Yeah baby....I found a mate

Ach! another Tannoy DMT user! glad to see them in your system. I have the DMT-10s myself.
Aren't they just excellent speakers? probably out-do most other speakers in the market, n'cest pas?

Jsujo, good deal! I was about to write the same - sell the DMT-12 & get the DMT-15. seems like you had the same idea well before me!!
That's what I found - if you want a speaker for a medium size rm go for the DMT-10. If you want one for a much bigger room, skip the -12 & buy the -15 directly.
Will cost you! but it's worth the wait & money. Good luck!

I don't know if anyone here cares or not but........I thought that I shld add my 2 cents worth in a hope to provide some info & maybe even try to resolve what seems to be a minor tiff:

if you read "Analogbass" orig post of 7/17/05 where he mentions "greater overhang" & substitute "Greater bass boom" instead then I find that his statement does seem a little more credible. The "slower response" bit I DISAGREE with as well so we all are in agreement w/ that (& seemingly against Analogbass).
I *think* that what Analogbass is trying to say is that if you put a DMT-15 in a smaller room it is most likely to be ill-suited & that it will provide too much bass thus greater bass boom. IOW, the DMT-15 is likely to ill-couple to the room acoustics to provide a worse-off sound than a DMT-12 that might be better suited to a smaller room.
From my personal experience I have a DMT-10 in a 16'X16'X10' room & I often have to use foam plugs to contain the bass that I feel is too much & I'm using a 60W/ch integrated tube amp.
The transient response of all the DMT series II speakers has never been in question - they are all very fast.
(Just BTW, I personally prefer the DMT-15 sound 'cuz of its paper cone rather than the plastic cones of the DMT-6->12. However, there is something to be said for the right size speaker for the right size room).
FWIW. IMHO. YMMV.