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The other options I've left myself is to put another PS-1000 or similar size sub in the opposite side of the stage, or do an IB
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An additional (similar or same) sub will simply add headroom, not extension...... go with the IB, or maybe an SLLT......
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When it comes to integrating with the mains, what would be the key things to look for when interpreting the graphs?
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Watch at and around the crossover frequency for dips and peaks. The best method is to take a few measures with a phase adjustment between each measure and look at the 90Hz area (and below and above somewhat) and see which position of phase gives the best results. You can also look at different seating positions also to see if you've messed up......
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once the mains are introduced, would it be too late to introduce a house curve of some flavor?
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No problem, but looks to me as though you have an OK house curve there already at most positions. The house curve would require the introduction of the BFD into the system. Personally, it doesn't look like you need one. Why introduce ADC/DAC's, level and dynamic range problems if it's not needed?
More often than not a room will offer up a common resonant peak of various amplitudes over a wide range of listening positions. Even though each listening position offers its own unique response, there can be a common resonance that shows up if you lay all the measures on top of each other using the All Measured or Averaging tabs in REW. Then it's very beneficial to use a BFD to counteract that common mode. You simply don't appear to have that problem with your room (no doubt due to your careful planning). Overall, each position looks fairly good. I just don't see the need to get into EQing your sub when your goal is a decent response over a wide listening area. There are tradoffs to adding EQ. When you don't need it, then avoid it.....
brucek