C613M-A (5/05) 13
CONNECTING AUDIO The SP04-140 supports half-duplex, bidirectional audio (one direction at a time). It transmits audio and video signals simultaneously. This lets
you control a loudspeaker or other audio equipment, such as a door intercom system, at the monitored location.
The unit supports both microphone and line input levels. Microphones are usually not powered; they have weaker signals that must be amplified.
Line inputs usually have stronger, powered signals that have already been amplified.
NOTE:
Use either microphone/speaker or line in/line out. The SP04-140 does not support mixed audio signal inputs and outputs.
Figure 10.
SP04-140 Audio Connections
To implement audio:
1. Select the type of audio signal:
Mic/Spkr
Switch to Mic/Spkr if you are connecting a microphone or a speaker. The microphone input level is 5 mVp-p. The speaker
output level is 2.5 Vp-p.
Line
Switch to Line if you are connecting a powered audio input or output device. The line input and output level is 1 Vp-p.
By default, the switch is set to Line.
NOTE:
If the switch setting does not match your audio equipment, audio distortion problems may occur.
2. Make sure the input and output audio connectors are wired as follows:
Connector Tip
Signal high
Connector Sleeve
Common
3. Connect a line input device or microphone to the blue 3.5 mm audio in monaural connector. A preamplified microphone is recommended.
4. Connect a line output device or speaker to the green 3.5 mm audio out monaural connector.
NOTE:
Audio out is not supported at this time.
AUDIO PREAMP
MIC/SPKR
LINE