SA1-MP Speaker Driver Instructions
The SA1-MP is a single / multi -speaker driver designed to connect to the audio output of DVRs, I/P cameras etc, for two
way audio applications. The SA1-MP can also be connected to STWX base stations for increased speaker power or
existing PA systems using 70v speaker lines. Note- the audio “line” input of the SA1-MP is “line level” (0db).
Speaker Placement
Locate the speaker(s) as close as possible to the area of interest in the space to be monitored. Do not mount the
speaker(s) near air conditioning vents, light fixtures or electrical equipment. The speaker(s) should be placed at least 5
feet away from the subject(s) to be addressed. A speaker 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.
SA1-MP location and power
The SA1-MP interface box is designed to be located next to a DVR or I/P camera. The SA1-MP requires a 120VAC power
source within 3 feet of its location. The power cord may be extended up to 100’ with #18, 2 conductor if an 120AC source
isn’t readily nearby.
Speaker Cable Run
Run a 22 gauge, stranded, two conductor shielded cable between the SA1-MP amplifier and the speaker. Keep the cable
run distance at or under 1,000 feet (70v mode only) and away from AC power sources, light fixtures and electrical
equipment. In 8 Ohm mode, keep the cable run at or under 250 feet.
See Figure 1 for connection diagram.
Multiple speakers (public address system)
Note-70v speaker systems allow long cable runs with multiple speakers and minimal power losses across the speaker
wires. Use 70V speakers only in multi-speaker applications. Select wattage taps on speakers for desired volumes and
total wattage not to exceed 10 watts. Connect all speakers with parallel wiring. You can use one 70V speaker and select
the maximum power level tap.
70V / 8 Ohm speaker output switch
If you want to use an 8 Ohm speaker, place this switch in t he 8 Ohm position and limit your speaker cable run to 250 feet.
If your are using a single 70V speaker, place the switch in the 70v position and pick the wattage tap closest to 30 Watts.
70V / line audio input switch
If you are using the SA1-MP to boost the power level of an ETS base station speaker output OR tying into an existing 70V
public address system, place this switch in the “70V” position. If you are connecting the SA1-MP to a DVR, I/P “line level”
audio output, place this switch in the “line” position.
SA1-MP level control
The speaker level can be adjusted to a higher or lower volume. Experiment with the level control to achieve the desired
volume.
SA1-MP audio line input.
This input is line level (0db). Connect this to the audio output of your DVR, I/P camera, etc. If the audio output are screw
terminals, cut one end off the supplied patch cable and strip back the wires. Connect the center conductor to “+” terminal
and the shield to the “-“ terminal.
Connecting STW base stations
Run a #22 shielded cable from an ETS base station speaker output to the SA1-MP 70V input and select 70V input mode.
C to +, - to – and shield to shield.
Available from A1 Security Cameras
www.a1securitycameras.com email: [email protected]
