The Ayre Codex DAC is in current production while the Ayre QB-9 DSD DAC is not.
The sound quality of my Codex DAC is excellent and I suggest you give it listen. I have used my Codex DAC as a DAC and its sound quality was excellent. In addition, I also have used the Codex DAC as a pre-amp with great results. I am currently using my Ayre Codex DAC in my 2 channel home theatre system with the Ayre AX-7e integrated amplifier.
Several years ago I had the Ayre QB-9 DSD DAC and believe the Ayre Codex DAC sounds better but, of course, everyone has a different opinion on this. I suggest you audition the Ayre Codex DAC.
The sound quality of my Codex DAC is excellent and I suggest you give it listen. I have used my Codex DAC as a DAC and its sound quality was excellent. In addition, I also have used the Codex DAC as a pre-amp with great results. I am currently using my Ayre Codex DAC in my 2 channel home theatre system with the Ayre AX-7e integrated amplifier.
Several years ago I had the Ayre QB-9 DSD DAC and believe the Ayre Codex DAC sounds better but, of course, everyone has a different opinion on this. I suggest you audition the Ayre Codex DAC.