Anybody know where I can find results of a bench test for the Klipsch Sub-12?  I'm interested in the -/+ 3dB frequency response info, as well as maximum dB at the -3dB frequency

I just looked at the product page, and they list the maximum output at 117 db when loaded into a corner ( 1/8th space ) at 30 hz.

From this review : http://www.technofile.com/articles/klipsch_synergy.asp

It is said that the + - 3db window is 24 to 120 hz. Each and every room is different, but each of their subs are tested outdoors in a space that replicates a corner, like the average room. 

Extrapolation of the results, if 24 hz is 3 db down from the maximum level at 30 hz, then you would expect the maximum level would be 114 db at 24 hz. Of course, this doesn't mean the box falls flat on it's face, it will reproduce some frequencies below this with decreasing level. 

http://www.klipsch.com/media/news-center/reviews-press-pdfs/40869_eprint.pdf

 

 

Thanks for the info, and the links.

 I wonder how low it will go, and the slope (db/octave) from 24hz?  I'm planning to use the klipsch sub-12 for 40hz and under (LPF set @ 40hz), corner loaded ( behind the A/V rack, sub about an inch from the walls, with port facing away from the corner walls.

I have another smaller sub to handle 40hz-60hz (using a subsonic filter + crossover from the A/V Receiver).  So I'm thinking that by using the Klipsch Sub-12 for only 40hz and under, I should be able to squeeze more juice out of it for the much lower frequencies, even under 24hz.

 How would you apply a subsonic filter? There are a few methods, the least expensive would probably be an F-mod that plugs into the RCA cable

A ported subwoofer falls off at the rate of 24 db / octave below the tuning point. I can't say what the tuning point is on a Sub-12, I am not aware what it is.  Maybe a call to Klipsch tech would find that out, the only other way to do that would be to check yourself with single frequency test tones at a low level. 1-800-KLIPSCH

I've priced the F-mod, and it'll cost me about $55 total for both the inline filters and the required 3db attenuator to be placed in between two 20hz filters connected in series. 

 For $10 more, I can get an active subsonic filter that is not fixed to one frequency, with variable bass boost for a specific, selectable frequency.  I have found that adjustable filters is the way to go, as it allows for more accurate tuning, as well as blending of speakers and mutliple subwoofers.  I may think 40hz will work, but a different cutoff point may work better due to room acoustics.  Anyway, below is what I'm looking at.  LIke the F-mod, it'll go between the receiver and the subwoofer.

 http://www.creativesound.ca/details.php?model=B-1

 Thanks again for the response.  I will try and contact Klipsch as you suggested.

If you're relying on the Sub-12 to play frequencies 40Hz and under I'd be inclined to look at other subs that have useable output below 20Hz.  Reproducing 24-40Hz is a pretty narrow window for a sub like that.  Don't get me wrong, the Sub-12 is a great value for the money and a very good sub all around, but there might be other subs to consider that may work better in your situation.

Are you refering to SVS subs?  Even their cheapest cylinder sub goes down to 17Hz.

 By the way, I did email Klipsch Tech support to get more info on the Sub-12.  Their email stated that their engineers do not release the kind of info I asked for.

Yes, SVS is one example.  The Sub-12 is a great performer but as I said, I'd suggest a sub that has useable output well below 20Hz if its going to be cut off at 40Hz at the top end.

Got a PC12-NSD, and I'm very happy with it!  The smaller footprint was perfect for behind the TV/Audio stand, and the sound quality down to below 20Hz is amazing!!

 Thanks for the suggestion!

Nice!