(google translate) I have had several pairs of reputable compact DIY speakers and for me the ones that really stand out and benefit the most from a technically impeccable design and great listening accuracy are these:
pkaudio.webnode.cz

SB17 D2604 :: Pkaudio
Drivers: SB Acoustics SB17MFC35-4, Scan Speak D2604/830000 (jeden magnet)Impedance: nominal 4Ohm, minimal 3.8Ohm na 140HzSensitivity: ~86dB/2.83V/1mFrequency -3dB: 45HzEnclosure: net volume 20l, bassreflex, 40Hz