I switch between my quad 306 and Mini-1 on an almost daily basis.
The mini-1 is running off a 12v SLA motorbike battery and to my ears creates a depth of soundstage and seperation of instruments the 306 just can't match. My 306 isn't factory standard either, it's had a full reworking inside but even like this, I prefer the mini-1.
Granted the 306 has more slam and and can be listened to for hours on end with no fatigue whatsoever. I love both to be fair but the bulk of my listening gets done on the mini-1.
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Current system:
RPi + Allo Digione
Beresford Caiman Seg & Dorado powered by 15v Linear PSU
Transcendent Sound Mini Beast OTL
Amptastic Mini-1
Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
110aH Leisure Battery powers the Mini-1 & Digione