Not for Tekton bashing as I believe they make a pretty good inexpensive speaker. I owned a pair of the Perfect-SET speakers. They may have not been quite as efficient as advertised, however they were efficient and sounded pretty darn good over-all. $-for-$, they are tough to beat. I sold them as there was an obvious dip in the upper mid-range frequencies, which in comparison to my Living-Voice OBX-RW's was brought out however those speakers were $12K+ when new 11 years ago. All in all, if I hadn't had the L-V speakers, I may have not noticed the mid-range dip in the Perfect-SET Tektons. They had great bass and were noticeably more-efficient than my L-V's... Great speakers for rock & roll !
By the way, I also had several pairs of ZU speakers and none of them I believe were rated very accurately in terms of actual efficiency, especially the Soul-Superfly version I had. Was actually tougher to drive than the Druids...
John