The Codex, as you know, is a really nice DAC. Moved up to the QX5/20 to better it’s performance. I’m sure you have reviewed the manual but again you may want to ensure it has not been set into the volume controlled mode as opposed to straight through “DAC” mode. And if you have used any headphones try plugging them in and unplugging again. The if the Codex erroneously senses the headphones to be still plugged in it reduces output significantly. Rick
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?