Will 12" drivers produce slam in a 12 by 12 room? I think that they will, but this is very subjective. How much slam do you want? I think that slam is probably a sort of coloration, but for me it is a euphonic coloration. I like to feel the thump in my gut, the visceral impact along with the aural impact. If in this case "best" is "most", then bigger is pretty much always better.
You should just go ahead any buy that used pair of Piega P-10s on the Gon. I love mine and they have the most articulate and satisfying bass of any speakers I have owned to date.
The thing with Legacy is my father owned them and tho you would think they slam they dont, as I mentioned earlier the Vandersteen Quatro is a speaker I would look into...my dad purchased the wood version and they make the Focus sound like a sloppy limited LF speaker. My father was happy with his Legacy speakers for years but didnt know what he was missing til he found it.
I dont know about the slam being coloration, I think most take slam to be quick fast, tight and that impact you can feel that makes you smile....thats Vandersteen's bass.
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