Model 27

The David Clark Company Model 27 Combines Comfort Durability and Quality construction with Superior Low frequency noise attenuation.

Assembled by means of bolts and self-locking cadmium plated nuts.
Premium Quality chrome plated steel headband, in accordance with demanding Government specifications.
Closed cell, nonabsorbent bump cushion with protective outer support
Foam-filled ear seals for perfect fit, best noise attenuation, and unequaled comfort.
Ear cups of top quality, high impact ABS, made extra rigid by patented ribbed construction.

NRR 22 dB	NOISE ATTENUATION DATA - MODEL 27
	Frequency (Hz)	125	250	500	1000	2000	3150	4000	6300	8000
	Attenuation (dB)	22.9	26.4	26.1	31.0	31.5	33.6	35.5	35.8	35.8
	Standard Deviation	3.8	3.5	3.7	3.7	3.3	4.2	4.7	4.9	4.3