i'll post some initial reactions, since i just listened to the caliente / k702 for about an hour.
this is going to be a very good pairing, i think.
the woo audio wa6 i've been listening to sweetens the bass somewhat. which sounds great with some cans, but wreaks havoc on the akgs. as they have an overly tight bass presentation (some say bass light).
but, my guess is the solid state amps like the caliente give a quicker, deeper bass response. which helps fill in the punch that is so needed with the k702s. and, to make things even better, the caliente has a somewhat warmer sound than the average solid state.
hence why i bought. it
the caliente is lighter than i thought it would be. the power supply is a wall wart, which i knew... but somehow i was expecting a hulk of aluminum. but, ha, nope. it's even lighter than my tiny EF2A.
so far, my initial take is that it has even power throughout the volume knob. and i love that it doesn't have too much gain (5 or 6 dB i think?). it doesn't start getting loud until 10 o'clock or so, and isn't ear crushing loud until 2 or 3 o'clock. that's lots of usable attenuation there!
i don't know if it has enough juice for my 600 ohm beyers yet. i haven't listened. but, i sort of doubt it... that won't be a problem, as i have the woo to pair them with...