• Registered: 2024-12-20
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Topic: adi 2/4 4 different channel digital input at 192khz

hi there,

i am thinking about how to get the acoustic quality and options of the adi 2/4 for my setup which is currently a 2.1 setup where i delay the subwoofer by about 6ms.

so since this is apparently not possible natively using the adi software (no delay function implemented), the only option i see here is to pass the digital signal via adat and spdif AT THE SAME TIME @192khz to the adi.

i am not sure if that is possible; i know those channels can do 192khz at stereo only, so no way to send lets say 2x2 via adat only.

the question is: is that a feasible approach? making ucx ii master clock should at most give some static very subtle 'offset' between adat (one stereo pair for monitors) and spdif (one stereo pair for the subwoofer).

is that possible? did anyone do this yet? thanks ..

rme fireface ucx II, velodyne spl-x 10, supra eff-isl, genelec 8030c
  • waedi
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Re: adi 2/4 4 different channel digital input at 192khz

I would connect the sub directly to the UCX ll instead to the ADI.

Or you come down with the sample rate to 48 or 96

M1-Tahoe, Madiface Pro, Digiface USB, Babyface silver and blue

3 Reply by KaiS (edited by KaiS 2026-04-16 07:25:20)

  • KaiS
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Re: adi 2/4 4 different channel digital input at 192khz

Have a look at manual chapter 17.5 Digital Through Mode.

You can not use Optical and Coax at the same time, but:
You could use AES as a secondary input to access channel 3/4.
This even means 192 kHz sample rate is possible.


What sounds strange to me is, you delay the sub.
A low pass filter incorporates a delay by it’s own, so further delaying the bass does make it slow, laggy.
You might still achieve a good frequency response (if that’s what you’ve been after), but get a very bad impulse response.

If your sub has continuous phase control, try to use it to tune the sub/main transition instead.

KaiS's Website

4 Reply by MC

  • MC
  • MC
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Re: adi 2/4 4 different channel digital input at 192khz

It is possible with ADAT (aka SPDIF optical) and AES. SPDIF plus SPDIF is not supported, either coax in or optical in can be used as SPDIF source. Luckily the AES input can use SPDIF coaxial signal, see ADI manual.

Edit: KaiS beats me again...

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Matthias Carstens
RME

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  • Registered: 2024-12-20
  • Posts: 26

Re: adi 2/4 4 different channel digital input at 192khz

thanks for your information !!

but i am afraid you cannot then route those out independently, meaning

ADAT -> Out 1/2
AES -> Out 3/4

independantly from the adi will not work right?

so mapping this

ucx ADAT out 1ch1/2 -> adi ADAT in ch1/2 -> adi XLR out ch1/2
ucx AES out 1 ch3/4 -> adi  AES in ch3/4 -> adi TRS out ch3/4

is not possible, is it?

yes kais, you are right .. i put it wrong. obviously the monitors are delayed, not the sub. it is a velodyne spl x 10, which i can recommend without getting paid for it. it is is a fantastic subwoofer. but it has an internal delay of about 5.7/5.8ms.

rme fireface ucx II, velodyne spl-x 10, supra eff-isl, genelec 8030c

6 Reply by KaiS (edited by KaiS 2026-04-16 16:02:37)

  • KaiS
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Re: adi 2/4 4 different channel digital input at 192khz

christian s. wrote:

… i am afraid you cannot then route those out independently, meaning

ADAT -> Out 1/2
AES -> Out 3/4

ucx ADAT out 1ch1/2 -> adi ADAT in ch1/2 -> adi XLR out ch1/2
ucx AES out 1 ch3/4 -> adi  AES in ch3/4 -> adi TRS out ch3/4

is not possible, is it?

I only can repeat myself:
Yes, 1/2 and 3/4 independently feed, one from SPDIF (Optical OR Coax) and the other from AES, works:
Have a look at manual chapter 17.5 Digital Through Mode please.

KaiS's Website

  • Registered: 2024-12-20
  • Posts: 26

Re: adi 2/4 4 different channel digital input at 192khz

ah sorry if i did not get it. thank you. that is a very nice feature to enable 2.1 functionality in conjunction with ucx ii or totalmix in general .

rme fireface ucx II, velodyne spl-x 10, supra eff-isl, genelec 8030c
  • Registered: 2024-12-20
  • Posts: 26

Re: adi 2/4 4 different channel digital input at 192khz

the only reason i think about this is because i cannot add delay in the adi 2/4 to a channel. but i guess this is not a very common use case .. if that was possible, one could use adi 2/4 only without another totalmix device enabling the delay function. and having fletcher-munson as a function in totalmix would also be interesting, as a settings option so to say: define a range, a 0 point (-40db or so), and then a curve for the compensation.

rme fireface ucx II, velodyne spl-x 10, supra eff-isl, genelec 8030c

9 Reply by KaiS (edited by KaiS 2026-04-16 23:45:36)

  • KaiS
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Re: adi 2/4 4 different channel digital input at 192khz

christian s. wrote:

… and having fletcher-munson as a function in totalmix would also be interesting, as a settings option so to say: define a range, a 0 point (-40db or so), and then a curve for the compensation.

If you are using ADI-2 for volume control, you can have Loudness Compensation (what you call Fletcher-Munson) in ADI-2, synchronized for 1/2 and 3/4 by using the same settings and the same relative “Low Vol Ref” level.

Volume control 1/2 - 3/4 can be synced with an offset by selecting “Dual Volume”.

Nice side-effect:
The IR Remote controls volume (of course ) and can activate/deactivate Loudness with a dedicated button.

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