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I am considering a Velodyne DD-18...

...to complement my Joseph RM25 siII speakers. When I went looking for speakers with more bottom end the dealer who sold me the Josephs said that in my room, 16'X13'X9', I'd have trouble with resonations. He suggested that a sub that could be tuned to the room would give better results. After much reading, I'm gravitating toward the dd-18 but I have heard it said that a smaller room may prefer the dd-15. I assume that the dd-18 will better reproduce the very, very bottom end and that the equalizer eliminates the issue with the room size. Anyone have opinions on the above? Thanks for any replies.
fosolitude
rwwear
2,692 posts
 
Magnet size in a sealed enclosure should actually be smaller. But the 15 is a great sub on doubt.
fosolitude's avatar
fosolitude OP
24 posts
 
Thanks, everyone, for your responses. The dd-15 appears to have the edge. Velodyne's website suggests that either is acceptable. Anyone have anopinion on their respective musicality? I should have mentioned at the beginning that the application is strictly two channel music.
dgarretson
2,394 posts
 
Well, I've found the DD-15 sounds clean and powerful in my 2CH set-up with Merlin VSM-MXs and a BAT VK75SE. If the DD creates excessive floor resonance, try elevating it on an Aurelex foam platform. If you have good electronics, you'll prefer using the DD in LPF (bass augementation) mode, rather than HPF xover back to the main speakers.
fosolitude's avatar
fosolitude OP
24 posts
 
Thanks, Dgarretson. In my current setup I run the B output from my Lamm LL2 out to a Sunfire Superjunior sub. The A output goes through an Art Audio Jota and from there out to Joseph 25Rm SigII speakers. The speakers claim +-2Db down to 32Hz but I measure a roll off much greater than that from about 40Hz and below. The Superjunior flattens that out down to 30Hz but can't keep it up in the sub-30 range and that's where I hope I can buld up some response.

Is placement in a corner/next to a wall critical?
flemke
557 posts
 
Put the sub next to one of the speakers and use the amp outputs to the sub inputs.
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