part# ED61T4SIFO Fourjay Quality —American Made Industrial/Institutional Surface Mount Speaker System for Voice Communications IS Series Form 372-02 model rated WT. IS445 45 ohms 16 45 ohms 5 IS4T16 25 V line 39,78,156,312 16,8,4,2 5.5 70 V line 312,625,1250,2500 INPUT TAPS Surface-mount speaker system built to survive harsh treatment of industrial/institutional use. Sturdy spin-formed steel housing is protected by a non-glare white baked powder coat finish. Rugged integral compression driver for noise penetration and speech intelligibility. 16 watts continuous duty, 500 Hz to 7000 Hz frequency range. 25/70 volt line has taps at 16, 8, 4 2 watts Power Handling: 16 watts continuous duty. Frequency Range: 700 -6500 Hz (3 dB) (On Axis) 500 -7000 Hz (6 dB) Sound Pressure: (1 octave at 2 kHz; at 1 M) 105 dB at 1 watt; 117 dB at 16 watts. Talk-Back Sensitivity: (Model IS445) Ref 94 dB (1.0 Pa) SPL 700 -2000 Hz; 28.6 1 mv or –17.4 dBm (0 dBm = 1 mw Materials: Enclosure and base; 18 gauge steel spin-formed to shape. Speaker; high impact ABS horn and high stability polycarbonate driver components. Finish: White textured urethane powder coat full coverage for maximum corrosion protection and long lasting appearance. Speaker: Enclosure unit has built in compres- sion driver type horn speaker. Replaceable phenolic diaphragm is driven by a rugged high power 1-1/2 voice coil. Magnet structure steel parts are plated per Mil. Spec. QQ-Z-325, type I, class 2, passes 96 hour salt spray test. Mounting Provisions: Base may be anchored directly to wall with screws as large as 1 /4, or to recessed standard 4 square or octagon electrical box. Wiring: Access through back for outlet box or hidden cable, or through side via one of four standard K.O.s for surface mounted conduit or cable. Turn enclosure on base to expose desired side K.O. entry. Wire directly to speaker or to transformer leads. Fasteners: Enclosure assembly secured to base with four #10 stainless steel hex button head machine screws. Use standard 1 /8 hex drive