Deafboy
New Member
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- Oct 9, 2021
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My first post on ASR!
Recently I purchased a Denon AVR-3700H receiver based on amirm’s review of the unit and also his positive impression of the Audyssey Room Equalization system (reviewed separately) that is included in the Denon AVR-3700H. One aspect that piqued my curiosity is his opinion that the Audyssey’s room corrected response shown on the app is too good to be true (“wishful thinking”). The “after” curve shown in the app is undoubtedly a simulation based on Audyssey’s series of measurement. Jeff Clark, Director of Software Engineering at Audyssey, mentioned in a Youtube video that if one combines the 8 measurements in the exact positions where the calibration was done with the Audyssey processor enabled one would obtain the “target curve” shown in the “after” section of the app. I wondered how close this simulated response was to the real response after the room had been “Audysseyfied”. I did an experiment to verify this and would like to share the results. I’m also new to ASR so if this has been done in the past, and I am reinventing the wheel then my apologies.
Here’s a description of my experiment. My loudspeakers are late 1980’s Canadian-made Energy 22.3. I first affixed a measurement microphone right next to Audyssey’s microphone that came with the Denon (see picture below). Then for each of the 8 measurements in Audyssey’s calibration procedure I noted the position of my tripod with marks on the floor. Once the whole Audyssey procedure was done I then re-measured in those 8 positions each speaker with my microphone and REW software (Room Equalization Wizard) with Audyssey disabled (Denon’s “Direct” mode) and then enabled. So for a pair of speakers this represents 32 measurements done with REW. I used REW “RMS Average” function to combine the 8 measurements corresponding to a set in the experiment.
The results are quite revealing. The picture below shows the screen grab of the Audyssey app showing the “before” and “after” results with the right speaker. I overlaid my results taken with REW in curves below Audyssey’s for comparison, being careful to precisely scale the frequency and amplitude axes. Using a smoothing factor of 1/24 octave to best match my results to Audyssey’s, we see that Audyssey results of the un-corrected are surprisingly close to my results (curves on the left). The “After” results I obtained are certainly more jagged than Audyssey’s simulated results but I consider these impressive nevertheless.
Comments welcome.
Recently I purchased a Denon AVR-3700H receiver based on amirm’s review of the unit and also his positive impression of the Audyssey Room Equalization system (reviewed separately) that is included in the Denon AVR-3700H. One aspect that piqued my curiosity is his opinion that the Audyssey’s room corrected response shown on the app is too good to be true (“wishful thinking”). The “after” curve shown in the app is undoubtedly a simulation based on Audyssey’s series of measurement. Jeff Clark, Director of Software Engineering at Audyssey, mentioned in a Youtube video that if one combines the 8 measurements in the exact positions where the calibration was done with the Audyssey processor enabled one would obtain the “target curve” shown in the “after” section of the app. I wondered how close this simulated response was to the real response after the room had been “Audysseyfied”. I did an experiment to verify this and would like to share the results. I’m also new to ASR so if this has been done in the past, and I am reinventing the wheel then my apologies.
Here’s a description of my experiment. My loudspeakers are late 1980’s Canadian-made Energy 22.3. I first affixed a measurement microphone right next to Audyssey’s microphone that came with the Denon (see picture below). Then for each of the 8 measurements in Audyssey’s calibration procedure I noted the position of my tripod with marks on the floor. Once the whole Audyssey procedure was done I then re-measured in those 8 positions each speaker with my microphone and REW software (Room Equalization Wizard) with Audyssey disabled (Denon’s “Direct” mode) and then enabled. So for a pair of speakers this represents 32 measurements done with REW. I used REW “RMS Average” function to combine the 8 measurements corresponding to a set in the experiment.
The results are quite revealing. The picture below shows the screen grab of the Audyssey app showing the “before” and “after” results with the right speaker. I overlaid my results taken with REW in curves below Audyssey’s for comparison, being careful to precisely scale the frequency and amplitude axes. Using a smoothing factor of 1/24 octave to best match my results to Audyssey’s, we see that Audyssey results of the un-corrected are surprisingly close to my results (curves on the left). The “After” results I obtained are certainly more jagged than Audyssey’s simulated results but I consider these impressive nevertheless.
Comments welcome.
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