It is inevitable that Shandong public address sound system will have large and small problems when it is used. At this time, we should find out the reasons in time and solve them as soon as possible. Otherwise, small problems will also become big problems. The following sections will explain common problems to you.
Linear input signal source
Input the line of the preamplifier or the mixer into the signal source, such as the computer, DVD, tuner, etc., unplug them in turn, check whether the noise disappears, and then determine which signal source the noise is introduced into the system; Generally, the noise introduced by linear input signal source may be less, and sometimes it is generally caused by computer or tuner.
Take the power supply of the computer and the preamplifier to the same socket, or replace another computer or laptop for testing. Generally, there is a noise caused by potential difference between the computer and the preamplifier, and the intermediate audio isolator may be improved. Or the computer and preamplifier can share a power supply, or the computer power ground wire can be removed.
In general, the tuner power is turned on to introduce noise, and the noise is caused by poor reception signal. Turn off the tuner power. If you want to use the tuner, you can add an outdoor antenna according to the effect to solve the problem of weak reception signal.
Microphone input signal source
Unplug the microphone signal input line in turn, such as wired microphone or wireless microphone; Then check whether there is any noise in the speaker, and determine which microphone is introduced into the system;
The introduction of wireless microphone may be caused by interference in the frequency band of wireless microphone. If the wireless microphone can adjust the frequency, adjust the frequency test;
It may also be the noise caused by poor grounding of the receiver. If the receiver is fixed to the cabinet, it may also cause noise. Remove the receiver from the cabinet and test whether the noise disappears after isolation from the cabinet. If it disappears, put the receiver pad paper or foam on other equipment or tray.
The introduction of wired microphone is generally caused by the long wired microphone cable (40 to 50 meters and above). Replace the short microphone cable for testing. The noise introduced by the long wired microphone cable is generally difficult to deal with. When laying the long microphone cable, it is generally required to use the RVVP (two core tape shield) cable with good quality. It may be helpful to add an audio isolator between the microphone cable and the preamplifier.
Power amplifier or preamplifier
When the sound source is not connected, that is to say, the preamplifier does not have any input signal source, and there is only one signal line between the preamplifier and the power amplifier,
If there is still noise, unplug the cable and check whether there is still noise in the speaker.
If the noise disappears, the problem lies in the preamplifier. If another preamplifier replaces the test, send it back to the preamplifier for maintenance or replacement.
If there is still noise, the problem is the power amplifier. If there is another power amplifier to replace the test, the faulty power amplifier will be sent back to the company for maintenance or replacement.
This is the end of the FAQ of the public address system. If you don't know anything about it, please come to our website https://www.wenguangzhineng.com Ask about it!