General Information

Serial #

71-2264

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

STEEL HEADBAND; FOAM RUBBER HEADBAND CUSHION; VINYL COVERED EARPHONE CUSHIONS; SYNTHETIC EARPHONE CASINGS, HEADBAND COVER, CORD COVERING, PLUG CASINGS, PARTS; METAL PLUG & PARTS/ CW 2 SYNTHETIC BUTTONS

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

23.0 cm

Width

18.0 cm

Height

N/A

Thickness

10.0 cm

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Radio

Sub-Category

N/A

Manufacturer

AKA

KOSS

Country

United States of America

State/Province

Wisconsin

City

Milwaukee

Context

Country

Canada

State/Province

Ontario

Period

GENERAL: 1970'S

Canada

PART OF COLLECTION (1972.0318; 1972.1332-1346) OF "STEREOPHONES" DONATED (WITH TRADELITERATURE) TO NMST IN 1972 BY KOSS. CORP. OF MILWAUKEE, WIS., ALL EXAMPLES OF KOSS "PRODUCT LINE" OF THAT PERIOD. KOSS HAD MADE SIMILAR DONATION TO SMITHSONIAN (SEE PHOTOS, PRESS RELEASES & CORRESPONDENCE IN SUPP. INFO. 1972.0318).

Function

ELECTROACOUSTIC DEVICE WHICH TRANSFORMS ELECTRICAL WAVES INTO AUDIO SIGNALS, WORN OVER EARS BY LISTENER.

Technical

IN 1971 KOSS DEVELOPED INDUSTRY'S FIRST 4-CHANNEL HEADPHONE K2+2, WITH FOUR SEPARATE DYNAMIC DRIVER ELEMENTS TO REPRODUCE SOUND FROM 4-CHANNEL AMPLIFIERS, & 4-CHANNEL/2-CHANNEL SWITCH. K2+2 WAS MFD. FROM 1971-1977. IN 1972 LINE WAS EXPANDED TO INCLUDE THREE ADDITIONAL QUADRAFONES. SOLD FOR $85.00 IN 1971 (REFS. 1-5).

Area Notes

Unknown

Details

Markings

PLATE ON EACH EARPHONE READING "[LOGO] KOSS K/2+2 [LOGO]/ QUADRAFONE" & "LEFT 1-2" OR"RIGHT 3-4".

Missing

N/A

Finish

TEXTURED BLACK EARPHONE CASINGS & HEADBAND COVER; BLACK EARPHONE CUSHIONS, CORD COVERING, HEADBAND CUSHION; GREY & BLACK PLUG CASINGS, SWITCHES; PLATED HEADBAND; BRUSHED METAL TRIM ON EARPHONES.

Decoration

N/A