FYI, what comes around goes around. I hooked up Bozak B-302A Urban’s to a Volumio-rpi2-hifiberryAmp+ and the sound is amazing! Hoffman iron law says the physics makes the loudspeakers big if you want sensitivity (= efficiency, or loud with low amp wattage) with low end bass response then the enclosure must be large. The Urban’s are 2’ cube “bookshelf” loudspeakers @75lb each. Back in the day (1940-50’s) before high power amps this was how audio was done. Later SET 1-5 watt amps and low wattage mono tube amps (one for each stereo channel) became quite the thing when using these hifi high sensitivity loudspeakers.
It is quite funny to see the small box pushing these big speakers and making 115db+ crystal clear sound. Haven’t hooked up a Klipschorn (has anyone else) but I have my eyes on a pair of Chorus ll’s.
With so much sound (sonic energy) coming from a system like this total digital fly-by-wire control can be scary when sw bugs occur. A dedicated Griffin powermate volume/mute knob may make sense for a more direct digital control.