The first question on everyone's mind-- "How is the 3.7i 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.
The introduction of the 3.7 during CES 2011 was very similar to the introduction of the 1.7 during CES 2010. In their show coverage, www.theaudiobeat.com
summed up the reaction of many who heard the 3.7 at the Audio Research and Magnepan rooms-- "In terms of high-end audio in early 2011, we don't know of a more important and impressive debut than that of the 3.7."
Editorial on 3.7s and Magnepan's CES demonstration begins in second column of link below. Gary Reber states--
"These are without question the best performance/value in loudspeakers that I have experienced. American-made throughout, these high-resolution, full-range ribbon, planar loudspeakers set a new benchmark for high-fidelity performance in loudspeaker design. No other demonstration at the CES came close to the sonic and spatial realism, and seamless response and time coherence delivered by the Magneplanars!"
In the link below, note that Jon Valin slipped in some words about the 3.7 in his coverage of loudspeakers priced at $25,000 pair (and up). Debuting new products in hotel rooms is risky business. Jon later heard the 3.7s at the Magnepan room at T.H.E. Show (Pink Flamingo). Jon is a veteran Maggie reviewer and will have a pair of 3.7s to test in the same room and conditions where he reviewed the 1.7s.
See the last paragraph in the following link.
In the link below, meet the new president of Magnepan, Mark Winey, to continue the family tradition with the 1.7 and 3.7.
SYSTEM DESCRIPTION: 3-Way True Ribbon Tweeter, Planar-Magnetic Midrange and
Bass with Bi-Amplification Option
BASS SECTION: 500 Sq. In. Planar-Magnetic
MIDRANGE SECTION: 199 Sq. In. Planar-Magnetic
TWEETER SECTION: 5/32 Inch Width, 55 Inches Long FREQUENCY RESPONSE:
**34Hz to 40kHz ±3dB
POLAR RESPONSE - RIBBON DRIVER: 180° Horizontal dispersion both front and
back to 20kHz
RECOMMENDED POWER: 75 to 250 Watts RMS (8 Ohm rated). SENSITIVITY:
88dB, 500Hz, 2.83Volts
IMPEDANCE: Bass- 4.7 Ohms
Midrange/Ribbon Tweeter- 4.2 Ohms Ribbon Tweeter- 3.3 Ohms
CROSSOVER: Crossover between bass and midrange is 200Hz
Crossover between midrange and tweeter is 1700Hz