SM8 Switcher / Mixer Instructions - Surveillance

SM8 Switcher / Mixer Instructions - Surveillance
SM8 Switcher / Mixer Instructions
The SM8 is a 8 single channel, one way “listen only” switcher / mixer base station for use with all ETS
SM1 series microphones. The SM8 can be used independently or with a CCTV system. The SM8 also
easily connects to recording equipment such as DVRs, linear time-lapse VCRs and audio tape recorders.
Note the audio input / output signals of the SM8 are “line level” (0dbm).
Microphone Placement.
Place the SM1 microphones in the areas of interest in a room or multiple rooms to be monitored. If an
entire room is to be monitored, locate the SM1 in the middle of the room. Do not mount the microphone
near air conditioning vents, light fixtures or electrical equipment. Point the SM1 in the direction of the area
to be monitored. The SM1 should be placed at least 4 feet away from the subject(s) to be monitored.
Place the SM8 switcher/mixer in the room from which you will be monitoring. The SM1 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 Run
Run a 22 gauge, stranded, two conductor shielded cable between the SM8 amplifier and the SM1
microphone. Keep the cable run distance under 1,000 feet and away from AC power sources, light
fixtures and electrical equipment. See Figure 1 for connection diagram.
Microphone Mounting
The SM1 can be surface or flush mounted on ceilings or walls. For flush mounting, cut a 2 ¼” by 2 ¾ “
hole in the wall or ceiling tile to allow room for the circuit board, connect the cable and mount the SM1 to
the surface with screws. For surface mounting, purchase a low profile Wire Mold single gang box and
mount it to the wall or ceiling with screws, connect the cable and attach the SM1 to the box.
Adjusting the SM1 Gain
Start with a midrange setting of the gain control on the SM1. Adjust the control + 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.
Note: Do not use the SM1’s limiter circuit if you are using a tape recorder or other device that uses
an AGC or limiter circuit. Most tape recorders have limiter circuits.
The recommended jumper settings are as follows:
Limiter
Treble Boost
Stand-alone Application
“IN”
“OUT”
Tape Recorder Application
“OUT”
“IN”
Using the SM8 with an audio recorder or VCR
If you are using an audio recorder, press and hold down Button Number 2 (approximately 4 seconds) until
the Recorder light comes on; then connect the VCR as shown in the drawing below.
If the SM8 is not going to be used with an audio recorder, press and hold down Button Number 2
until the Recorder light goes off.
Changing SM8 Modes: Switcher Mode or Mixer Mode
The SM8 can be set to operate as a 1-of-8 channel switcher or as an 8 channel mixer. In the 1-of-8
mode, only one of the eight microphones can be monitored at a time. In the mixer mode, any combination
of microphones can be mixed together.
To switch between the two modes, press and hold down Button Number 1 (approximately 5 seconds). All
8 of the channel lamps will light if the mixer mode has been selected. If the switcher mode is selected, all
the lamps will go out. The SM8 will remember your last setting and on power up, the SM8 will load the last
setting.
Figure 1.
Caution
It may be against the law to install this microphone kit in certain environments. It may also be against the law to
record conversations of the person(s) being monitored without their knowledge. It is the responsibility of the
installation company and end-user to determine if the application of this product is legal. These laws vary from state
to state. If you are not informed on these matters, consult a qualified attorney or contact the appropriate state agency.
A sticker is provided with this kit for the applications where notification must be posted.
Warranty
All ETS products carry a one year parts and labor warranty. This warranty does not cover damages as a result of
misuse, improper handling of the unit or exposure to extreme temperatures or moisture. At its discretion, ETS
reserves the right to repair or replace this unit under the conditions of the warranty. If you experience problems with
your equipment call ETS at: 505-888-3923 to obtain a return authorization number. Equipment requiring repair
beyond the warranty period or units that have been damaged or are not covered under the warranty can be repaired
by ETS for a minimal cost under most conditions.
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