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In Reply to: RE: Subs are sub optimal with magenpans! posted by jrdoe on February 22, 2017 at 12:36:49
From what you describe when using the P5 bass management with the Dirac it seems that you are getting an overload of the speaker and possibly some over reach by Dirac in trying to flatten out the room.
That can be caused by the calibration measurements for Dirac when run through the P5 with your settings on the P5. Those settings may not be realistic and require lots of correction. So I suggest you optimize the P5 settings and the location of the sub and measure the FR and phase response with REW so that you do not have large corrections for Dirac to make. Then run the calibration measurements.
What you describe with the P5 in the way indicates that the mains portion of the freq spectrum is being corrected upwards to match with the sub output- which is likely being set too high on the P5.
Another option is to restrain the correction Dirac applies to the speakers to the bass fraction of the freq spectrum, say up to about 200 hz.
On a general note, the measurement of dipole speakers is not easy and setting up the measurements for the calibration you should look to average them on a squat window of about 2ft width around your listening position, not rely on a single location.
Follow Ups:
That all makes sense, but what I can't understand is why the mains are being overdriven at low frequencies when the P5 bass mgmt is supposedly cutting off the frequency at whatever I set it to (currently 50hz, but I tried as high as 80hz with the same results). Very strange...
My best guess is that the subwoofer level you prefer gives you a higher relative output vs. the mains rather than just extending the bass an octave or two, so that when you calibrate and run Dirac it tries to undo the relative output mismatch by raising the relative output from the mains. There is also the possibility that the bass phase/location (i.e. delay) is not matching well with the mains so is producing comb filtering which requires allot of correction.
That is why I suggested measuring the results with the sub and bass management with the P5 and optimizing FR with XO, level and placement before applying Dirac.
Hmmm. Now I think you're onto something. I'll bet it's the phase, as you mentioned. The Rel can output at 180degrees of phase. It would be great if it could change to any of the the 360degrees, so I could dial it in exactly. I'll experiment with this. Thank you!
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