Magnepan Magneplanar MGIIIA loudspeaker Specifications

Sidebar 2: Specifications

Description: Three-way planar-magnetic bass and midrange system, with ribbon tweeter. Bass driver: 620 square-inch planar magnetic. Midrange: 170 square-inch planar magnetic. Tweeter: ¼" W by 57" L by 0.0001" thick ribbon. Crossover: 18dB/octave low-pass Butterworth at 300Hz, 6dB/octave high-pass at 800Hz, and at 3kHz between midrange and treble. Frequency response: 37Hz-40kHz ±4dB. Power recommendation: 50W minimum, 200W maximum. Impedance: 4 ohms in the bass, 3 ohms in the treble, pure resistive. Sensitivity: 83-85 dB/W/m.
Dimensions: 23" W by 72" H by 2" D. Weight: 52 lbs per side.
Price: $2250/pair (1986); no longer available (2003—the current version of the MGIII is the MG3.6/R, reviewed by Brian Damkroger in August 2000).
Manufacturer: Magnepan, 1645 Ninth Street, White Bear Lake, MN 55110. Tel: (800) 474-1646. Web:

1645 Ninth Street
White Bear Lake, MN 55110
(800) 474-1646