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

Showing 6 responses by flemke

Get the DD-15. I have mine set at 4 and have no plans to crank it up any higher.
http://www.velodyne.com/velodyne/products/specs/DigitalDrive.html
Look at the specs.
The guy from Velodyne is old school. He is a hoot to talk with. He rminds me of Tom Port from better records. I was also thinking about two DD-15's. For me it's just overkill. My DD-15 is set to 4.
Dgw7000

Did you hear the DD-15 or 18? What do mean when you say "does not compare"?

Tim
Dgw7000

I would have to say the local hifi house did not have the Velodyne subs setup correctly. They should call tech. support and get them running the right way.

Tim
The DD-15 has 1/2 of 1 percent of distortion.
The setup is very simple and anyone who owns one should press the auto button. It's that simple.