's not just a sound but something you can feel in your pelvis. It's not just a tone, it's something where you can feel the bow gritting against the string. That kind of tactile. I love it, I really do. If you can do 10s, then do 10s. Whatever's the biggest speakers within reason you can accommodate, get that. I'm not worried about overwhelming, you can dial back. People talk about mid-bass like it's the sole dominion of the subs, but those frequencies are being handed off from the mains and they still have work to do on the way down past the LFE x-over.