Alpha IS4T16, IS445 Specsheet

Industrial/Institutional Surface

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Surface- mount speaker system built to sur vive
harsh treatment of industrial/institutional use.

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Sturdy spin-formed steel housing is protected
by a non- glare white baked powder coat finish.

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Rugged integral compression driver for noise
penetration and speech intelligibility.

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16 watts continuous duty, 500 Hz to 7000 Hz
frequency range.

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25/70 volt line Model IS4T16 has taps at
16, 8, 4 & 2 watts.

Mount Speaker System

for Voice Communications

IS4 Series

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45 ohm Model IS445 has excellent sensitivity
as a microphone in talk-back systems.

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Versatile mounting allows surface conduit or
in-wall electrical box wiring.

MODEL RATED WT.

NO. INPUT WATTS IMPEDANCE (lbs.)

IS445 45 ohms 16 45 ohms

IS4T16 25 V line 39,78,156,312

16,8,4,2 5.5

70 V line 312,625,1250,2500

POLAR PLOT

INPUT TAPS

5

RESPONSE CURVE

- -

Industrial/Institutional Surface Mount Speaker System IS4 Series

TECHNICAL SPECIFICATIONS

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).

PHYSICAL SPECIFICATIONS

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 compres­sion 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 driver.

ARCHITECT’S & ENGINEER’S SPECIFICATIONS

The Industrial/Institutional surface mount speaker
system shall consist of a round enclosure and base
unit with integral compression driver horn speaker for
voice communications. Enclosure and base shall be
18 gauge steel spin-formed and protected overall by
a baked on powder coat urethane finish. The base
shall have provisions for attachment to a common 4⬙
recessed outlet box or to be fastened directly to a
wall by screws as large as 1Ⲑ4⬙. Wiring shall enter
through back for hidden cable or via one of four side
entry K.O.s for surface cable or 1Ⲑ2⬙ conduit. The
enclosure shall attach to the base with (4) #10 stain­less steel hex drive screws. Color shall be UV stable
White with a textured finish.

Frequency response shall be 500 to 7000 Hz, on
axis. SPL at 16 watt input at 1 meter shall be 117
dB. Power handling capability shall be 16 watts
continuous duty.

The speaker system in compliance with this specifica­tion is Model IS445 (45 ohm impedance) or
Model IS4T16 (25 or 70 volt audio line).