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July 24, 2017November 3, 2022

Phase Correction for Altec Ferrite Duplexes

By Jeff Markwart 604 / Altec-Lansing / DUPLEX / Phase Correction

July 24, 2017November 3, 2022

Altec-Lansing 604-8H Crossover Revelations

By Jeff Markwart 604-8H / Altec-Lansing / Great Plains Audio

Altec-Lansing 604B

July 24, 2017November 3, 2022

Phase Shift Between Drivers

By Jeff Markwart 604B / Altec-Lansing

Original Altec-Lansing 604

July 21, 2017November 3, 2022

Altec-Lansing DUPLEX Speakers

By GPA 604 / Altec-Lansing / Altec-Lansing 604 / DUPLEX

Altec-Lansing-M500-Maestro

July 21, 2017November 3, 2022

The Altec-Lansing Model 19-MR3: The Loudspeaker That Never Was

By GPA Altec Model 19 / Altec-Lansing / M500 Maestro

Altec Stonehenge III

July 21, 2017November 3, 2022

DIY Altec-Lansing Stonehenge III

By GPA Altec-Lansing 604 / Stonehenge III

Stevens Dream Altec 604 Loudspeaker

July 21, 2017November 3, 2022

Stephæn’s Altec 604 Dream Speaker

By GPA Altec-Lansing 604 / Great Plains Audio 604

GPA N1200-8A crossover

June 11, 2016November 8, 2022

New N1200-8A crossover

Great Plains Audio announces the release of our NEW N1200-8A crossover, which can be...

By GPA N1200-8A crossover

About Us

Great Plains Audio was born out of the Altec Lansing corporation in 1998. It carries forward the loudspeaker design and manufacturing tradition that began with Western Electric in the early 20th century. Great Plains Audio is the only place where the legendary Western Electric/Altec Lansing sound reproduction technologies live on.

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7127 Northwest Third St. Oklahoma City,
Oklahoma, USA, 73127
405-789-0221