Instruction Manual

SMA2-LPC5 Speaker / Microphone Interface Instructions
The SMA2-LPC5 is a 2 zone two way public address, audio surveillance interface that is designed to connect to DVRs.
The SMA2-LPC5 can be used with any ETS Sound Surveillance speaker/microphone with the C5 option. The SMA2-
LPC5 can also be used with any 70v speaker and any Sound Surveillance pre-amplified microphone with the use of our
MIS-BOC5 breakout box. The SMA2-LPC5 is typically located near the DVR. Note-input and output signals on the SMA2-
LPC5 are “line level” only. The SMA2-LPC5 is for use in half duplex audio systems only. Audio whine or “feedback” will
result if both speaker and microphone are active at the same time.
Microphone / Speaker Placement.
Locate the speaker and microphone near the area of interest in the space to be monitored. If a large area is to be
monitored, locate the speaker and microphone in the middle of the space if possible. Avoid mounting the speaker/
microphone near air conditioning vents, light fixtures or electrical equipment. The speaker/microphone should be placed
as close to the subject(s) as possible. 5 to 10 feet is ideal. The speaker /microphones are still useable in the range of 15-
25 feet in public address applications 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: CAT5 between the SMA2-LPC5 amplifier / interface and the microphone/speaker (STW1-XX-
C5, MSI-C5-BO, or HSM11-C5 or CSM8-C5). Keep the cable run distances under 1,000 feet and away from AC power
sources, light fixtures and electrical equipment. Make connections as shown in Figure 1.
IMPORTANT
Wire the RJ45 connectors in the following manner. DO NOT wire as a standard Ethernet cable and do not cross
connections over.
Pair 1 1 CALL SW
2 CALL SW
Pair 2 3 SPEAKER (70V) +
4 SPEAKER (70V) –
Pair 3 5 MICROPHONE +
6 MICROPHONE –
Pair 4 7 +12V (MICROPHONE)
8 COM (MICROPHONE)
SMA2-LPC5 location and power: The SMA2-LPC5 interface box is designed to be located next to the DVR. The SMA2-
LPC5 requires a 120VAC power source within 3 feet of its location. If this is not possible in your application, you can
splice in up to 100 feet of 18 awg, 2 conductor cable to extend the distance between the AC power source and the SMA2-
LPC5.
DVR connections:
Connect the “audio outs” of the SMA2-LPC5 to the “audio ins” of the DVR. Connect the “audio ins” of the SMA2-LPC5 to
the “audio outs” of the DVR. Note-input and output signals on the SMA2-LPC5 are “line level” only. If the DVR uses screw
terminals for audio connections, simply cut off the ends of the supplied RCA patch cables, strip the wires back and
connect the wires to the DVR terminal blocks. The center conductor of a cut patch cable is + and the shield is -.
Adjusting the SMA2-LPC5 Levels:
Set both all level controls to 1/8 clockwise from full counter clockwise on the SMA2-LPC5 before powering the system up.
Adjust the controls + or – to the desired levels for both speaker and microphone. If the microphone sound at the DVR or
head end is distorted, rotate the control towards the – mark (counter- clockwise). Adjust the volume of the speaker to the
desired level. If the speaker volume is too high, amplifier oscillations may result. Turn the level control down if you
experience this.