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12
SM-III Plus Installation and Operation Manual
SPECIFICATIONS
SPECIFICATIONS
IInput level:
–20 to +27 dbu, balanced bridging (22 K ø),
Program switcher:
(2 x DPDT Relays)
Any input level and impedance can be used. Inputs may be
balanced or unbalanced. Output levels, impedance, distortion,
noise and balancing will match that of the selected input.
Sensitivity:
Dipswitch selectable: –23, –25, –35 or –45 db for each channel.
Operation Control:
Front Panel - Momentary switches.
Remote inputs - Closure to ground or 5 Volt TTL/CMOS Logic
levels.
Relays - All but one SPDT sealed relays utilizing bifurcated-
crossbar silver alloy with gold overlay contacts, 1 amp @ 30
vdc, (2 x DPDT for program switcher).
NOTE: For safety, do NOT connect 120 Vac circuits to these
Relays!
Open collectors - 15 vdc @ 100ma each.
Silence delay:
2 seconds to 85 minutes, in 2 or 20 second increments, via an
8-position dipswitch and Jp-1.
Restore delay:
Off to 42 minutes in 2 or 20 second increments, via an 8-posi-
tion dipswitch and Jp-1. This feature may be defeated.
Logic:
Microprocessor with nonvolatile memory.
Interfacing:
Audio& Remote Control - Plug-in euroblock screw terminals,
dual-row 18 position. Mate Supplied.
Power - 2.1 mm barrel.
Power Requirements:
16 VAC ONLY, 600 ma. 120 Vac 50-60 hz transformer.
Supplied.(optional CE 240 Vac 50-60 Hz)
Physical Dimensions:
5.65” x 6.50” x 1.55” (WDH)
Weight:
2 pounds.
Options:
RA-1 rack shelf, holds three units (1-RU), filler panels supplied
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