Originally Posted by bori
So after I do that when I run audyessy do I have the XO engaged?
To run the eq to flatten out the final response of how the subs interact with each other in the room, here's what I would do:
--With the sub off, calibrate the MBM to the same level as the speakers
--With the MBM off, and the subs' xo switched off, calibrate them to the same level as the MBM and the speakers (since you have two, run them at the same time for calibrating, but when adjust so the gain knob is same for both of them)
--The above two steps match the level of the two subs to the same level, because you are matching their output at the same frequencies in the sub test tone
--Engage the subs' xo, turn all subs on, and calibrate the combined output of the sub and the MBM to match the level of the speakers
--Run the auto-eq
--Re-run the test tones to see if you need to readjust the sub level based on the auto-eq making cuts to frequencies (which will bring down your overall sub SPL level). You may not need to do this if part of the process includes setting the speaker/sub levels automatically as well.
You can eq individual subs separately, but when you introduce the output from all the subs, it probably won't be flat anymore due to the acoustics of the room and how the frequencies boost or cancel each other out at different spots in the room. That's why you eq the combined output.
I don't have an MBM, but when I eq my sub (3.2) manually, I run the test tones through the receiver so it goes through the main speakers and the sub. Otherwise I could eq the sub flat, but it wouldn't be flat once the bass from the mains is combined with it (due to the crossover slopes).