Can you please describe your use case more verbose to understand the demand.
You started telling that you want to record 16 analog channels.
I am wondering why you need 192 kHz.
What type of audio is this? For what purpose do you need 192 kHz?
Then I am wondering what kind of processing your need.
Normally you work in a DAW, there you use either a VST or external HW either as "insert" (per track) or as "send" for multiple tracks (e.g. reverb) which is more efficient (less processing).
If you connect external devices, you need the same number of analog inputs/and outputs.
What I absolutely do not understand from your description, why I asked for more information,
why you say that the amount of output channels would duplicate.
What is the purpose? To where are you sending the processed signals?
Normally you would mix and master .. why do you need the double amount of outputs.
Your setup and requirements are not clear to me.
I would like to understand what you are doing there otherwise I feel like getting only half of the information.
Then I can not make a good proposal.
If you say you need quad speed (192 kHz) I would like to know for what reason.
Because quad speed has an impact ... you loose a lot of channels, because 4 channels need to be multiplexed to get the bandwidth for quad speed. So at the end only 25% of your MADI channels are left.
1 MADI Bus = 64ch at single speed, 32ch at double speed, 16ch at quad speed.
What I also do not understand is, why you think you could work without a DAW and why you think that you do not need more than the effect section of TM FX. It does not make sense to me that you raise high requirements of 192 kHz sample rate but on the other hand a fix set of effects in TM FX is all that you need for processing.
I also do not understand, what your expectation or requirements are in terms of Room EQ.
Why do you intend to use Room EQ for so many output channels?
Normally you would EQ the stereo sum of your channels and Room EQ is normally there to drive your active monitors.
But why you seem to think you need Room EQ for the double amount of your channels or even more?
Sorry, but without any further information I have a bad feeling to not get to the essence of your requirements, whats needed for what exact purpose. At the moment everything sounds a bit strange to me.
In some places you have already jumped to conclusions. You seem to think that you absolutely need AVM/Ethernet because of the cable length. When using multimode transceivers, MADI not only supports 100m as with Ethernet, but with Multimode fiber (the default offering) up to 2km between each individual device, which can also be connected in series.
On special order (for devices without SFP) you can even get single mode which supports even 10km between each of the devices in a serial chain.
So, it could also be possible that 192 kHz is not really a hard requirement here. So why don't you tell us exactly what you have in mind instead of assuming things are already set in stone. Perhaps there are other possible solutions or better solutions than you might think at the moment.
So please make your setup and use cases more clear / understandable.
A little drawing is also welcome for illustration purposes. Thanks.
BR Ramses - UFX III, 12Mic, XTC, M-1620 Pro D, RayDAT, ADI-2 Pro FS R BE, X10SRi-F, E5-1680v4, Win10