Those look interesting. While I might assume that the preamp quality is comparable to an SD or Zax unit since they are clearly designed and intended to be used with them, there seems to be relatively little on the web about them.
Mics: akg c460 (ck61, ck63), c414buls, c568eb; at4049a, 4051a, 4053a, at853; josephson c42; neumann U87, km84i; beyer m130, m160, m500; aea r84; gefell m71, mt711s, m200, m201; sony c38; schoeps cmc6, CMBI (mk4, mk21, mk41, mk4v); sennheiser mkh40, md421, md431, md541
Pres: API, a-designs, pendulum, purple, millennia, gt, littlebox, tinybox, usbpre2, CA 9200, pipsqueak, pueblo pending
Cables: KCY, CMR, Naiant AKG actives, PFAs, asst. GAKables and Darktrain
Recorders/converters: dr680, m10, dr-2d, d50, dr70d, zoom f8, lynx aurora 8
Yeah, I'm an attorney, but everyone needs a day job!