Thanks for the advice. I've printed out the setup instructions and plan to sit in front of the Codex with them. My other Roon endpoint is a QX-5/20 that takes Ethernet in and outputs balanced analog to the KX-5/20 preamp.
Replace Ayre Codex with Topping D90 DAC
My Ayre Codex takes USB from an ultraRendu and sends balanced analog to an Ayre A7e integrated that drives KEF LS50s. The sound level has become nearly inaudible, and I suspect it's a problem with the Codex -- substituting a microRendu made no difference; the sound level with the Ayre C-5xeMP disc player is fine. Should I send the Codex to Ayre for service or buy a Topping D90? Anyone hear the two DACs?