The 3.7 is a 3-way design, like the 3.6, but, it is a full-range ribbon design, like the highly acclaimed 1.7. The specifications of the 3.7 are nearly the same as the 3.6, with a minor increase in efficiency.
Freq. Resp. 35Hz- 40 kHz
Sensitivity 86dB/500Hz /2.83v
Impedance 4 Ohm
Dimensions 24 x 71 x 1.625 inches