STW1-SE Microphone Speaker Instructions
The STW1-SE is a two-way audio surveillance system (intercom accessory) designed to be used with DVRs, I/P cameras
etc. STW1-SEs are suitable for outdoor use but, exposure to driving rain should be avoided.
STW1-SE Microphone / Speaker Placement.
Locate the STW1-SE as close as possible to the area of interest in the space to be monitored. If a large area is to be
monitored, locate the STW1-SE in the middle of the space if possible. Do not mount the STW1-SE near air conditioning
vents, light fixtures or electrical equipment. The STW1-SE operates optimally at a distance of 3-5 feet from the subject(s)
to be monitored.The STW1-SE is still useable in the range of 15-25 feet but is dependent on the level of background noise
in the area. Experimentation in the environment will determine what distances work best.
Cable Runs
Run 2 each 22 gauge, stranded, two conductor shielded cable between each STW1-SE microphone / speaker and the
interface equipment. Keep both cable run distances under 250 feet and away from AC power sources, light fixtures and
electrical equipment.
See connection diagrams below.
Mounting
The STW1-SE is designed to surface mount on any flat hard surface. A 5 foot height is recommended. Cables can be
routed into the STW1-SE via the ½” “knock out” on the rear of the enclosure.
STW1-SE Optional Call Switch
Connect this switch to equipment that permits a “page” signal input. It is a N.O. (normally open) dry switch contact. Use a
22awg 2 conductor for this cable run.
Speaker Line / 70v switch
If you are using a “line level” (0db) audio signal input for the speaker, make connections as shown in the first drawing
below and place the input switch in the “line” position. If you are using a “70v” audio input for the speaker, make
connections as shown in second drawing below and place the input switch in the “70v” position.
Adjusting the STW1 Speaker Gain and Speaker Volume
Begin with a midrange setting of the gain control on the STW1. If it is determined that the speaker volume is too low when
the volume is set full clockwise, move the “volume range” jumper to the “HI” position. Then, re-adjust the “SPKR
VOLUME” c or – for maximum microphone clarity. If the sound at the DVR is distorted, rotate the control towards
the – mark (counter- clockwise). If the volume at the amplifier is too low, rotate the control towards the + mark (clockwise).
Adjust the “talk-back” speaker volume to the appropriate level.
Setting the STW1 Microphone Gain
The STW1 output level is set by selecting the desired volume range and adjusting the gain control.
The “Volume Range” jumper should be set to the “LO” position when using the STW1 with I/P cameras that utilize
“microphone inputs” also know as “Mic. Level” inputs. This sets the maximum gain of the STW1’s pre-amp to x14. The
jumper should be placed in the “HI” position when using I/P cameras with “Line level” inputs of DVRs and I/P cameras.
This sets the maximum gain of the STW1’s pre-amp to x196.
The STW1 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 STW1 Microphone Hi-Cut/Lo-Cut Jumpers
The normal frequency response of the STW1 microphone is 500-13Khz. When both jumpered “in”, The “HI Cut” and “Lo
Cut” filters set the STW1’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 jumper
settings to achieve the best acoustic result for your application
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