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Tag Archives: Altec-Lansing

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Alnico Magnets and Degaussing (Losing their magnetic field)

Great Plains Audio Posted on July 27, 2017 by GPAJuly 29, 2017
Regaussing Woofers

Alnico magnets, by their nature, are easy to degauss (demagnetize) with drive. They will not change with time and their dependence on temperature is really small – maybe 1% at 100 degrees Fahrenheit. Alnico stability and resistance to back EMF … Continue reading →

Posted in Great Plains Audio Announcements | Tagged Alnico, Altec-Lansing, Degaussing, Demagnetizing, Magnets, Remagnetizing, Service

Altec Lansing Valencia: Improving a Classic

Great Plains Audio Posted on July 26, 2017 by GPAAugust 5, 2017
Altec Lansing Valencia

The Altec-Lansing Valencia 846B is an American audio classic that inspired the development of the legendary Model 19. It shares many similarities with the newer and larger Model 19. There were two versions of the Valencia: the 846A and 846B. … Continue reading →

Posted in GPA's Vintage Altec E-Zine | Tagged Altec-Lansing, Santiago, Valencia

Altec Lansing Model 19 Cabinet Plans

Great Plains Audio Posted on July 25, 2017 by Jeff MarkwartJuly 25, 2017

Follow the links below to download and print sections of the Vintage Altec Lansing Model 19 Cabinet Plans for use in your wood shop. Refer to the Model 19 Cabinet Plans page for NOTES that accompany the plans. Altec Lansing Model 19 Front View Altec Lansing Model 19 … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged Altec-Lansing, Cabinet, Model 19

Altec Lansing VOTT from Sound Practices Magazine

Great Plains Audio Posted on July 25, 2017 by Jeff MarkwartJuly 25, 2017

Here are two articles I contributed to from Sound Practices magazine. They are reprinted here with permission from Sound Practices. Sound Practices, Vol. 1, #4, Altec “Voice of the Theatre” Speakers for Hi-Fi Sound Practices, Vol. 1, #9, Horns Revisited … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged Altec-Lansing, Voice of the Theatre, VOTT

Altec Lansing Compression Driver Rear Loading Caps

Great Plains Audio Posted on July 25, 2017 by Jeff MarkwartJuly 25, 2017

In the spring of 2008 I was loaned a pair of Altec Lansing Super Duplex 604E for testing and research about possible crossover improvements. Unfortunately, one of the drivers had sustained damage to a compression driver binding post during shipment, … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged Altec-Lansing, Compression Driver, Rear Loading Cap

Altec-Lansing 604E Super Duplex

Great Plains Audio Posted on July 25, 2017 by Jeff MarkwartJuly 25, 2017

I received an unexpected opportunity to perform electro-acoustic measurements on a pair of 604E Super Duplex speakers in early 2008 thanks to a long-time owner seeking improvement in their sound. He had been using the original Altec Lansing N-1500A series … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged 604E Super Duplex, Altec-Lansing

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 604-8H Crossover Revelations

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

Enter the H Model… In early 2004 I acquired a pair of 604-8Hs, the last ALNICO magnet duplex model Altec produced before they switched to ferrite magnets. It was also the first Altec duplex model that combined the Tangerine phase plug with a … Continue reading →

Posted in GPA's Vintage Altec E-Zine, Jeff Markwart's Corner | Tagged 604-8H, Altec-Lansing, Great Plains Audio

Phase Shift Between Drivers

Great Plains Audio Posted on July 24, 2017 by Jeff MarkwartJuly 24, 2017
Altec-Lansing 604B

I acquired a pair of 604Bs in the early 1990s, and had them refurbished with new 604E low frequency (LF) cones and new 16 ohm high frequency (HF) diaphragms at the Altec factory in Oklahoma City, Oklahoma. I subsequently used … Continue reading →

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

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