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RME User Forum → Miscellaneous → UCX 2 with Raspberry Pi DAC Pro
I'm working on a project which is based on a raspberry dac pro https://www.raspberrypi.com/products/dac-pro/
What's the best way to connect it to my UCX 2?
I don't see any way to do so, except analog out to in, but that seems a tad pointless. What are you trying to achieve?
According to the information
- From the webpage: "[...]and supports balanced/differential output in parallel to phono/RCA line-level output. It also includes a dedicated headphone amplifier."
- From documentation: Analogue out (0–2V RMS via P7).
Wondering how this DAC delivers a balanced signal with cinch outputs, which has only ground and a hot signal.
For balanced operation, you need ground and the hot signal in different polarities /+/-) and the circuits for balanced operation.
I would simply connect it to an analog line-level input on your UCX II and use a Cinch to TS cable.
https://www.thomann.de/de/cordial_cfu_15_pc.htm
You can use any analog input; I would use the analog inputs 5-8 on the rear, then the cables are not in sight
and then the analog inputs 1+2 can still be used for mics and 3+4 for instruments ("Hi-Z").
Regarding reference level
With the reference levels you control the input sensitivity of the analog input on the UCX II.
UCX II supports +19 and +13 dBu.
+19 dBu makes the input most insensitive, supporting hot studio signals.
You can use a digital gain (0-12 dB) to increase the sensitivity if +13 dBu is not sufficient to get a decent input signal.
The documentation tells the max output on the module is 2V RMS, this is around +8 dBu, peaks can be higher.
So with +13 dBu or +19 dBu you will find good settings for reflevel.
If the input signal is still too low with +13 dBu, then add digital gain.
P.S.: Good morning, Daniel. You posted while I was still typing.
thank you very much, I'm monitoring audio from a drums software, that's why getting the best dynamics out of it it's important. I plan to record as well and use my throne thumper to feel the hits of my electronic drums.
Wondering how this DAC delivers a balanced signal with cinch outputs, which has only ground and a hot signal.
For balanced operation, you need ground and the hot signal in different polarities (and the circuits for balanced operation).
It supports it if you use the optional XLR board shown below it.
some products that have 4 analog outputs can be configured to combine those into 2 balanced outputs (for example V3 Sound Modules), that's probably what is meant here with "differential output in parallel". But I guess normal TS-RCA are good enough, if the distance is only up to a few meters apart.
Then again, there are (slightly pricier) raspberri heads for spdif or aes/ebu. Or it could be an option in cc-mode to connect a Pi directly via usb.
p.s.: I'm also building a machine for drums software, but I'm going the x64/PCIe route rather than ARM, but I would be interested how good the RaspberriPi is for this use case, especially latency-wise.
some products that have 4 analog outputs can be configured to combine those into 2 balanced outputs (for example V3 Sound Modules), that's probably what is meant here with "differential output in parallel". But I guess normal TS-RCA are good enough, if the distance is only up to a few meters apart.
Then again, there are (slightly pricier) raspberri heads for spdif or aes/ebu. Or it could be an option in cc-mode to connect a Pi directly via usb.p.s.: I'm also building a machine for drums software, but I'm going the x64/PCIe route rather than ARM, but I would be interested how good the RaspberriPi is for this use case, especially latency-wise.
Yes that's what I'm using a TS-RCA cable since the raspberry is just beside the ucx 2. As for CC mode, I tried it but couldn't route the main signal to outputs 3/4 which are used to feed my throne thumper and also the latency increased a bit.
Latency wise is, believe me, realer than real, .4ms at 16 buffer size. Here is the project drumpi.com
I set it at +19 dBu with 2 gain and sounds good with phones at -18
from drumpi.com:
For example, a decent snare sound can easily be made up of hundreds of files. We couldn’t just let you upload all those WAV files through DrumPi's web interface and hope for the best — we needed graphical software to visualize the samples, check their alignment, review how their tails are cut, and fine-tune details like that.
okay, the memes about the perfect snare sound are real 
but yeah, seems like a logical approach and I honour that. But I'm just wondering what would be necessary to archieve that low latency with a less proprietary solution (they state it won't work after March 2025). From what I read so far, a typical RPI and DAC module in ideal conditions reach 3-5 ms.
RME User Forum → Miscellaneous → UCX 2 with Raspberry Pi DAC Pro
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