FOR SALE: Ayre Acoustics Codex DAC "A truly Magical Music Experience"

Review: http://www.hifiplus.com/articles/ayre-codex-dacheadphone-amplifier/

GREAT PART OF ANY AT HOME SYSTEM
You can use the Ayre Codex equally as a stand alone DAC, headphone amp, or digital preamp.

FULLY-BALANCED CIRCUITRY
A fully-balanced signal path throughout the analog circuitry provides an inherently clean and quiet backdrop for your music. The zero-feedback design maintains all of the pace and rhythm of your favorite artist, rendering your digital music as effortlessly as if it were live.

Balanced circuitry is a special dual configuration that rejects noise and interference—not only from external cables, but also from the AC power line itself. In an Ayre component even the signals from conventional sources are converted to the balanced format, resulting in vivid, lifelike performances, presented against an uncannily quiet background.

ZERO-FEEDBACK DESIGN
Conventional designs use negative feedback to compare the output signal to the input signal, which introduces time-domain errors and other artifacts. In contrast, Ayre's exclusive zero-feedback circuits are designed for intrinsically pure linearity, delivering performance that is coherent and natural.

To get the best possible sound from the USB input of your Codex please refer to Ayre's computer audio setup page.

“I don't know if it's due to the 'zero negative feedback' design or the killer digital filters Charlie Hansen dreams up, but with file resolutions of PCM up to 32/384 and DSD128 the Codex is just plain musical. Can't wait to get one up here for a long hard listen. ”

– Tyll Hertsens, innerfidelity.com