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HiFi Berry DAC+ Pro Now with XLR
- Thread starter watchnerd
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That is one cute looking little board!
Say, and I know this sounds odd, but is this one of the DACs I got talked into buying???
Say, and I know this sounds odd, but is this one of the DACs I got talked into buying???
Whatever the answer before, clearly now it is "yes". 
My problem is that it is probably buried in the hundred other boards I have bought in the last few months that I have lost track of!
@watchnerd what are you impression regarding the XLR version? I just order one, as at this price point it was the only option to create Roon bridge that feeds active monitors.
Veri
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That's cool.
somebodyelse
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This one, in beta test at the moment? Documentation's sparse to say the least. Why is this better than using a Pi Zero to do the usb to i2s conversion at 1/5th the price?
That card will present itself as an USB audio device when plugged to PC USB port. Not the case with Pi Zero.
somebodyelse
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You can configure the Pi Zero as a usb audio gadget and it'll appear as a UAC2 audio device to the PC. It'll even get its power over USB. On the Pi Zero the PC looks like a USB audio source. You can pass this direct to the i2s audio device, or do some processing in between, such as passing it through BruteFIR. The limitation is that audio gadget mode currently presents only one bit depth and sample rate to the PC. You have to unload the gadget module then reload with the new settings if you want to change, and the PC will see this as the audio device effectively being unplugged and plugged in again.
Ok, I didn't know that - very interesting! How exactly do you configure this "audio gadget" mode?
somebodyelse
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The generic OTG/gadget setup is covered in Andrew Mulholland's Gist. It doesn't detail the g_audio module options for setting the bit depth and sample rate though. You'd use something like:
That will create a capture interface at 192kHz 32 bit (4 byte) and a playback interface at 48kHz 16 bit. I don't remember which perspective capture and playback are from though - I suspect from the Pi.
There was a patch set for specifying the rate and size as a comma separated list - I don't know whether this has been accepted upstream though. It wasn't in the Raspbian kernel last time I tried it. There's also some work on presenting a UAC3 interface.
I've only tried this connecting to a linux PC, but so long as you only use one gadget module at a time it should work with Windows.
Code:
sudo modprobe g_audio c_srate=192000 c_ssize=4 p_srate=48000 p_ssize=2There was a patch set for specifying the rate and size as a comma separated list - I don't know whether this has been accepted upstream though. It wasn't in the Raspbian kernel last time I tried it. There's also some work on presenting a UAC3 interface.
I've only tried this connecting to a linux PC, but so long as you only use one gadget module at a time it should work with Windows.
somebodyelse
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I don't think so - as I understand it that port is connected to a usb hub that in turn connects to the ethernet and USB A sockets on the various B models. The power socket may use a micro-B on those, but it's just a power socket. It might work on the Pi 4 as I understand the Type C socket is connected to an OTG interface on the processor, and the mistaken resistor wiring identifies it as an audio device.
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