Every single one of THIEL’s principles of design reached their peak after years of focused development in the CS3.7. This time, all new approaches tackled age old problems.

The journey began with a new approach to driver diaphragm rigidity. Midrange and bass drivers evolved from multi-layer executions to increase rigidity into a single thin aluminum membrane with undulating radial waves. Voice coil diameters were maximized to limit the unsupported area, and the results were drivers with extraordinarily wide bandwidth that didn’t reach breakup modes until way beyond their operating bands.

Cabinet construction evolved from thick, heavy flat panels with up to 4 inch thick front baffles to curved plywood walls with machined aluminum front baffle and top.

Crossover design, of course, continued to be acoustic first order, but the network had so much better signal to manage due to advances in the above driver developments.

THIEL’s 3 series always birthed the greatest innovations. Model 03 was THIEL’s first time and phase coherent design. The sculpted front baffle of the CS3.5 enticed the purchase of our first CNC router and featured our first drivers with copper pole sleeves. CS3.6 expanded THIEL’s short coil / long gap motors beyond tweeters, multi-layer driver diaphragms, aluminum cones and extensive use of passive radiators in reflex designs. Unlike the trickle-down trope, THIEL’s innovations radiated outwards from the middle of our line centered on the 3.

Jim imagined the same would be true with the CS7.3 eventually building upon the CS3.7s innovations in a larger truly full range package.

For those of us who crave detail, spaciousness and transparency, CS3.7 is the ultimate loudspeaker. It is distinctively THIEL while introducing radical new solutions to age old problems wrapped in a highly evolved style.