Assessments - 3, GPA: 4.3
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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 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 spec i fications (KKK-A-1822C). The SD-370A is constructed using an ALNICO magnet. SPECIFICATIONS MODEL POWER RATING IMPEDANCE PLANE WAVE FREQ.RESPONSE LOW FREQ. LIMIT @ FULL POWER SOUND LEVEL*** DIMENSIONS WEIGHT SD-70 58 Watts* 11 Ohms (nominal) 0 o 2 o 8 o X N 200Hz 80-2,900Hz (±5dB) 115.8 (avg) (111 x 90mm) 438" Dia. x 3916" H 5 lbs. (2.3kg) SD-370A 100 Watts** 11 Ohms (nominal) 100 - 2,500Hz (±5dB) 200Hz 100-2,500Hz (±5dB) 117 (avg) (118 x 102mm) 458" Dia. x 3116" H 7.7 lbs. 3.5kg) * 25 V 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 (8 Atlas Sound © 2006 Atlas Sound LP 1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. TELEPHONE: (800) 876-3333 / FAX (800) 765-3435 Printed in U.S.A. AtlasSound.com ATS002453 RevA 8/06 SL7-1546 SEVEN ARCHITECT & ENGINEER SPECIFICATIONS Siren loudspeaker shall be Atlas Sound Model (SD-70, SD-370A) or approved equal. Assembly shall have a full-range power capacity of _Watts RMS. Rated frequency response range shall be_ _Hz ±5dB when measured on a plane wave tube at 1 mW. Unit shall have a sound pressure output of_dB at rated power when measured on a plane wave tube at 1 mW. Driver shall be capable of standard indoor/outdoor use and be fully-weather resistant. Units shall terminate in the industry standard 1JC - 18 thread pattern. Diaphragm material shall be high-temperature molded phenolic. SD-370A Impedance SD-370A Plane Wave Tube Response NOTE: Plane wave tube measurements provide resistive loads to test drivers. Actual frequency response of a driver / horn combination will vary depending on the horn used with the driver. Consult individual horn specification sheet for typical horn frequency response. Specifications subject to change without notice Atlas Sound 1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. TELEPHONE: (800) 876-3333 / FAX (800) 765-3435 Atlas5ound.com © 2006 Atlas Sound LP Printed in U.S.A. ATS002453 RevA 8/06 SL7-1546...