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I recommend you explain your goal a bit more if you want some replies. The topic sounds like you are trying to decide between the two... but your post makes it sound like you have both already and will be using them together... not really sure what info you are asking for.
 

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Both of those subs are high priced but small. The JL is likely to perform better IIRC. But most of us here are into larger subs that go deeper/louder but cost a lot less than those two you mention. Is your listening room fairly small? We would need to know the cubic footage of your room.
 

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Overpriced compared to Internet Direct subwoofers. Many people are buying their subwoofers from ID companies including SVS, HSU, Epik, Ed, Ascend, and others.

These companies usually have offerings that can get the job done for less than the store brands you have mentioned.

The issue for you is likely to come down to how big a box can you live with. For example, the Ed A7-900 is $2,500 delivered, however, it is also quite large at 26 X 50 X 27 inches.

Using a huge ported box, 2 times 18 inch drivers, and a 1300 watt amp, the A7-900 should easily fill a room of your size. Most likely, the box is simply much bigger than you want in your room.

Still, it gives you glimpse into one of the companies people are buying from.

A much more reasonably sized high performance model would be the SVS PB-13 Ultra.

Check the top unit from Epik. http://www.epiksubwoofers.com/porteddynasty.html

While the Conquest has not been taken down from their web site, there is a good chance it will not reappear, at least any time soon.
 

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I'd start with one PB13 and see how that works. If you are still craving more, you can always buy a second. In your large room, you don't want to short change yourself, and should go for a large cabinet ported sub. The JL sub is amazing, but there is no replacement for displacement.
 

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Basically size matters when it comes to subwoofers. A larger ported sub (SVS PB13) will more likely outperform a smaller sealed type subwoofer like a JL F113 when it comes to depth of bass. There are many reasons for this and it's due to the physics of reproducing bass. The SVS uses a ported (bass reflex) design which inherently produces deeper bass. The JL uses a sealed design (search for Acoustic Suspension loudspeaker) but needs more power and a very beefy driver to come close. Again, the JL is an amazing sub that uses superb engineering but it's like bringing the best knife to a sword fight.
 

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Def Tech subs are not bad. They use a design called passive radiator design which allows some of the advantages of a ported design but with less cabinet size. My experience with the Def Tech is that they sound a bit less controlled (the bass notes sound looser rather than a tighter, more accurate sound), I don't think they are in the same sound quality league as the others based on my experience with the other Supercubes.

Because the Definitive uses multiple drivers aimed all around, I also find they seem to be very picky with where you place it as well

The other beef I have is that their specs have been shown to be too optimistic. The actual measured performance never lives up to the spec sheet.

If you can pick one up at a substantial discount (say 35-40% off), they would be decent bang for the buck still
 

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Agreed. I'd get a pair of PB13 Ultra if you can handle the two large boxes, if not then get the JL F113
 
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