General Description:
The University Sound MIS8C is a conservatively rated 10-
watt reflex paging projector designed for flush-mounting.
The driver uses a rugged phenolic diaphragm, a 0.75-
inch voice coil and component parts proven reliable under
stressful conditions. A dispersion angle of 100° +/-25° is
maintained over the frequency range of 1,200 Hz to 3,000
Hz. Excellent loading is maintained to a low-frequency
cutoff of 600 Hz. The MIS8C is molded from rugged
polycarbonate and the inner reflector from ABS. With it’s
weatherproof construction the MIS8C may be used both
indoors and outdoors. Designed for low-impedance
systems, this compact horn has outstanding speech
intelligibility and high efficiency. The directional
characteristics of the MIS8C were measured by running a
set of polar responses in University’s large anechoic
chamber. The test signal was one-third-octave-band-
limited pseudo-random pink noise centered at the ISO
standard frequencies indicated in Figure 1. Additional
typical data is provided in Figure 2 which indicates 6-dB-
down beamwidth versus frequency for an MIS8C. Figure 3
shows the axial frequency response of the MIS8C horn. It
was measured at a distance of 1 meter, using a swept
sine wave. Six holes around a 4.87 in (12.4cm) diameter
circle provide a means for fluch mounting the speaker.
When frequencies below the low-frequency cutoff for the
horn assembly are fed to the driver, excessive current may
be drawn by the driver. For protection of the driver and
amplifier, capacitor in series with driver is recommended.
For drivers without transformers:
8-ohm driver, 25V - 100 mf
4-ohm driver, 25V - 200 mf
150V dc or 150V non-polarized electrolytic, or two 150V
electrolytics of two times required value in series, back to
back, for 70V lines.
Technical Specifications:
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MIS8C
Paging and Public
Address
Loudspeaker
Architectural & Engineering Specs:
The loudspeaker shall be an integral driver and
loudspeaker utilizing a rugged phenolic diaphragm and
high-temperature rated 0.75-inch voice coil. The axial
frequency response will extend from 900 - 6,300 Hz. Sound
pressure level will be 101 dB (1W/1M) with a 500 - 5,000 Hz
pink noise signal applied, and the horn will produce a
dispersion angle of 100° at 2.0 kHz. The loudspeaker shall
be capable of handling a 10 watt, 500 - 5,000 Hz pink noise
signal for a period of eight hours. The horn shall be molded
Polycarbonate, with ABS reflector material and capable of
satisfactory mechanical performance under extreme
conditions. Mounting is of the flush-type with six mounting
holes being provided on a 4.87-inch (12.4cm) diameter
circle around the horn. The loudspeaker shall be 5.5-inch
(14.0cm) in diameter and 4.2-inch (10.6cm) deep. The
loudspeaker shall be the University Sound MIS8C with a
nominal impedance of eight ohms, and shall weigh no more
than 1.3 lbs (0.6 kg).
