Originally Posted by IMWhizzle
AustinJerry, I’ve sent you the MDAT file by PM.
My observations, based on your MDAT. By the way, in the future you should add a description to the measurements, because I don't know which speakers are being measured.
Typically, frequency response variations under 5dB are considered very good. I see a minor issue in the low frequencies centered at 50Hz, which might be corrected by re-positioning a subwoofer. The top curve is reasonably flat, while the bottom curve has a small issue at 450Hz. Overall, I think the response is quite good.
Looking at the Spectrogram, any "plumes" that extend above 450ms to 500ms are indicative of bass ringing. On the waterfall, look for "ridges" that consist of tightly-spaced lines that originate at the top of the waterfall and extend downwards for at least 20dB. Both of these graphs indicate that your room might benefit from bass treatments. I would focus on resonances above 40Hz, because resonances at lower frequencies are extremely difficult to control or eliminate.
The ETC graph you posted did not show the detail needed to interpret the data. The guideline for reflections is to eliminate any reflections that are above the -20dB line within the first 20ms. "Measurement 4" shows a significant reflection between 3 and 4ms, and several others in the 13-16ms range. These reflections extend to -15dB, and should be reduced to -20dB at least. "Measurement 1" is slightly better, with on reflection at 5ms, and several other minor reflections. Overall, I don't see a major issue with reflections, and do not understand where
is arriving at his conclusion, no disrespect.
And finally, speaker alignment:
Measurements 1 and 2 show perfect alignment, using the Impulse Overlay. Measurement 3 is showing a very slight alignment of .08 Inchers, which is .01 cm, clearly well within the acceptable range, and most likely smaller that the speaker distance adjustment that is possible on your AVR. No concerns with time alignment whatsoever.
In summary, your audio shows to be quite good based on the measurements. You would likely benefit by addressing bas resonances as your first priority, and then identifying the source of the several specular reflections, and finally adjusting speaker placements to achieve the flattest response.