2. Graphic equalizer frequency adjustment problem: common have the swallow type mountain type wave type three kind of spectrum of wave shape, above waveform are tuner people imagine graphics, not demand the waveform of acoustic field practice, we know that the ideal sound field frequency characteristic curve should be relatively smooth, if the human by the imagination to adjust sound field frequency characteristic curve, incredible results is counterproductive.

3. Pressure limit adjustment problem: common basic doesn't work is to do the decoration and function of excessive counterproductive. Can make do with the former, the latter will have serious impact on system dynamic, the voice of the not to come out, the more obvious performance is London the strong sound of the natural weaken the singer.

4. System level issues: first is power amplifier the lack of flexibility control switch to turn the system to do zero level adjustment. Sometimes mixer channel to push a little output has very big, this kind of situation will affect the system dynamic and distortion.

5. The bass signal disposal: the first one does not do electronic frequency division directly with all frequency signal to power amplifier to promote sound box; The second I do not know from where the system to extract the bass signal disposal. Suppose do electronic frequency division directly with all frequency signal to power amplifier propulsion speaker speaker voice also not burn unit, but in its low unit full frequency sound incredible; But if the signals from the improper position in the system will be brought to the site control need not to bother.

6. Effect loop disposal: should take pusher rear signal, to prevent the effect is not controlled to provoke up screaming, phone return to conditional takes along the channel, such debugging more lunch.

7. Line linking process: common large sound system communication interference is lines formed cohesion process was not well done, and the system is balanced turn not balanced and unbalanced turn balanced connection must be in accordance with the specification. And don't use inferior connectors.