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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
kr4's avatar
kr4
3,424 posts
 
The issues of room modes will remain. There are basically two ways to deal with them:
1. (re)positioning speakers and/or listener to avoid the worst spots
2. acoustic room treatment to tame them

The EQ on the DD-subs is an excellent one that will help in any room but it cannot fill a (bottomless) null.

BTW, the DD-15 should be OK in that room, if you treat it right. ;-)

Kal
Post removed 
flemke
557 posts
 
I have a DD-15 in my basement and it's set to 6 or 7.
The DD-18 is most likely more than you would ever need.

Tim
madhf
170 posts
 
I agree with the other posts that state the dd-15 will be plenty adequate.
owl's avatar
owl
132 posts
 
I've also been trying to decide between the dd18 and dd15. From what I've learned from speaking to people who've had both is that the DD 15 will match the size and speed of your main speakers drivers better than the 18. You should go dual subs if using them for music if it's possible in your budget/room/setup. Avantgarde did a white paper that explained the technical reasons behind that some time ago you may want to reference. My understanding is that if you use only one it tends to cancel out a lot of the cues in the bass information. Remember, digital bass is in TWO channels ! Your sense of space, size of the venue pace and air will improve with the dual setup. You'll have faster and perhaps tighter more musical low end.

Also, some folks have moved from one or two dd 18 's to dd 15 for the above reasons.
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