From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
A pair of early Magneplanar MG-I speakers. circa 1976.

Magnepan is a private high-end audio loudspeaker manufacturer in White Bear Lake, Minnesota, United States. Their loudspeaker technology was conceived and implemented by engineer Jim Winey in 1969.


Magnepan's speaker design, sold under the brand name Magneplanar (often referred to as "Maggies"), differs from that of conventional speakers in relying not on cones mounted in an enclosure but on a planar driver system mounted in a panel. A Magneplanar's reproducing mechanism comprises thin conductive wires and or foil strips attached to a thin sheet of Mylar residing in a magnetic field created by a vertical array of permanent strip magnets. When an amplified signal is applied to the conductors, the resultant electrical forces react with the magnetic field to excite the Mylar film sheet, which projects sound as a dipole. In principle, this approach relies on the same concept as a voice coil-driven cone speaker, but in a Magneplanar speaker the "voice coils" are attached (glued) directly to the radiating surface.

A pair of (restored) 1986 SMGa Magneplanars.

Sound is projected from both the front and back of the radiating surface. The sound from the back of the speaker is reflected from the front wall of the listening area. This is said to effectively enhance the soundstage - the sense of space and realism - of the speaker. The Magneplanar design, using a passive magnet array, is not a unique loudspeaker implementation, although it was the first of its type. Eminent Technology, Analysis Audio, and others also employ passive magnet designs. Broadly, these are classed as planar-magnetic speakers.[1]

There are other similar speaker designs to the Magneplanar. Martin-Logan and Quad Electroacoustics, among others, make electrostatic loudspeakers, which are another variation on the dipole model. Electrostatic speakers operate on a somewhat different principle. While the voice coils in the Magneplanar are conductive wires or foil strips mounted on a sheet of Mylar film, electrostatic speakers suspend a charged conductive film between two grids (stators) which move the film. One disadvantage of both designs is that a very large panel is required to produce deep bass. Magnepan has addressed this via the physical size of the speakers - a physically large radiating surface produces more bass. Martin-Logan has addressed the bass problem by mounting a conventional cone bass driver in a separate section of the speaker chassis, generally resulting in a physically smaller speaker than the Magneplanar.

The most frequently cited disadvantages of the overall design are relatively low efficiency and, given the absence of an enclosure, difficulty in reproducing very low bass frequencies.


Model Type Technology Freq. Response Sensitivity Impedance Size Production Years
Magneplanar MMG Floor Stander 2-Way / Quasi-Ribbon Planar-Magnetic 50 Hz-24 kHz +/- 3db 86db / 500 Hz / 2.83v 4 ohm 14.5 x 48 x 1.25 inches 1995–Present
Magneplanar 1.7i Floor Stander 3-Way, Full-Range, Quasi-Ribbon 40 Hz-24 kHz 86db / 500 Hz / 2.83v 4 ohm 19 x 65 x 2 inches 2010–Present
Magneplanar 3.7i Floor Stander 3-Way, Full-Range, Ribbon Tweeter 35 Hz-40 kHz 86db / 500 Hz / 2.83v 4 ohm 24 x 71 x 1.625 inches 2013–Present
Magneplanar 20.7 Floor Stander 3-Way / Ribbon Tweeter - Quasi-Ribbon 25 Hz-40 kHz 86db / 500 Hz / 2.83v 4 ohm 29 x 79 x 2.062 inches 2011–Present
Magneplanar 30.7 Floor Stander 4-Way / Ribbon Tweeter - Quasi-Ribbon 20 Hz-40 kHz 86db / 500 Hz / 2.83v 4 ohm 2017–Present[2]




  1. ^ Fantel, Hans (24 March 1985). "Sound; a Flat Loudspeaker Delivers Well-Rounded Music". The New York Times. Retrieved 22 February 2019.
  2. ^ Martens, Chris. "Magnepan 30.7 four‑panel dipolar planar loudspeaker system". Hi-Fi+. Retrieved 17 February 2019.

External links[edit]