Fostex Orthodynamic Line Overview

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Fostex 1978 brochure cover
Fostex 1978 brochure cover


Image:FostexLogo.jpgBrief History and General Information

Company History

Fostex 1980 brochure cover
Fostex 1980 brochure cover

The Fostex Company was founded in July 1973 by Foster Electric Co., Ltd. (founded 1949). Fostex was established to brand high quality speaker components from Foster and sell them direct to consumers and dealers in the Japanese marketplace. As to be expected of a division of Foster Electric Co., Ltd., Fostex also produces a range of microphones, headphones, studio monitors and portable PA speakers.

Orthodynamic Headphone Line History

Fostex started making orthodynamic headphones in the mid 70's and continues to manufacture them to this date under the RP (Regular Phase, or as Fostex now calls it, Regulated Phase) moniker. Fostex describes the technology this way:

Key to the transparent sound reproduction is Fostex's RP Technology, a proprietary transducer and diaphragm design that has earned Fostex more than twenty international patents and has been successfully applied to microphones, headphones and loudspeakers used and relied upon in professional and commercial sound installations worldwide.

There have now been three generations of RP headphones. With each, the sound signature has moved farther away from audiophile to one tailored to the specific needs of studio professionals. Which is not to say that the sound of the latest generation can't be wrestled back into the audiophile realm-- it will simply take a lot of work and expense.

Fostex Orthodynamic Line Models of Interest

1970's 1980's 1990's 2000's

Fostex T10

Fostex T20

Fostex T30

Fostex T50

Fostex T50 v2 & OEM headphones

Fostex T20RP v2

Fostex T40RP

Fostex T20RPmkII

Fostex T40RPmkII

Fostex T50RP

Fostex TH500RP

As you might have noticed the names of the models were reused over the years and sometimes the same name was used for two completely different headphones. Wualta created a simple guide in the orthodynamic thread, here is the link to the wiki article with this Fostex orthodynamic headphone identification guide.

In addition to the models listed above there were several probable Fostex OEM headphones:

Pacific Stereo Concept CE-H

Grundig GDHS 223

Denon SH-90

Maior RPT-50


Lafayette RP-50

Sansui SS-100

Aiwa HP-500

Kenwood KH-85B

Kenwood KH-83

Brochures and Various Pictures

Current Fostex RP lineup

New Fostex RP lineup cover
New Fostex RP lineup cover

Fostex 1986 RP lineup

Fostex 1980 RP lineup

Fostex 1978 RP lineup

Sansui SS-100 (Fostex OEM) Brochure

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