I have built two DIY subs... A Dayton RSS390HO (1000 watts)and a Dayton RSS315HF (500watts), both in sealed enclosures (Qtc of 0.7)... They replaced two Polk PSW650 vented subs with dual 10" drivers. The Polks delivered a lot of bass in the 35-50Hz range but bass was non-existent below 30Hz. The bass was very tight and was very loud, considering it only had a 250-watt amp. After building my two Daytons, there was a notable increase of bass below 30Hz, but for some reason, the mid-bass seems lacking. I have the crossover frequency set as high as it can go (~200Hz). Rerunning the auto EQ on my AVR did not make a diference.
Watching movies like Battle: Los Angeles or Super 8, I can get a lot of really low bass but it sounds like the bass above 40Hz is lacking (there is a lot of rumbling but no slam so to speak). To get the same sort of volume of mid-bass like the Polk sends the sub amps into near clipping (the lights start to turn from green to red) or the driver maxes out of excursion.
I took the RSS390HO out of the system and replaced it temporarily with a DefTech SC6000. It restored the mid-bass and some of the low-bass. What am I missing or doing wrong?
If it's not a BIG screen, it's not a theater...