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Ok. That's even more interesting, but I'm a bit confused. Can the former not just feed into the amp via RCA? Does it have to go through a DAC?
The second half of what you're saying is exactly what I want to do.
Chak-
No because the amp needs an analogue signal and the output from the streamer is digital. Check out Allo’s website, there may be a version with a DAC board included.
DACs tend to be pretty compact devices and you can hide them out of the way.
Other streamers are available but I’ve been very impressed with my Allo USBridge despite having concerns about it being complicated (I’m not a natural tinkerer). It was pretty much just plug and play. Check out some reviews.
Edit: The simplest and cheapest option might be chrome cast audio if you can find one and sound quality isn't the highest priority. That will plug straight into your amp and is supported by Roon.
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There are lots of guides on how to use a RPi but I do think it sounds like the kinda thing that would work for you.
Stevethecoffee
JB
Allo USBridge or DigiOne with Volumio software depending on whether you want USB or optical/coax connection. That goes into DAC then to amp. Install Roon or freebie similar software (you will need the computer running and connected to WiFi) then you have wireless access to everything on your hard drive with a nice user friendly phone interface.