ayre must have shot themself in the foot and then tried to cover it up. although i feel their method of "covering it up" is unfair. since many people may now not see what they need.
see, they removed the pc usb driver from all codex pages of theirs. they put a driver for the qx-5 twenty on it's page. lo-and-behold that driver works with the codex. not only that but the sound quality is vastly improved. over an already competent dac. closing the gap betwen the codex and qx-5. obviously they did not want this to happen so their effort was to make it tricky to find the driver. ymmv on this. the qx-5 is still a better dac than the codex no doubt but really only worth it if you require a digital media center/preamp. go try these drivers! uninstall yours first. reboot. if upon it says to unplug your dac please do so. it also upsets me ayre with this expensive gear were to cheap to buy the newest streamlength drivers. that is shameful honestly. the new one works splendid for me. the seperation and soundstage, prat all just tripled. this is obviously why they did not want people to find it. it is the same driver but the install methods are rewritten for higher efficiency. it is sad though that the $9,000 qx-5 is running on a 5 year old driver.
alsi i am pretty sure the headphone output on both of them is from the ess dac chip not the rear output of the units. that would explain a similar sound through headphones. the 9018 is 8 years old but it is time tested. obviously the 9038 has better specs but specs do not mean everything.. stlil only supports 2x dsd which in a $9,000 dac would not sell me.
anyways i heard it and the diamond dac v with power base is much better at much more money and it is just a dac. sems ayre is jumping on the apple bus. the codex on the other hand with these drivers is a great bargain. watch now they see this and remove the driver entirely. i would snag it while you can. ac has a used debussey which i feel would be a much better choice so long as you do not need an "entertainment center". that is what jriver is for and vastly superior at that. i am not bashing it it was just not the bargain to me the codex is(especially with these drivers) since all i care for is a "dac". it seems companies are forgetting that word. i could care less about headphone jacks, roon, tidal, volume control etc. that is just me though. the qx-5 may be right up someone elses alley. it is a top class dac don't get me wrong. just not my cup of tea. however the codex is and remains so. keep it simple stupid.
feel free to disagree. this is my opinion it is fine if anyone elses is different. right now, imo the codex is the king bargain. easily beating many $5k plus dacs. throw in these drivers and i would say it literally doubles the performance.of an already competent dac.
one thing if you do snag these drivers make sure to use them in wasapi exclusive mode. i would not say wasapi is better than asio it's a tossup but on these specific drivers it is a lot better imo.
they just accidentally narrowed the margin and obviously realized it. of course this is only with usb usage. fancy crystals and such also require good software to drive them.
also, of course there is science and voodoo. i do not need crystal oscillators from the moon. well, they just did not sell me on this one. the codex is most cetainly the sweet spot. you all should be happy since this a codex thread but i am sure i will get flamed. at least be sure to try out the drivers.