Data Sheet

SM1-TR Omni-directional
Pre-amplified Microphone
Electronic Technical Services Inc.
211 Conchas SE
Albuquerque, NM 87123
PH 505-888-3923 FAX [phone]
Website: www.etsnm.com
Description
High performance, Omni-directional,
pre-amplified microphone for fixed
location security applications where
vandalism is of concern. Electret element
is mounted in a special housing which is
out of reach to objects inserted into the
sound holes. 25’ pickup pattern in all
directions. Built in limiter circuit
automatically lowers the output level
during loud sound intervals. Stainless
steel plate mounts flush or on a single
gang electrical box.
Connects directly to our switcher / mixer /
amplifiers or use one of our many
interface products to make fast and clean
connections to DVRs or remote
monitoring equipment.
Includes:
 SM1-TR flush mount microphone.
 Mounting screws.
 Warning label.
 Installation instructions.
Wiring requirements:
2 conductor shielded (with drain wire) 22
gauge stranded. Max cable length 1500’.
Caution
It is the responsibility of the installation
company and end user to install this audio
surveillance equipment in compliance with
state and federal privacy laws. If you are
unfamiliar with these laws, consult a qualified
attorney.
Warranty
1 year parts and labor.
SM1-TR Specifications
 Omni-directional 25’ pickup pattern.
 Tamper resistant electret element housing.
 Low noise MOSFET pre-amplifier.
 200Hz-16Khz Frequency response.
Significantly reduces background noise.
 Adjustable gain.
 Line level, unbalanced output.
 Limiter circuit selectable on/off.
 Treble boost selectable on/off.
 3 position Euro-style connector makes cable
termination fast and clean.
 Reverse polarity protected
 Power: 12VDC @ 10mA.
 On-board voltage regulator and RFI filtering.
 S/N ratio: more than 60DB
 Sensitivity –45DB
 Max cable length 1500’.
 Stainless steel plate mounts flush or on a
single gang electrical box.
 Dimensions: L 4.5” W 2.7” H 1.1”
Made in USA
Sound Surveillance
tm