Optimizer for both impulse and frequency room response on multiple subwoofers with MiniDSP2x4HD

[Statman2022]

I've been playing around with my MiniDSP2x4HD and four subs to simultaneously optimize both frequency response and impulse response. I wrote an optimizer to simultaneously optimize for both. This is what Dirac Live does for speakers, and possibly for subs with Dirac Live Bass Control (DLBC), but I haven't used DLBC since my receiver only has one sub output. For my optimizer I used both the MiniDSP's IIR and FIR filters. Below are the results in terms of frequency, phase, and impulse at three different locations in my room (Center, Left, and Right side of the couch).

You can see that not only is the frequency response flatter, but the phase response is smoother, and hence the impulse response is more peaked, with less loud oscillations before and after the peak.

Would anyone be interested in trying out something similar on their system? I can try taking measurement files and running the script, but I was thinking of eventually creating a GUI if enough people were interested. This would be useful for anyone with multiple subwoofers and MiniDSP2x4HD who doesn't have DLBC, but I'm also interested to try in a system with DLBC to see how it compares.

 

[Harryharryharry]

I could be interested in using something like this. I'm just about to get another sub and have a Minidsp Flex.

 

[BrianSexton]

I've been playing around with my MiniDSP2x4HD and four subs to simultaneously optimize both frequency response and impulse response. I wrote an optimizer to simultaneously optimize for both. This is what Dirac Live does for speakers, and possibly for subs with Dirac Live Bass Control (DLBC), but I haven't used DLBC since my receiver only has one sub output. For my optimizer I used both the MiniDSP's IIR and FIR filters. Below are the results in terms of frequency, phase, and impulse at three different locations in my room (Center, Left, and Right side of the couch).

View attachment 399780
View attachment 399781
View attachment 399782
You can see that not only is the frequency response flatter, but the phase response is smoother, and hence the impulse response is more peaked, with less loud oscillations before and after the peak.

Would anyone be interested in trying out something similar on their system? I can try taking measurement files and running the script, but I was thinking of eventually creating a GUI if enough people were interested. This would be useful for anyone with multiple subwoofers and MiniDSP2x4HD who doesn't have DLBC, but I'm also interested to try in a system with DLBC to see how it compares.

I'm interested.
I have a living room setup, lots of acoustic compromises.
Have done a bunch of tunes on my 4 sub alignment using Rew.
Just started experimenting with MSO, and the Allpass filters make a huge difference...and I don't have a clue how to design those on my own.
One thing that is happening with my Mso tunes, is the sub that is physically the farthest away is getting the biggest delay.
I haven't re-measured since the tune, but I suspect the time response of the system is paying the price for frequency response.

Maybe there is a delay limit somewhere in MSO?
Not super familiar with it yet.

 

[bachatero]

You can't actually optimize for either the impulse or frequency response because the frequency response is literally just the Fourier transform of the impulse response by definition. So, it's a win-win!