Current BETA implementation is as a DAC and amp. iDevice in, USB in, line input, Headphone and line output. Bass boost, and 2 gain positions. It has a clean, detailed, articulate sound (so far - BETA unit, sound signature not finalized yet). It currently has enough gain to drive my PM-1's and Alpha Dogs on low gain.
Mike - You just have to decide the most neutral way of doing so. I have not spent a lot of time with the XC, just 15 minutes or so at a meet. I came away feeling the sound signature of the Alpha Dogs was my preference over the XC's. I suspect the Alpha Prime house sound will have me feeling roughly the same about the Primes. However.... My XC experience is meet conditions, unfamiliar rig, noisy, trying to be critical, and being well familiar with the AD's, and...
For portable with the Alpha Dogs, I've used:
HIFI-M8 - Killer set up, for a portable. Just to darned big for me.
iBasso PB2+ DB2 - also killer for a portable set up, and a bit more portable than the HIFI-M8. I kinda wish I hadn't sold this rig.
HRC Microstreamer - Sounds nice, reaches a passable listening volume, doesn't get loud. Not the best choice. Stunning with iems and efficient phones though.
Oppo HA-2 beta unit. So far, so good. This is a beta...