ETS SMM-2 User manual

SMM-2 Microphone Mixer Instructions
The SMM-2 is a 2 channel microphone mixer designed to expand the area of coverage of a large area to
be monitored. It can be used directly with DVRs, IP cameras or can be connected directly to ETS base
stations. Note- the audio output of the SMM-2 is “line level” (0db).
SM1 Microphone Placement
Locate the SM1s microphones as close as possible to the areas of interest in the space to be monitored.
Do not mount the microphones near air conditioning vents, light fixtures or electrical equipment. The
SM1s should be placed as close as possible to the subject(s) to be monitored. An SM1 is usable at
distances of up to 25 feet but is dependent on the level of background noise in the area. Experimentation
in the environment will determine what distances work best.
SMM-2 location and power
The SMM-2 interface box is designed to be located next to a DVR or IP camera. The SMM-2 requires a
120VAC power source within 3 feet of its location. If this is not possible in your application, you can splice
in up to 100 feet of 18 awg, 2 conductor cable to extend the distance between the AC power source and
the SMM-2.
Cable Run
Run 2 each 22 gauge, stranded, two conductor shielded cable between the SMM-2 mixer and the SM1
microphones. Keep the cable run distances under 1,000 feet and away from AC power sources, light
fixtures and electrical equipment. See Figure 1 for connection diagram.
Microphone level controls
Each microphone level can be adjusted to a higher or lower volume so that all microphones can be
balanced out for similar sound levels (one microphone dominates the overall sound, for example).
Experiment by adjusting each level control to achieve the desired overall volume.
Master Volume
This adjustment controls the output level of the microphone mix.
Audio output
This output is typically connected to the audio input of the DVR, IP camera, etc. You can extend this
output up to 1000 feet using audio coaxial cable and 2 field installable RCA (or 3.5mm) connectors.
Base station Connection
This output can be connected to any ETS base station or interface microphone input. The AC adaptor
that comes with the SMM-2 is not required because it is powered up by the ETS base station or interface.
All three connections, +, -, and audio are required along with the cable requirements of 2 conductor
shielded. See connection diagram.

Figure 1
Caution
It may be against the law to install this microphone kit in certain environments. It may also be against the law to
record conversations of the person(s) being monitored without their knowledge. It is the responsibility of the
installation company and end-user to determine if the application of this product is legal. These laws vary from state
to state. If you are not informed on these matters, consult a qualified attorney or contact the appropriate state agency.
A sticker is provided with this kit for the applications where notification must be posted.
Warranty
All ETS products carry a one year parts and labor warranty. This warranty does not cover damages as a result of
misuse, improper handling of the unit or exposure to extreme temperatures or moisture. At its discretion, ETS
reserves the right to repair or replace this unit under the conditions of the warranty. If you experience problems with
your equipment call ETS at: 505-888-3923 to obtain a return authorization number. Equipment requiring repair
beyond the warranty period or units that have been damaged or are not covered under the warranty can be repaired
by ETS for a minimal cost under most conditions.
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