ETS SM6-M2, Instructions

Page: 1 / 3

SM6-M2 Microphone Kit Instructions
The SM6-M2 is a 2 microphone expanded coverage (50 feet) complete stand-alone audio monitoring system. The
SM6-M2 can be used independently or with a CCTV system. The SM6-M2 also easily connects to recording equipment
such as DVRs, linear time-lapse VCRs and audio tape recorders.
SM1 Microphone Placements.
Locate the SM1 microphones near the areas of interest in the rooms to be monitored. If the entire room is to be
monitored, locate the SM1s in the middle of the room spread equally apart. Do not mount the microphones near air
conditioning vents, light fixtures or electrical equipment. The SM1s should be placed at least 5 feet away from the
subject(s) to be monitored. The SM1s
are
still useable in the range of 15-25 feet but is dependent on the level of
background noise in the area
s
. Experimentation in the environment will determine what distances work best.
SM1 Mounting
To flush mount the SM1s on ceilings or walls, cut a 2¼” by 2
¾
“ hole in the wall or ceiling tile to allow room for the circuit
board and mount the SM1s to the surface with screws. For surface mounting, purchase the ETS SM1-LE omni-directional
microphones or use single gang electrical boxes.
Cable Runs
Run 3 22 gauge, stranded, two conductor shielded cable between the SM3 amplifier, SMM2 mixer and the SM1
microphones. Keep the cable run distances under 1,000 feet and away from AC power sources, light fixtures and
electrical equipment.
See Figure 1 for connection diagram.
SMM2 Mixer location
The SMM2 can be located any place in the system, whether it be close to the microphones or near the SM3 base station.
The SMM2 used in this application, does not require an AC adaptor connected to the 12Vdc input jack because it is
supplied power from the SM3 base station’s microphone input.
SM3 Recorder switch
If the SM6 kit will be used with a recorder of some type, place the recorder switch in the “IN” position. In this position, both
live audio and playback audio can be heard through the SM3s internal speaker. In stand alone applications where there is
no recorder or no need to playback recordings, place the recorder switch in the “OUT” position.
SM3 Headphone jack
Plug in a set of 3.5mm stereo headphones for private listening. The internal speaker of the SM3 will be automatically
disabled until the headphones are unplugged.
Adjusting the SM1 Gain
Start with a midrange setting of the gain control on the SM1. Adjust the c or – for maximum clarity. If the sound at
the amplifier 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).
Setting the SM1 Jumpers
The SM1 microphone has jumper selectable treble boost and limiter circuits. The treble boost circuit when jumpered in,
emphasizes the high frequency sounds that the microphone picks up. This is useful for improving the sound quality on
slow speed tape recordings (VCR time-lapse recordings). The limiter circuit, when jumpered in, automatically keeps the
SM1’s output at a relatively constant level. This eliminates the need for the listener to reduce the volume control on the
amplifier when sounds get louder.