And testing, debugging should do work as follows:

( 1 ) check the architectural acoustics conditions

Sound insulation, acoustic defects, decoration may have defects, change some obvious defects must be changed

( 2) check the speaker equipment and layout

A dance hall by the speaker is the same brand, the same series, whether the power amplifier is the same brand. Bree: speaker is reasonable as cabaret or Cara OK hall is to maintain sound like two? Sound pressure level can not meet the requirements? Will cause obvious interference of sound? From the point of anti interference treatment; from the low frequency loudspeaker mounted is reasonable.

( 3) examination system block diagram, the correctness of system design, equipment matching is reasonable, correct and reasonablematching, and the power amplifier is set to 4 / 5 attenuation button (three o'clock ) position. The frequency divider, limiter, equalizer volume control in OdB.

( 4) ready to work, will test signal is fed to a mixer, pushing the total output, the channel status should be balanced.

( 5) tested each speaker spectrum, do center several, if damaged or abnormal situation immediately notify the relevant aspects.

( 6) check the speaker phase:

The main speaker channel A opened, from the mixer into a broadband test signal. The measured - - such as 80dB, and then open anotherchannel B, such as sound level sum is in-phase, or phase contrast. Can change the speaker line correction. After correction, close B channel, open C channel and C channel correction. In order to complete all the speaker phase correction.

( 7) correction of microphone phase.

Acoustic input method will apparatus connected with a 1. SCT produces broadband pink noise signal through the PA microphone, amplifiedby A PA equipment from speaker, microphone in the presence of test used to measure a sound pressure level, such as 80dB, again anotherway B B PA microphone, microphone channel adjustment gain and A pathways.. and the B near A, such as the sound pressure levelimproving, illustrate the same phase, otherwise the opposite phase, phase can be achieved by converting mixer phase switch or replace themicrophone dual-core line to change. In the microphone phase correction work effects mixer level meter can also be observed in the output size, but a lot of light-emitting diode indicator 0.1DB resolution, easy observation.