They are/were well-regarded transmission line speakers designed by Dr. Kevin Blair here in the Kalamazoo/Portage, Michigan. The design is based on a
q-TSAL® (quasi- Thiele/Small Actuated Labyrinth) transmission line. I believe the Amygdala may have been the best known model and was in the middle of the range - there was at least one larger model, the
Coeruleus, which one of my friends still owns. There are a couple of reviews you can find with a Google search.
I believe they did sound best with tubed amps and Dr. Blair used to have deHavilland amps and preamp in his showroom at the "factory" where they produced the speakers. The folks at deHavilland had this to say,
I believe they did sound best with tubed amps and Dr. Blair used to have deHavilland amps and preamp in his showroom at the "factory" where they produced the speakers. The folks at deHavilland had this to say,
" 1/8 Wavelength transmission line loudspeaker systems developed by Dr. Kevin L. Blair PhD. We have had the good fortune to have these speakers available to us at our CES showrooms, and the results are spectacular."Unfortunately, the business closed years ago, but not because the speakers didn't sound good, because they did. A side note is that Dr. Blair also developed Vinyl-Zyme,
"a record cleaning solution not based on alcohol solvents or surfactants, but rather, on natural enzymes derived from plants. Its enzymatic action mimics the biological digestion process to break microbial attachment of fungi and bacteria, leaving the record a non-supportive surface for those contaminants."Vinyl-Zyme is still available for purchase.