That CV sub is a pro sub, designed for bands, etc. it does not go down very much below 35Hz or so but plays extremely loud. It is not for HT use. The 123AV MFW-15 is a new model and I haven't seen any pro reviews but first looks sound very encouraging.

Not sure what you mean by a "true" sub. Can you explain?

The better of the HSU and SVS models will probably outperpform the others, especially the "turbo" model from HSU and the top cylindrical and top box subs from SVS.

Where do you get "little" subs from HSU and SVS. Are you talking about the small cube style models sometimes called mini subs like the SVS SB-12 Plus or do you mean any sub with a 10' driver. Please be more specific if you want better answers. What us the sub for, movies, music, both and what size room and other speakers.

RR6