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Post by zealott on Nov 12, 2020 16:51:44 GMT -5
Ok, so have run Dirac a couple of times. Good room (XMC-1 with Dirac was brilliant!), sound-proof, symmetrical, bass-traps etc... Running with XPA-1's for front (B&W 802D) I cannot seem to get a good centered sound, one the first run the Dirac favored the left speaker, and on the second run it favored the right speaker. Both speakers have same output when measuring with an SPL meter both before and after calibration (test-tone). Anyone else experienced this and have thoughts? (attached image from Dirac that shows the two front-speakers) Attachments:
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Post by ttocs on Nov 12, 2020 17:02:48 GMT -5
My Right Front speaker is 1dB to 1.5dB lower than the Left, but it's every time. Electrostatic speakers confuse things a bit, plus, the Right speaker is in a corner and the Left is in the middle of the front wall, so I'm guessing Dirac is sensing something. I've absorbed the corner with 3' on the front wall and 4' on the side wall, so I'm not doing any more.
Sounds like your issue is erratic, which makes it tough to figure out.
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Post by zealott on Nov 13, 2020 17:06:08 GMT -5
Yea, I’ve tried to re-run the first measurement 10 times today, with 10 different results. If I move the XMC-2 mic 2 inches the sound could easily be centered a few feet to either side. The sound itself is really good, it’s just not centered...
Tried resetting all, pre-leveling the speakers, changing mic center position. Will try a Minidsp-mic (umic) this weekend to see if that helps at all.
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Post by ttocs on Nov 13, 2020 17:38:11 GMT -5
Yea, I’ve tried to re-run the first measurement 10 times today, with 10 different results. If I move the XMC-2 mic 2 inches the sound could easily be centered a few feet to either side. The sound itself is really good, it’s just not centered... Tried resetting all, pre-leveling the speakers, changing mic center position. Will try a Minidsp-mic (umic) this weekend to see if that helps at all. Try just a one point measurement. Just one set of sweeps. When you try to proceed to the next step there will be a message asking "are you sure", just say yes and it'll let you go to the next screen and finish the filter. Do this several times to find out if the results are the same or different each time. With this knowledge you will be able to choose the path to finding the erratic element. And just to ask the obvious, the mic is placed in the Main Listening Position first and selecting the center dot in Dirac, correct? This is where the timing is measured. |
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Post by zealott on Nov 15, 2020 8:43:20 GMT -5
Thanks for the tip, this is what I have discovered...
Main listening position first, obviously and center dot.
Equal distance from both front speakers.
Uncorrected (with user or reference direct) sound is centered, levels are all 0.
Dirac consistently puts sound-center to the right, I need to reduce right speaker by 4db to get it centered again.
I tried with the first measurement as you mentioned (omitted the warning). I've done this about 10 times, and 9 out of 10 had the same outcome.
Speaker curves are almost identical, both measured and corrected. Corrected impulse shows a lag to one of the sides, but uncorrected is quite similar.
Mic is the supplied EMM1 mic, with the curve downloaded from Emotiva Dirac page.
I've tried with 2.0 only setup now (no subs etc).
Any suggestions?
Thanks,
John
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Post by ttocs on Nov 15, 2020 10:05:42 GMT -5
Thanks for the tip, this is what I have discovered... Main listening position first, obviously and center dot. Equal distance from both front speakers. Uncorrected (with user or reference direct) sound is centered, levels are all 0. Dirac consistently puts sound-center to the right, I need to reduce right speaker by 4db to get it centered again. I tried with the first measurement as you mentioned (omitted the warning). I've done this about 10 times, and 9 out of 10 had the same outcome. Speaker curves are almost identical, both measured and corrected. Corrected impulse shows a lag to one of the sides, but uncorrected is quite similar. Mic is the supplied EMM1 mic, with the curve downloaded from Emotiva Dirac page. I've tried with 2.0 only setup now (no subs etc). Any suggestions? Thanks, John You will get really good help by posting this in: The Official Dirac Live Thread : G3P (start w/posts 1,2,3)
If you are getting consistent results with single point runs then there's got to be a reflection somewhere that Dirac is interpreting incorrectly. |
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