Cheap, Portable Pres/AD/DA to pair with an RME Digiface USB?

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I am interested in buying an RME Digiface USB for a portable rig, to play guitar and vocals, as well as some MIDI instruments. In my home studio I am using an RME RayDAT with a bunch of 8 channel preamps, as well as separate MIDI I/O, and a big monitor controller on my desk. I got so used to the insane performance and latency of the RME setup, hence why I want to start with the RME Digiface USB as the core component of my portable system. I'd like to get something small to pair with it

Ideally I want something with:
  • ADAT I/O with the ability to slave to the RMEs superior clock (ofc)
  • OR - SPDIF I/O/slave that uses the optical connector (not coax)
  • At least 1 microphone preamp
  • At least 1 separate Hi-Z guitar input (not bound to the same channel as the mic)
  • Ability to route the analogue inputs directly to the optical outputs
  • Ability to route the optical inputs to at least 1 stereo pair of analogue line outputs, ideally with some kind of main out volume control knob
  • At least 1 headphone amp, fed by the optical inputs also, ideally with its own volume control
  • Preferably MIDI I/O over USB2, though this is not essential
  • DC Power is fine, or power over USB, not too fussed
  • Decently fast AD/DA converters, since low round trip latency is one of my priorities
I dont care if the device is old, discontinued etc. If it has the kind of routing I am looking for, its not really essential that the device even have USB, though that would be nice just to use it as a MIDI IO device and leave the Digiface as the audio driver. If it does have USB it should be USB/MIDI compliant and work with modern Macbooks (eg M1 2020 or later)

I know I can get lots of big full rack width 18 in out this that and the others, but I really want to keep it small and portable. Something I can throw in my bag with my Macbook and the Digiface. As far as the quality of the pres, etc, I am not super obsessive. For example in my home studio I use an ADA8200 with the RayDAT, with no major gripes.

I have been looking at some discontinued Edirol/Cakewalk stuff, the UA-101, UA-25EX, UA-4FX etc, and they seem like they might fit the bill, but I am honestly not sure. I am wondering if there is anything old from MOTU, EMU, etc. It is often hard to find info on older products, and even harder to find if they would work in this kind of ADAT/SPDIF optical slave mode

Any advice or suggestions on portable, budget friendly, small devices that would suit my needs would be greatly appreciated
Last edited by matthewjumps on Wed Jul 26, 2023 3:30 am, edited 1 time in total.

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Arturia AudioFuse Studio? I’m using a pair of AudioFuse 8Pre’s with my Digiface USB.

I really can’t think of many portable ADAT preamps that have ever been made.

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Thanks but that costs $1500 AUD, in which case I might as well just get an RME Babyface brand new.

I am looking to get something budget friendly, likely second hand, on top of the new RME Digiface I will buy, which is $650. Ideally I want to keep the total cost under $1000.

And I know that the old Edirol/Cakewalk stuff I mentioned, the UA-101, UA-25EX, UA-4FX etc, all have ADAT or optical SPDIF I/O, are quite cheap, and are in the small portable form factor. In fact lots of older gear from 10+ years ago has these kind of features. I am just not sure
a. If they are any good and
b. If they are, or can be routed the way I need and
c. If they can still connect to modern macs etc

So mostly I am looking for advice on repurposing older gear to be the AD/DA/Pre/Monitor control of a Digiface

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If you haven’t bought the Digiface USB yet, I would probably not do so. Get the Babyface or something similar. Maybe something like a MOTU Ultralite?

I do not believe there is a whole lot in the portable preamp space that also has modern driver support.

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Search for 2 channel preamps with digital or spdif out.
- connect on an optical input on Digiface and set to spdif

I think ART got something.

Here is one thread about that
https://www.thegearpage.net/board/index ... t.1982704/

but there are loads of responses just using search engine of some sort.

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Someone on SoS forums recommended the ZOOM U-44, and on paper it seems to fit the bill exactly, since it is:
  • Small, portable, USB powered
  • Two mic/line inputs
  • Hi-Z on input 1
  • Standalone AD/DA mode
  • MIDI I/O (which seems to work even in standalone mode)
  • SPDIF optical input and output
There is some uncertainty about the routing of the digital IO when in standalone mode, I will make a new thread just to ask anyone who owns that unit how it works

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I don't know what "portable" means here, but...
I find optical connectors not very sturdy. I wouldn't want to unplug them often (it's not just the cable connector that gets damaged easily).

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