subs for Sonus Faber Cremona M floor standing

He's my dilemma: I already have one REL 505, and I can find another on 'Gon for about $1000. If I switch to the Velodyne DD12 (same piston size as the 505)I will want/need 2 and the cost will run to $3000+ if I buy them used.

My question is, will 2 DD15's truly outperform 2 505's? I mean hands down, no questions asked undeniably better?

Thanks,
Mike

Okay - just back from the Velodyne website where I found the Optimum 12. The Optimum 12 is a bit more than half the price of the DD12 plus - so what would I give up if I go with the Optimum 12 over the DD12? And is there any experience with the Opti 12?

Would the Opti 12 be considered better than the REL505?

Dear Daveyf: Options always are open, IMHO all depend on each one targets/priorities on quality level performance.

+++++ " my mains (SF GH's) are lighting fast and I know of no large driver ( we're talking 10" and above) subs that are quick enough to match these mains, " +++++

this link touch that " myth ":

http://www.soundstage.com/maxdb/maxdb061999.htm

Regards and enjoy the music,
R.

Dear Fundsgon: You can get these couple for less that you stated:

http://www.audiogon.com/cgi-bin/cls.pl?homesubw&1327021301&/Velodyne-DD-12-Piano-gloss-bla

http://www.audiogon.com/cgi-bin/cls.pl?homesubw&1328659975&/Velodyne-DD-12-Piano-gloss-bla

I think that you can make some money when you sold the REL.

Regards and enjoy the music,
R.

Raul, why do you think that speaker manufacturers do not use 12"tweeters or even for that matter many 12" midrange drivers. OTOH, why do you think that subwoofer manufacturers do not use 1" woofers? The ability of the driver to push air may have something to do with it, NO? IMHO, the large 12" -18" drivers just do NOT sound that fast in compared to say a tweeter of 1".....an 8" driver cannot move as much air as a 18" driver, BUT to my ears it's a lot faster sounding in the mid bass- upper mid bass area. ( which is where most of the bass instruments are producing sound)
So is it really a myth, or do you let your ears do the walking and talking, or your .:0)