Good morning… i love Volumio… thank’s to the team!
Question… can i use the raspbarry pi 3 whitout DAC i2C but use my USB Denon’s dac?
My Denon PMA 1600ne there isn’t into list but with volumio 3 on beelink bt3 it’s all right. Now for my second HiFi system I’m interesting to use raspberry pi3b QC 1,2 GHz 1gb ram … It’s a good hardware?
it seems only pc / mac support at denon…
better go pi4 2gb same price…
Please add it to the compatibility list then. 
Your RPi3 (don’t know what you meant by QC) should run Volumio fine, but personally I would think twice about using it with a USB DAC (usb and ethernet handled by the same components … have a Google). Having said that, people do use such a combination. This potential problem has been sorted on the RPi4.
Can you post the link to buy?
it seems that the price in italy is a bit higher around 60/70 euro…
here a link in my country see the difference :
https://tweakers.net/pricewatch/1414468/raspberry-pi-4-model-b-2gb-ram.html
QC, probably quad core?