INTERIOR VIEW OF ELECTRO-VOICE MODEL 668 BOOM MICROPHONE

E&MP 90.003

Noise Control

ca. 1964

Interior view of Electro-Voice Model 668 boom microphone shows two layers of Acoustifoam^TM windscreen which reduces wind blast up to 80 per cent.

Acoustifoam is an "open-pore" polyurethane foam developed by the Foam Division, Scott Paper Company.

Smooth-textured outer layer has 60 pores per lineal inch; coarser inner layer has 20 pores per lineal inch. Windscreen does not affect frequency response of polar pattern.

For: Foam Division Scott Paper Company From: Ketchum, MacLeod & Grove, Inc. Four Gateway Center - Pittsburgh, Pa. 15222 A. C. Croft - Phone: 261-5100

Original Caption by Science Service