ETS CSM8-S Instructions

CSM8 Speaker / Microphone Instructions
The CSM8 is a combination 70V speaker and pre-amplified microphone designed to flush mount in an acoustic ceiling
tile, drywall, etc. The CSM8 is designed to directly interface with the ETS SMA1 for connection to DVRs, IP cameras, etc.
but, can be used with other comparable equipment. Note- to prevent unwanted feedback, use this product with systems
supporting PTT (push to talk) half duplex audio or full duplex audio systems using acoustic echo cancelling technology
CSM8 Microphone / Speaker Placement.
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Locate the CSM8 speaker microphone near the area of interest in the space to be monitored. If a large area is to be
monitored, locate the CSM8 in the middle of the space if possible. Avoid mounting the speaker / microphone near air
conditioning vents, light fixtures or electrical equipment. The CSM8 should be placed as close to the subject(s) as
possible. The CSM8 is still 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.
Audio Signal Cable Runs
Recommended cable is: 2 each 22 gauge, stranded, two conductor shielded cables (one for the microphone and the
other for the speaker) between the CSM8 microphone / speaker and the SMA1-xx or other equipment. Keep the cable run
distances under 250 feet (line level input) or 500' (70v speaker input) and away from AC power sources, light fixtures and
electrical equipment. Make connections as shown in Figure 1.
CSM8 Mounting
The CSM8 can be surface or flush mounted on ceilings or walls. For flush mounting, cut a 9 " diameter hole in the wall or
ceiling tile to allow room for the speaker / microphone assembly and mount the CSM8 to the surface with screws after
making connections. For surface mounting, purchase a CSM8-S surface mount adaptor kit.
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" control + 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 IP 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 IP cameras with "Line level" inputs of DVRs and IP 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