QUATTRO mkII, built by Robert/US
Copyright 2016 © Troels Gravesen

Dear Troels,
I've given the Quattros a good break in and I've got to say that these are some of the finest speakers I've ever heard.   If I had to use one word to describe the sound, it would be "detail."  The sound is very clean and new details are heard on recordings I have heard many, many times or were so much less apparent on lesser speakers that I never paid them much attention.  These details are creating a whole new listening experience requiring old albums to come of the shelf "to hear what is there."  For example, I put on Gerry Rafferty's "Right Down the Line" and discovered the two-different wood blocks and triangle that alternate from right channel to left channel throughout the song.  I knew that sounds were part of the song, but now it was as if the two percussionists were standing directly in front of me taking turns measure for measure.   These details are simply more "present" than on other speakers I own -- even my Gallos, B&Os and B&Ws. 
The build was a very enjoyable endeavor and to come away with this  quality of sound makes for double reward for my efforts.
Here is a photo of one of the finished Quattros.  The stand was made from the non-rotted pieces of red oak plywood that I took of a trailer  that my engineer/father built 40 years ago. 
Best Regards
Robert Dunkelman