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Home→Tags DUPLEX

Tag Archives: DUPLEX

Great Plains Audio 604-8H III Rev. 2 Duplex

Great Plains Audio Posted on August 7, 2017 by GPAAugust 7, 2017
GPA 604-8H-III-Rev-02

The Great Plains Audio 604-8H III Rev. 2 is more than just an evolution in the classic series of 604 Duplexes, it’s an AUDIO REVELATION! For more than fifty years, there has been one studio monitor loudspeaker that has been … Continue reading →

Posted in Featured GPA Products | Tagged 604-8H III, DUPLEX, Great Plains Audio

Altec Lansing 604-8K Duplex Studio Monitor

Great Plains Audio Posted on July 24, 2017 by Jeff MarkwartJuly 25, 2017
Altec 604-8K

In early 2008 I had the opportunity to evaluate a loaned Altec Lansing 604-8K utilizing the CLIO system. The driver was an early unit (serial # 3403, date stamped DEC 1982) and was equipped with the original factory low frequency cone and … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged 604-8K, Altec-Lansing, DUPLEX

Phase Correction for Altec Ferrite Duplexes

Great Plains Audio Posted on July 24, 2017 by Jeff MarkwartJuly 24, 2017

Ferrite Magnet 604s As I mentioned on the Home Page, horizontal separation between voice coil gaps for ferrite magnet Altec Lansing 604 & 904 duplexes is 2.8125”. This distance produces 112 degrees of phase shift between the driver’s acoustic centers at … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged 604, Altec-Lansing, DUPLEX, Phase Correction

Altec-Lansing DUPLEX Speakers

Great Plains Audio Posted on July 21, 2017 by GPAJuly 22, 2017
Original Altec-Lansing 604

Altec Lansing invented the first DUPLEX® Loudspeaker System in 1941 (some sources say 1943 – we’re really not sure). Called the “601”, it was of the field-coil type and included a small-format HF compression driver mounted to a 12″ low … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Todd W. White's Corner | Tagged 604, Altec-Lansing, Altec-Lansing 604, DUPLEX
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Great Plains Audio, The Engine, Pascalite, “The Legacy Lives On”, and the Little Maestro are trademarks of Great Plains Audio, Inc. Altec, Lansing, Altec Lansing, Voice of the Theatre, and Duplex are registered trademarks of Altec Lansing Technologies Corporation. Iconic, Tangerine, and Mantaray are registered trademarks of the Iconic Manufacturing Company, LLC. University Sound is a registered trademark of the Telex Corporation. Symbiotik is a registered trademark of the Altec Corporation. JBL is a trademark of Harman International.

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