mcnster / umc-404hd-signal-path

Signal path diagram for the Behringer UMC-404HD audio interface in .dia and .pdf format.

umc-404hd-signal-path

Signal path diagram for the Behringer UMC-404HD audio interface in .dia and .pdf format.

This is a conceptual schematic of the signal path for the behringer U-PHORIA UMC404HD Audiophile 4x4, 24-Bit/192 kHz USB Audio/MIDI Interface with MIDAS Mic Preamplifers. A sweet, sweet piece of equipment.

Included is the diagram source in .dia format. Dia is a program for drawing structured diagrams (C) 1998-2009 The Free Software Foundation, part of the Gnome Project.

Also there is a rendered .pdf file of the schematic for your viewing pleasure if you don't have access to Dia.

The source and render are both placed in the Public Domain by me in the hopes that it will be illuminating to somebody.

If I've really gotten something wrong in this schematic, create an Issue or Pull Request and I'll update it.

Shameless Plug

I am available for all your corporate and personal diagramming needs. Located in Calgary, Canada (GMT-7) and world-wide on the internet. All jobs considered, reasonable rates.

E-Mail Me (Michael)

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After silence, music comes closest to expressing the inexpressible.

umc-404hd-signal-path's Issues

Some potential additions

I just learned some things about the UMC404HD that you might want to include in your diagram.

The XLR/TRS combo input apparently treats any XLR connection as a MIC input. Signals received when an XLR connector is plugged in are not affected by the Line/Inst switch, so the signal line you've drawn is not correct.

I'm guessing that there is an internal boost to the MIC signal before it merges back into the signal path. It appears that the signal merges back before the Pad switch/ Whether you want to show the internal MIC gain on the diagram or not is up to you.

You can test this yourself: a MIC connected with XLR is not affected by the Line/Inst switch. It is affected by the Pad switch.

Another thing I learned is that the phantom power switch only sends power to the XLR portion of the connector. This is very useful to know. It means I can leave my MICs connected with phantom power enabled while also connecting line outputs from another device. As long as I use a TRS cable, there's no problem.

I hate to complicate the diagram further, but splitting out the XLR and TRS portions of the inputs might make representing both these items much easier.

Did find how to add updated stuff ...

... so I did a fork. Feel free to reuse it
Thanks

Signal path to main output

I think there's an error in the signal path to the main output. From my testing and https://www.youtube.com/watch?v=YUucqDjB2GY it seems that inputs 3-4 don't route to the main out, just 1-2. I have no idea how to diagram that properly, but it would be very useful to have it shown when you're trying to figure out the routing.

If anyone can contradict me and explain how it works differently, please feel free to. I'd rather be able to get 3-4 from the main out, and was very confused when I tried to and it didn't work.

This is the only mostly complete diagram that I was able to find, so many thanks for making it in the first place.