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ObsessiveCompulsiveAudiophile / AudysseyOne

Audyssey MultEQ calibration optimization with REW API
https://www.youtube.com/watch?v=iU1ZBsru76M
MIT License
69 stars 8 forks source link

Issue with Crossover Calculations #1

Open cpage-pivotal opened 8 months ago

cpage-pivotal commented 8 months ago

Heights.ady.json

I've attached my .ady file. Running AudysseyOne with this file gives me some odd crossover settings:

6:34:51 PM [INFO] Pinpointing optimal crossover frequencies...
6:34:51 PM [INFO] Crossover frequency for C is set @ 40Hz
6:34:51 PM [INFO] Crossover frequency for FHL is set @ FULL RANGE <= 20Hz
6:34:51 PM [INFO] Crossover frequency for FHR is set @ 180Hz
6:34:52 PM [INFO] Crossover frequency for FL is set @ FULL RANGE <= 20Hz
6:34:52 PM [INFO] Crossover frequency for FR is set @ FULL RANGE <= 20Hz
6:34:52 PM [INFO] Crossover frequency for SLA is set @ FULL RANGE <= 20Hz
6:34:52 PM [INFO] Crossover frequency for SRA is set @ FULL RANGE <= 20Hz

For example, here's an ady measurement for my surround right speaker:

image

It's obviously struggling below 60 hz, while my subwoofer is confident in that range:

image

It doesn't seem logical that AudysseyOne would recommend FULL RANGE crossover for these speakers. Is this a bug?

ObsessiveCompulsiveAudiophile commented 8 months ago

I am trying to understand how is your front height speakers, especially the right one is going flat all the way down to 9Hz!!!

Subwoofer also has a huge dip between 55Hz and 150Hz. You should consider moving it elsewhere in the room.

You might wanna re-run Audyssey calibration and use closer microphone positions. 10-15 cm around the MLP is enough. They seem to be more than 1.2m apart.

If you can get rid of the SW dip below 80Hz, you could crossover every speaker at 80Hz which is THX standard since your speakers have very different bass responses.

cpage-pivotal commented 8 months ago

I agree the front height speaker is surprising. I went back and took a fresh set of measurements through Audyssey to double-check, and got the same result. These are my height speakers: https://us.kef.com/products/ci200rr. They claim to extend to 33hz (+-6db), and the front right is in a corner, so it may be getting some room gain.

I re-ran AudysseyOne with the fresh measurements, and got nearly the same crossover recommendations. For the Front Height Right, which extends low, it recommended a 180hz crossover! And for the fronts and surrounds, it recommended full-range.

Again, looking at the curves for the surround speakers, I can't see why it would conclude they were full-range. I'm happy to set the crossovers myself to 80hz, but I'm wondering if the algorithm could be improved.

ObsessiveCompulsiveAudiophile commented 8 months ago

If both pairs show same very high XO frequencies then they might really be crossed over that high as they are both rolling off by 24dB/octave at that frequency and any lower XO level will cause a NULL response between these frequencies but with larger speakers, if one speaker shows up oddly high XO freq and the other doesn't, the app will xo them both at the lower freq anyway. That's why I left it as is so that the user can see, one of the speakers have a major dip and maybe take physical measures to fix it. But it's not giving confidence to the user to see such differences between the pairs and you have a point. I will look into what could be done about that.

On Sat, 16 Mar 2024 at 17:10, Corby Page @.***> wrote:

I agree the front height speaker is surprising. I went back and took a fresh set of measurements through Audyssey to double-check, and got the same result. These are my height speakers: https://us.kef.com/products/ci200rr. They claim to extend to 33hz (+-6db), and the front right is in a corner, so it may be getting some room gain.

I re-ran AudysseyOne with the fresh measurements, and got nearly the same crossover recommendations. For the Front Height Right, which extends low, it recommended a 180hz crossover! And for the fronts and surrounds, it recommended full-range.

Again, looking at the curves for the surround speakers, I can't see why it would conclude they were full-range. I'm happy to set the crossovers myself to 80hz, but I'm wondering if the algorithm could be improved.

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