STW1-W4 Speaker/Microphone Instructions
The STW1-W4 is a two-way audio surveillance system (intercom accessory) designed to be used with DVRs, I/P cameras
etc. Note- STW1-W4s are not recommended for outdoor use where they may be exposed to water.
STW1-W4 Microphone / Speaker Placement.
Locate the STW1-W4 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 STW-W4 in the middle of the space if possible. Do not mount the STW1-W4 near air conditioning
vents, light fixtures or electrical equipment. The STW1-W4 should be placed at least 5 feet away from the subject(s) to be
monitored. The STW-W4 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 the STW1-W4 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
Mount the STW1-W4 on walls or ceilings using the provided hardware. Note where the microphone is and orient it in the
general direction of the area of interest.
STW1-W4 Optional Call Switch
Connect this switch (STW1 terminals cs1 and cs2) 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-W4 Speaker Gain and Speaker Volume
Begin with a midrange setting of the gain control on the STW1-W4. 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-W4 Microphone Gain
The STW1-W4 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-W4 with I/P cameras that utilize
“microphone inputs” also know as “Mic. Level” inputs. This sets the maximum gain of the STW1-W4’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-W4’s pre-amp to x196.
The STW1-W4 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-W4 Microphone Hi-Cut/Lo-Cut Jumpers
The normal frequency response of the STW1-W4 microphone is 500-13Khz. When both jumpered “in”, The “HI Cut” and
“Lo Cut” filters set the STW1-W4’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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