The first question on everyone's mind - "How is the 3.7 different?"
It is easier to start with what is the same. The frame and cosmetics are the same, with one important difference - the additional option of aluminum trim.
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. We are calling it "trickle-up" technology. The concepts that worked so well in the 1.7 were incorporated in the 3.7.
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