What speakers are you planning on driving with them? What’s your rough budget?
Assuming it’s for a second system / background music, these could all fit the bill:
- Bluesound PowerNode
- Sonos Amp or an old Sonos Connect:Amp (neither can be grouped with RAAT zones, but the older Sonos Connect:Amp can be picked up very cheaply as they no longer work with the newer Sonos app but work fine with Roon)
- If you’re up for some basic DIY then a RRi4 + HiFiBerry Amp2 or Amp100 HAT + Ropiee is a low cost RAAT option, ideal for ceiling or patio speakers.
Some other suggestions on this thread…