Great Vintage Loudspeakers

Great Plains Audio’s 390-Series of high frequency compression drivers are designed to give excellent audio reproduction within their rated bandwidth at very high output levels extremely high efficiency. When used with constant-directivity, multicellular, sectoral, or other appropriate horns, our 390-series of high-frequency drivers provide excellent frequency response within it’s rated bandwidth. Primarily designed for voice-only reinforcement in large outdoor systems, our 390-series of high-frequency drivers provide excellent clarity and articulation at high levels in ball parks, race tracks, stadiums, and is ideally suited for voice warning systems. ‘

Superior Voice-Range Reproduction

All high frequency compression drivers consist of three basic parts: (1) the diaphragm; (2) an acoustical transformer (also known as a phasing plug); and (3) a motor (the magnet). All Great Plains Audio high frequency compression drivers are designed and built using the finest engineering methods and materials to the highest manufacturing tolerances in the industry.

The focal point of our 390-series of high-frequency drivers is the diaphragm/voice coil assembly, the design of which is critical to accurate sound reproduction. Even though many manufacturers today try to claim they have discovered a superior method of high-frequency reproduction, Great Plains Audio has chosen a different paradigm. By utilizing only the finest, time-tested materials and manufacturing methods in the construction of it’s high-frequency section, including: (1) a single-piece phenolic diaphragm with roll suspension; and (2) a voice-coil of 2.88-inch edgewound copper clad aluminum ribbon, our 390-series of high frequency drivers are able to produce superior voice-range reproduction at extremely high levels over extended periods of time.

In order to assure that the sounds being generated by the diaphragm leave the loudspeaker in proper phase alignment, the 390-series use our exclusive RADIALWAVE™ phasing system, which ensures maximum high frequency reproduction while maintaining proper phasing and smooth overall response to 7 kHz.

Finally, a powerful magnet structure combines these other two portions of our 390-series of high frequency compression drivers together and transforms them into a system that reproduces the sound in a clear, natural manner. Each 390-series high frequency compression driver has an efficient magnetic structure utilizing a 6.87-pound ferrite magnet with a flux density of 18,500 gauss.

Working in tandem, the diaphragm, RadialWave™ phasing system, and the small yet powerful motor structure ensure that the Great Plains Audio 390-series of high-frequency drivers are capable of uniform, peak-free reproduction within their rated bandwidth at extremely high levels, thus making them the choice as the high frequency components in large sound system environments where high output is also desired.