ETS SM1-WLV Instructions

SM1-WLV Microphone Instructions
The SM1-WLV is a high quality, 12-24VDC powered, flush mount, omni-directional, pre-amplified, weather resistant
microphone for use with DRVs, IP cameras, etc. Note- the audio output of the SM1-WLV is "line level" (0db). Note- the
audio output of the SM1 is switch selectable "line level" (0db) or "microphone level" (-30db).

SM1-WLV Microphone Placement.

The SM1-WLV is designed for outdoor applications. It is important to locate it in an area that is not subject to driving rains
or excessive water flow because water will enter the space behind the sound chamber and damage the electronics. Do
not mount the microphone near air conditioning vents, light fixtures or electrical equipment. The SM1-WLV should be
placed as close as possible to the subject(s) to be monitored. The SM1-WLV 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.

Cable Run

Run a 22 gauge, stranded, two conductor shielded cable between the SM1-WLV 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-WLV is designed to be surface mounted on any flat surface or on an exterior single gang "bell" electrical box. Be
sure to use the supplied gasket to prevent water from entering the electronics.

Adjusting the SM1-WLV Gain

The SM1-WLV 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-WLV with IP cameras that utilize
"microphone inputs" also know as "Mic. Level" inputs. This sets the maximum gain of the SM1-WLV'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-WLV's pre-amp to x196.
The SM1-WLV 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-WLV Hi-Cut/Lo-Cut Switches

The normal frequency response of the SM1-WLV microphone is 500-16Khz. When both switched "in", The "HI Cut" and
"Lo Cut" filters set the SM1-WLV'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.