I have a pair of these which Stefan built for me a few years back in my study system. They are in basic birch ply with black Corian baffles . Not only do they look the business but they sound magical.
They are driven by a pair of Les's M130's wth Naim 72 pre with Avondale 821A cards. Sources are computer workstation with RME 9632 sound card, Lin Karik2, Rega P5, Raspberry Pi /moOde audio player
Sony CDR W33R, recapped MDAC etc etc.
I used a pair of Harbeth P3 ES2 with a Dynaudio 250 sub for several years before I bought the Ergos and was quite happy with the sound.
The upgrade to the M130's and the Ergo's have almost made the sub redundant but I keep it switched on just for those extra low notes
These little Ergo's are really great speakers and punch way above their weight. My main system has Yamaha 1000M's as delivery devices which I have been happy with for over 37 years
What I like about the Ergo's is that they reproduce female vocals really beautifully and match the Yamahas in the mid range very credibly.
I almost stretched to the Harbeth M30.1 but space was an issue and the cost was way higher
Just my 2p's worth
eddie