General Information

Serial #

70-1615

Part Number

1

Total Parts

2

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, PARTS; METAL PLUG & PARTS

Dimensions

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

Length

22.5 cm

Width

18.0 cm

Height

N/A

Thickness

9.8 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

EARLY 1970'S

Canada

PART OF COLLECTION (1972.0318; 1972.1332-1346) OF "STEREOPHONES" DONATED (WITH TRADE LITERATURE) 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 1970 KOSS DEVELOPED FIRST DRIVER ELEMENT SPECIALLY DESIGNED FOR DYNAMIC HEADSETS & INTRODUCED PRO-4AA, WHICH FEATURED RANGE TWO OCTAVES BEYOND THAT OF ORDINARY DYNAMIC HEADSETS IT SUCCEEDED PRO-4A (MARKETED 1962-1971) WHICH WAS LARGEST SELLING HEADSET IN COUNTRY. PRO-4AA WAS SOLD FOR $60.00 IN 1971 (REFS. 1-4).

Area Notes

Unknown

Details

Markings

PLATE ON EACH EARPHONE READING "PRO/4AA/ KOSS" & "LEFT" OR "RIGHT"

Missing

APPEARS COMPLETE

Finish

TEXTURED BEIGE EARPHONE CASINGS & HEADBAND COVER; BLACK EARPHONE CUSHIONS, HEADBAND CUSHION, CORD COVERING, PLUG CASING;; PLATED HEADBAND, EARPHONE CONTROL, PLUG

Decoration

N/A