Atlas Sound SD-370A specifications SD-70, Features, Applications, General Description, Seven

	COMPRESSION DRIVERS		SD-70
FOR ELECTRONIC SIREN LOUDSPEAKERS			SD-370A
		FEATURES
		• Choice of 58 or 100 Watt Power Handling for High Intelligibility and
		Sound Penetration
		• Heavy-Duty Weatherproof Construction
		• Specifically-Designed for Electronic Siren and Signaling applications
		• Accommodates Most Horns and Reflex Horns with Standard
		13⁄8" – 18 Thread Pattern
		APPLICATIONS
		Depend on SD Series compression drivers for electronic siren and
		signaling needs on emergency and law enforcement vehicles, as well
		as for use in stationary and mobile public address systems. Models
		SD-70 and the patented SD-370A (U.S. Patent #7,760,501) provide
		maximum power conversion with low-amplifier output to fulfill high-
		intelligibility and sound-penetration requirements. Model SD-70, rated
		at 58 Watts RMS, is recommended for medium-power systems such
		as commercial and industrial warning systems. Model SD-370A, rated
SD-70
		at 100 Watts RMS, is recommended for high-power systems in public
		safety, civil authority, military, or emergency medical applications.
		Either unit can be used with most horns or reflex horns equipped with
		the industry standard 13⁄8" – 18 thread pattern.
		GENERAL DESCRIPTION
		SD Series 58 and 100 Watt compression drivers are standard
		components of the Atlas Sound electronic siren loudspeaker
		assemblies. Weatherproof units are ideal for use in police, fire,
		ambulance, and utility vehicles. Model SD-70 is recommended for
		medium-powered systems; SD-370A for high-powered systems.
		Drivers are equipped with a non-fatiguing, self-aligning sound chamber
		assembly containing a 23⁄4" phenolic diaphragm with a nominal
		impedance of 11 Ohms. Replacement head assembly, Model K-70GB
		is available for field replacement of Model SD-70; Model K-370A for
		SD-370A. Product series is suitable for use with matched amplifier
		and control equipment in systems requiring AMECA (Automotive
		Manufacturer Equipment Compliance Agency, Inc.) certification to
		General Services Administration specifications (KKK-A-1822C). The
SD-370A		SD-370A is constructed using an ALNICO magnet.

SEVEN

					SPECIFICATIONS
	POWER	IMPEDANCE	PLANE WAVE			LOW FREQ. LIMIT	SOUND
MODEL	RATING		FREQ. RESPONSE			@ FULL POWER	LEVEL***	DIMENSIONS	WEIGHT
SD-70	58 Watts*	11 Ohms	100 - 2,900Hz			200Hz	115.8 (avg)	43⁄8" Dia. x 39⁄16" H	5 lbs.
		(nominal)	(±5dB)			80-2,900Hz (±5dB)	(111 x 90mm)		(2.3kg)
SD-370A	100 Watts**	11 Ohms	100 - 2,500Hz			200Hz	117 (avg)	45⁄8" Dia. x 31⁄16" H	7.7 lbs.
		(nominal)	(±5dB)			100-2,500Hz (±5dB)	(118 x 102mm)		3.5kg)
* 25V into 11 Ohms = 58 Watts		** 33V into 11 Ohms = 100 Watts		*** Measured on a plane wave tube at 1mW
			Specifications subject to change without notice
		1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A.					AtlasSound.com
		TELEPHONE: (800) 876-3333		/	FAX (800) 765-3435

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© 2006 Atlas Sound LP Printed in U.S.A. ATS002453 RevA 8/06 SL7-1546