ETS SM1-APE Instructions

SM1-APE Microphone Instructions
The SM1-APE is a stainless steel, high quality, 12-24VDC powered, flush mount, Boundary
pattern, pre-amplified microphone with a for use with DRVs, IP cameras, etc. Note- the audio
output of the SM1 is jumper selectable "line level" (0db) or "microphone level" (-30db).
SM1-APE Microphone Placement.
Locate the SM1-APE Microphone near the area of interest in the room to be monitored. If the
entire room is to be monitored, locate the SM1-APE in the middle of the room. Do not mount the
microphone near air conditioning vents, light fixtures or electrical equipment. The SM1-APE
should be placed as close as possible to the subject(s) to be monitored. The SM1-APE is still
useable in the range of 3-25 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-APE 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. Connect power to the + terminal, the audio signal
to the "audio" terminal and ground to the – terminal. The Ground of the power and audio signal
must share a common ground for proper operation. See Figure 1 for connection diagram.
Mounting
The SM1-APE 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-
APE to the surface with screws. A single gang electrical box can be used for surface mounting or
consider using an SM1-APE-LE in place of the SM1-APE.
Adjusting the SM1-APE Gain
The SM1-APE 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-APE with IP
cameras that utilize "microphone inputs" also know as "Mic. Level" inputs. This sets the
maximum gain of the SM1-APE's pre-amp to x14. The switch should be placed in the "HI"
position when using IP cameras with "Line level" inputs of DVRs and IP cameras. This sets the
maximum gain of the SM1-APE's pre-amp to x196.
The SM1-APE is shipped with the gain set at midrange. If the sound at the "head end" is
distorted, rotate the control towards the – mark (counter-clockwise). If the volume at the "head
end" is too low, rotate the control towards the + mark (clockwise).
Setting the SM1-APE Hi-Cut/Lo-Cut switches
The normal frequency response of the SM1-APE microphone is 500-13Khz. When both switched
"in", The "HI Cut" and "Lo Cut" filters set the SM1-APE's frequency response to 900-6Khz .
Enabling one or both of the filters is useful when background noise needs to be further reduced
and intelligibility of speech emphasized. We recommend experimenting with the switch settings to
achieve the best acoustic result for your application.