That's the FR till 150Hz (sub+mains), which is a lot better uptill 115Hz without any EQ. However, there are 3 suckouts at 115Hz, 120Hz, and 125Hz (encircled), which I think I can fix by pulling the mains further out towards the LP and increase distance from the rear wall. I haven't got the time to do it yet.
Co-location gave me better midbass response as opposed to each sub on opposing walls. I could easily dig down to 11Hz that way, but I had huge suckout from 100Hz to 110Hz. Co-locating removed that null and pushed it further up in the response.
As far as listening is concerned I guess a lot has been said by a lot of DIYers in terms of sound definition. I would simply say the duals just drop the jaw, I threw anything and everthing at them at -10dB (Reference Scale) on AVR master volume. Following movies were tested;
Casino Royal (First 20 mins)
Knowing (Plane Crash, Train Wreck, and the final ending)
FOTP (Plane Crash)
Master and Commander (First 20 minutes)
Shooter (Hut explosion scene at the end)
Pearl Harbour (Japs attack)
WOTW (Pod emerging scene)
Skyfall (Last 25 minutes)
The Town (Last 20 minutes)
The subsonic response is hugely tactile. The duals can easily pressurise the rib cage, twist the gutts inside, easily flap the pants, and send a shockwave down the spine effortlessly. The feeling is similar to how you feel water hitting you from all sides during floating, if you know what I mean. It seems as if one is floating in bass. Also, the chest slam area (30-40Hz) hits you like a nuke. Midbass (100-150Hz) though a tad weaker in the current arrangement but it is a lot better than before.
Overall, just one word.................FANTASTIC
Couple of more things here .............Daytons are amazingly clean subs in terms of response. Also, the box resonance is virtually zero. On the other hand you can safely call Def Tech SC Ref a resonator more than a subwoofer coz all you hear from SC Ref is box resonance and that is it.
Note: As opposed to the intial plan of 850 watts, um feeding 1100 watts per sub, which pushes the cones to 19mm without deteriorating the response. And the drivers are still in the break in period. That means these babies can really take brutal pounding and the published Xmax is extremely conservative.
Edited by braveheart123 - 5/11/13 at 9:57am