Perhaps the most unheralded strength of both the CX and the PX is that they have really incredible power conditioners built right into them.
If you have less than perfectly clean AC power, it's no problem with the DACmini CX or PX or even with the DACport and DACport LX. CEntrance put a lot of attention into literally re-manufacturing the power coming into these units. The first hint of this is that the CX and PX can be powered by your choice of any voltage ranging from 9V to 19V. How is that possible?
There's a team of little hard-hat wearing nanobots inside that separate all of the incoming electrons and stack them up in a big pile from which some more nanobots clean and polish them, then put them on a conveyor belt where yet more nanobots reassemble the electrons into exactly what each of the isolated DAC and analog circuits need to make clean, pure, music for your headphones!
Just kidding, of course, but seriously - compare the CEntrance design philosophy to the Beresford Bushmaster or Caiman DAC/amps and you'll understand why Stanley Beresford can sell his stuff for so much less - and - why you have to power the Beresford gear with a battery pack to enjoy a low noise floor.
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I'm still using my DACmini CX almost daily, to drive a battery-powered TBI Millennia MG3 speaker amp and Definitive Technology SM45 near-field monitors - which, together, present a very, very detailed, clean, and neutral reproduction of anything I pipe into the CX.
I don't like listening to music with a laptop in front of me, so I use this setup as my auditioning station lately - where I use Tidal HiFi to find new music, marking favorites, creating playlists and such, for later playback at my recliner, with my more expensive HD800 setup, and without a laptop keyboard tempting me to surf and check email and such, instead of just relaxing and getting into the music.
Unfortunately (for the sake of my very patient and gracious wife) the table in formal dinging room has been my audio work bench for over four years now.
Here's how it typically looks - but the clutter changes rapidly - I'm sitting in front of a royal mess right now, as I type this.
I will likely never sell either my CEntrance DACmini CX or my Centrance LX. They are marvelous tools.
Mike
but man...gotta say i do not prefer it for my hd800's but my umpro50's... dear lord i do now believe in witchcraft and whatever centrance is doing in that tiny little silver box is surely the work from a seasoned dark arts doer. the bass punch, slight increase in highs comparative to the darker ish sounding umpro50's just make the entire back in black cd sound like something i haven't heard from before. i have been apart of this hobby for years and i have to say that i haven't felt an emotional attachment to the music like i have now listening to the CX since my dad left me in his truck while he inspected a c-5 hercules (not abuse- i was not allowed in there any more as i touched/moved/played with anything and everything and lockheed did not approve) this made time for me to simultaneously kill my fathers truck (didn't understand the truck needed to be running in order to prolong audio nirvana) and listen to this very acdc album at pretty much ear bustlingly high levels and loved every second of it... until it died, at max volume, and i could see my dad walking back to the truck apparently already angry because no one ever checked one of the engines for operation. anyways- thanks centrance- people never forget the way you made them feel and you made me feel like a scared ****less 11 year old about to get his ass tore up for killing his fathers truck and lying about listening to the music without it cranked like he asked me not to do- the proof was when he started it and the music was still turned up to the same level. i tore up his speakers and he tore up my ass. its okay though i told my mother and he slept on the couch for leaving me in the living room 
