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Post by markusv2 on Dec 14, 2013 14:52:59 GMT -5
I've removed the inputs from the power amp, switching only the speaker i wanted to measure I wouldn't do that. In "All Stereo" the UMC-200 sends the processed signal of L or R to the surrounds. That's a bug. Use stereo and L out then simply swap cables.
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Post by markusv2 on Dec 14, 2013 15:15:10 GMT -5
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Post by neo20013 on Dec 14, 2013 15:23:21 GMT -5
I've connected UCA202 L out to L in and do a loop back measurement., removed the Right RCA's, and measure :
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Post by neo20013 on Dec 14, 2013 15:43:14 GMT -5
Markus, thank you very much for all the help. Its not easy to digest all this information I will have to get back to this measures in the next days !
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Post by markusv2 on Dec 14, 2013 15:44:16 GMT -5
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Post by neo20013 on Dec 14, 2013 16:22:25 GMT -5
Are you speaking about the soundcard measure, as this ?
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Post by markusv2 on Dec 14, 2013 16:42:10 GMT -5
^ Looks good. Now loop back the right channel and use it as a timing reference. Check "Use loopback as timing reference" in REW preferences. And, switch from 1/6 smoothing to 1/48.
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Post by neo20013 on Dec 14, 2013 16:58:27 GMT -5
Ok, i will make those changes in the next measures. Thank you very much for all the help, and sorry if sometimes i don't understand right away
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Post by whovous on Dec 14, 2013 20:03:55 GMT -5
Can I jump in here for a moment? I am planning to play with the UMC-200 PEQ function soon, and am a bit behind neo20013 on the learning curve.
I have a UMIK-1, a tripod, and REW installed on a Windows8 laptop. Do I need an SPL meter as well, or is there a workaround with what I have?
I've recently upgraded my home system and moved it into a quite small room and look forward to seeing just what I can achieve with REW.
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Post by neo20013 on Dec 14, 2013 21:20:12 GMT -5
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Post by whovous on Dec 14, 2013 23:34:51 GMT -5
I hoped that was the case. Thanks.
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Post by neo20013 on Dec 15, 2013 11:23:38 GMT -5
Markus, unfortunately, i will not have the time to take proper measures in the next days. Nevertheless, could you please answer this specific questions? Theoretical, it would correct the huge peak in the 70-90Hz region ... 1 - I've used the default SPL chart and REW to try to predict what filters i could use with PEQ, and REW came with the following filters : Do you think it could lead to better results than using the FLAT setting? 2 - In the speaker settings, there is the crossover selection for the individual speakers, and also the subwoofer crossover. I can t fully understand the relation between the subwoofer crossover and the individual speakers crossover. In my last receiver there was only a subwoofer crossover, that i understood as : - LFE (.1) is fully send to the speakers; - All the soundtrack below the crossover point would be sent to subwoofer - As such, the subwoofer would play : LFE + soundtrack bellow crossover point. As the UMC-200 has individual speaker crossovers, my understanding is that it enables to send the soundtrack part specific to each speaker, that is bellow the crossover part, to the subwoofer. If this is correct, i don't understand the purpose of the subwoofer crossover ... Could you please try to clarify it ?
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Post by markusv2 on Dec 15, 2013 11:39:25 GMT -5
1) Can you please pot your .mdat? 2) There is no subwoofer crossover one could select independently from the speaker crossover. Emotiva mislabeled "LFE" as "subwoofer". This is a bug. "Subwoofer" crossover and slope is simply the low pass filter and slope for the LFE channel. It should be set to 120Hz.
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Post by neo20013 on Dec 15, 2013 11:58:07 GMT -5
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Post by markusv2 on Dec 15, 2013 13:19:52 GMT -5
That looks pretty bad. Very long reverberation times. Even if you get the frequency response smoother, the long reverberation will swamp everything. Is this a basement with rigid walls? The drop above 6kHz needs some investigation. Maybe the speaker is damaged. What model is it? The measurement named "DEFAULT" is a single speaker + sub?
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Post by neo20013 on Dec 15, 2013 13:42:49 GMT -5
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Post by yves on Dec 15, 2013 14:42:51 GMT -5
Yes, those SPL meters are only accurate in the low frequencies. Getting an USB UMIK or similar USB measuring mic won't let you achieve accurate measurements of mid/high frequencies either. (This is because you really need a two-channel ADC for that, so that you can connect the mic to one channel and a loopback cable to the other channel). Time to invest in a Cross-Spectrum Labs calibrated Dayton Audio EMM-6. www.cross-spectrum.com/measurement/calibrated_dayton.html
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Post by markusv2 on Dec 15, 2013 15:50:30 GMT -5
The DEFAULT measure is both L/R speakers + sub. Please just measure single speakers. Regarding the 6Khz, could the problem be the lack of precision by the SPL meter? Could be but the steep drop is suspicious, even for a cheap SPL meter. Ethan Winer did a comparison: realtraps.com/art_microphones.htmIf you want to do measurements not just at low frequencies then get a calibrated mic.
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Post by marcolpt on Dec 16, 2013 7:35:32 GMT -5
Thank for sharing with us ..
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Post by neo20013 on Dec 16, 2013 8:55:09 GMT -5
So far, i have received a lot more than i've given
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