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New loudspeakers & room digital correction service
(02-Jan-2018, 18:52)timhbf Wrote: impulse response

Why do you say the S/N is very poor? If you can share a link to your .mdat REW file we can I have a look.
 Roon Air / convolution HAF / Devialet Expert D200/ DIY power and speakers cable / DIY Speakers Atohm EURUS 1.0 + DIY active SW 
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Please find my 5 measurements below, appreciate for any comments.

https://drive.google.com/file/d/11Po6_Hs...sp=sharing


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(03-Jan-2018, 04:39)timhbf Wrote: Please find my 5 measurements below, appreciate for any comments.

https://drive.google.com/file/d/11Po6_Hs...sp=sharing

Just a guess, but is the noise in the red rectangle anything to do with the signal that tells REW when to start measuring?
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Your measurements are actually noisy, even though they can be exploited to a certain extent.
Checklist :
- Have you properly configured the calibration file of the microphone in REW ?
- Have you done the "check levels" test in the preferences of REW, first tab ?
- What does the SPL read in REW during sweeps ? Should not be less than 70dB, preferably 75dB-80dB.
- Are you using Airplay ? Airplay is known to cause issues with REW, even though this is supposed to be fixed in the last version (check you have the last version 5.19 beta 7).
ON the data itself, you have a very strong resonance at 55Hz, and your early reflections in the first 25ms are a bit high, some being above the -15dB threshold "good practice", this is visible in ETC view.
 Roon Air / convolution HAF / Devialet Expert D200/ DIY power and speakers cable / DIY Speakers Atohm EURUS 1.0 + DIY active SW 
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I confirm that was Airplay issue, I've made another measurements through HDMI > Optical > Dialog, the results are much better
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