ETS SM1-P Instructions

SM1-P Microphone Instructions
The SM1-P is a high quality, Universally powered, flush mount, omni-directional, pre-amplified microphone with
enhanced features for use with DRVs, IP cameras, etc. Note- the audio output of the SM1-P is switch selectable
"line level" (0db) or "microphone level" (-30db).

SM1 Microphone Placement

Do not mount the microphone near air conditioning vents, light fixtures or electrical equipment. The SM1-P should
be placed as close as possible to the subject(s) to be monitored. The SM1-P is useable 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.

Cable Run

Run a 22 gauge, stranded, two conductor shielded cable between the SM1-P microphone and the monitoring
device. Keep the cable run distance under 1,000 feet and away from AC power sources, light fixtures and
electrical equipment. If you are connecting the SM1-P to an ETS product, connect power to right-most power
terminal of the SM1-P and ground to the ground terminal. The Ground of the power and audio signal must share
a common ground for proper operation. See Figure 1 for connection diagram.

External Power Source

The SM1-P can be independently powered from any voltage source in the ranges of: 9-42VAC and 12-60VDC.
For DC inputs, the SM1-P is not polarity sensitive. See Figure 2 for connection diagram.

Mounting

The SM1-P can be surface or flush mounted on ceilings or walls. For flush mounting, cut a 2 ¼" by 2 ¾ " hole in
the wall or ceiling tile to allow room for the circuit board and mount the SM1-P to the surface with screws. A single
gang electrical box can be used for surface mounting or consider using an SM1-PLE in place of the SM1-P.

Adjusting the Lo-Cut and Hi-cut filters

The SM1-PE's high and low frequency response can be trimmed to reduce background noise. If you are primarily
interested in capturing conversations and want to reduce air conditioning and other noises, rotate both controls
(hi-cut and lo-cut) to just short of full clockwise. Experimentation with the settings may be required to achieve the
best results for a given environment.

Adjusting the Automatic Gain Control

The SM1-P features automatic control of gain. This is useful for environments where it is anticipated that sound
levels will range from quiet to loud. The best way to set this control is to adjust it to a comfortable volume level (on
an ETS base station or PC monitor speakers) when the loudest sounds are present and constant. Turning the
control + CW will increase the amount of gain reduction during loud sound intervals. If the sound is reduced too
much during loud sounds, turn the control - CCW a small amount and continue experimenting until a comfortable
medium is found.

Adjusting the SM1-P Volume

The SM1-P output level is set by selecting the desired volume range and adjusting the gain control.
The "Volume Range" switch should be set to the "LO" position when using the SM1-P with IP cameras that utilize
"microphone inputs" also known as "Mic. Level" inputs. The switch should be placed in the "HI" position when
using IP cameras with "Line level" inputs of DVRs and IP cameras. The SM1-P is shipped with the Volume set at
midrange. If the sound at the "head end" is too loud and / or distorted, rotate the control - CCW. If the volume at
the "head end" is too low, rotate the control +CW.