Originally Posted by MKtheater
This seems like the idea to try however I think there is a easier solution. He has very capable mains to play midbass at reference and lower. First, I would run a sweep with the mains plus the subs and see what is happening. I bet all he needs is a crossover, phase, and/or a distance setting adjustment to fix that null near the crossover. I bet he will have phase issues with both playing and they are canceling each other out during music or movies and then makes it sound weak or thin, or whatever. I can tell you from experience going from a null at 70-90hz at my crossover to flat after adjusting the distance settings alone made it seem I went from 5 inch mains to dual 15inch jbl 2226's! Tweak and tweak some more. Nevermind the EQ yet, get that transition area perfect first. This is what Bosso was talking about, running with the mains on. Those JBL's will reinforce anything the PSA have when in proper phase and time alignment!
I've played with the following- all documented in this thread (MK- I don't blame you for not reading start to finish)
1) - Moved subs all over the room
2) - Adjusted gain settings
3) - added floor to ceiling bass traps in the front corners
4) - Adjust phase settings on both subs individually and together- found the best setting is phase on left cabinet set at 45 +1 is the best. (the right cabinet phase doesn't do much, but THE LITTLEST PHASE ADJUST ON THE LEFT CABINET makes a huge difference.)
5)Moved the LP until I got out of the nasty null. 1 ft. back is the magic spot. While one reading (EX left seat right side) s perfect except the 30=40hz peak, a spatial average gets skewed because the far right and far left produce nulls.
Current average of all LP - spatial average of left and right chairs.
Spatial average minus far left chair measure.