crossover function still not working after 14 years correctly

[Music or sound]

I originally bought the Premier just when it got released in the USA, likely one of the very first. The main reason for it was that it was an integrated solution and it included a crossover function. I was using analog out for the low pass (140 to 300 Hz)  feeding different class D amps for the woofers(Nilai presently) and the Devialet amp was used for my semi full range drivers above the crossover frequency either filtered or not (mostly I used it full range). I was communicating early on with Devialet about that the crossover is not performing as it should and since then nothing got improved. There is a slope at about 5dB/ octave below or above the crossover frequency and and the slope is much shallower past the crossover point. 4th order is supposed to be 24dB/octave but it looks more like 16dB.
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red no crossover, green Devialet 140hz,4th order and blue analog active cross over 140Hz/24dB slope (Xkits).
So I think it is time to look for something better.
Presently I am trying to audition different DACs/ server Mola Mola Tambaqui (with my Innuos Zenith) or Grimm MU2. That kit diy crossover ( from Kitz  also available ready made from Sublime) looks quite good but the choices of analog quality crossovers are almost not existing. Presently the is a movement to use digital crossovers (as the D250 etc have) but that means a separate DAC for each channel. That why I think a single high quality DAC and an active analog cross over would be better the some digital crossover with builtin DACs.

So any recommendations for my specific needs are appreciated

[Delija]

Devialet uses Bessel filter + you need to do the additional math:
https://devialetchat.com/Thread-Crossove...8#pid67508

[Waiski]

Yeah, simple . It still works with the same logic. But it is working.

[Music or sound]

No was never working correctly. More than decade ago I had several conversations with Devialet and they said they will improve their slopes but they never did. One can adjust the crossover points separately for high and low pass that -6dB is at the desired crossover point specific for a selected crossover order. That is only possible if one can measure the output best at the speaker. If you look at my measurement example slope is correct at 350Hz but below it it has much shallower slope no matter what Q design it is.

Anyhow after an in-house demo I ordered a Mola Mola DAC and will at least for now use that kit crossover.

[Delija]

I have 100% replicated Devialet crossover with MiniDSP Flex, using above mentioned formulas.

Are you familiar with Bessel filter?
https://www.ranecommercial.com/legacy/note147.html
https://ecstudiosystems.com/discover/tex...f-filters/

[Music or sound]

I have 100% replicated Devialet crossover with MiniDSP Flex, using above mentioned formulas.

Are you familiar with Bessel filter?
https://www.ranecommercial.com/legacy/note147.html
https://ecstudiosystems.com/discover/tex...f-filters/

 

you show quite different slopes. crossover order determines slopes in dB/octvave and alignment /Q just the shape around the crossover point. The Devialet filter is not close to any common alignment. Even they didn't deny it

[Waiski]

Correct. Devialet crossover is not Bessel. It is Dessel (Devialet style bessel with a twist) .