aad is the latest venture of phil jones, who's something of a legend of speaker design--he was involved with acoustic energy, boston acoustics (when they were a major player) and platinum audio, and i think, soliloqy. his trademark is getting bass response from small enclosures and using metal cone woofers. all the speakers of his that i've heard are inefficient (they really need power) but have nice balance and lots of thwack, with a very good low end. i've owned both the platinum studios (very good) and the platinum solos (great). i haven't heard his aad stuff, which is rarely seen around his parts; it looks like like the q series was aads middle line, with his top end stuff being extremely expensive; i haven't read any bad reviews and surprised at the poster who "just knows" they have bad sound quality. personally, on the strength of the designer's reputation, and depending on price i might take a flyer on the q50s