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15" vs 18" subwoofer - which to buy?

If price and room space/aesthetics were not a big issue, is there any reason to get a 15" subwoofer over an 18" one? My main issue is not disturbing the neighbors too much. I'm confused about the difference between a 15" and 18" subwoofer. I want to get the best sound quality possible for low-to-medium volume use.

I've heard that an 18" subwoofer can be played at low decibels and provide good bass resolution and fullness of sound, while to achieve the same volume with a 15" subwoofer, the power has to be much higher. So for any given sound volume, the main difference is in distortion- and higher distortion sound may be more obtrusive. Is this true? it seems counterintuitive that an 18" subwoofer could be better for neighbors than a 15" subwoofer.

However, I compared a B&W800 (12") vs B&W850 (15"). I listened from the other side of the store wall (not as thick as my apt), and at minimum levels which I found satisfying for HT, I found the 12" more obvious and 'boomy' sounding while the 18" produced a more subtle (though actually more powerful), lower frequency vibration, like a very low-level rumbling background earthquake. The 15" subwoofer did seem more of a disturbance because of it's 'obvious' sound. However, I worry that an 18" won't even start producing quality sound until a certain volume that was much higher than a 15", and consequently potentially more disruptive for neighbors. Is this true? What is the relationship between subwoofer size, low sound volume, and subjective listening experience?

Unfortunately, it will be difficult to get an opportunity to hear both the DD-15 and DD-18 which I am considering, so I hope someone can help out here.
no_slouch
gregm
3,405 posts
 
Is it a non-contested fact that multiple 12" subwoofers could match or best a single 18" subwoofer in terms of quality of low bass?
In theory you can do it. In practise it is VERY difficult to simulate a single point source (the 18") with many 12".
You'll be happy with yr DD-18; it's a very good product.
eldartford
4,262 posts
 
Gregm..."VERY difficult", perhaps, but to simulate a point source to the left or the right with a center speaker is downright impossible. I agree that the Velodyne 18 incher is a good product and will no doubt work well.
kenl
131 posts
 
No slouch,

I too listened to a DD-12 at a local dealer over the weekend, and while it did a credible job in a moderately large home theater room, it didn't provide the tactile shudder of an 18" sub. Like you, I'm going to go with the DD-18. Still thinking about 2 of them? I suppose you won't know until yours arrives.
gregm
3,405 posts
 
Eldartford -- agreed. How 'bout two subs then, driven from line level:)
eldartford
4,262 posts
 
Gregm...I'll see your two SW, and raise you one center SW. I also have SW drivers for the rears, but haven't got around to putting them in enclosures.

I think that every speaker system should be flat to near 20 Hz, and that usually means you need to add another driver, called a SW.
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