Weak current College】 【equalizer to adjust some of the problems and troubleshooting --- Power By】 【China power house network.

Equalizer: Equalizer is the peripheral equipment with the greatest number of devices, so we also need to pay special attention to the following that adjust Equalizer is need to pay attention to some problems and troubleshooting:
1, there are some sound mixer will have 7-9 equalizer, the equalizer only simple adjustment of timbre, belongs to a secondary character, so we use it is best not to such an equalizer for big upgrade, otherwise the mixer main output level tend to be exceeded. Then an equalizer in general have a switch, use this switch when you want to pay attention.
2, some dual channel 15 Equalizer will have a State transfer switch, you can handle double-channel 15 Equalizer converted to single channel 30 equalizer, you will have to pay attention to see every section and then adjust the frequency.
3, we currently use the most is the dual channel 31 equalizer, note the following points:
A, 6dB and 12dB switch: there are some Equalizer 6dB and 12dB working state transfer switch, normally or adjust better at 12dB.
B high-pass, low pass, or: some equalizer has low pass and high pass adjustment function, adjustment, note that if you put too much bass attenuation of the sound is not too thin a full; the treble attenuation of too much sound too gloomy not penetrating power.
C, frequency sliding key: adjust when the equalizer for each frequency sliding key to see if normal; at the same time note sliding keys don't do too much decay or upgrade, especially when upgrading will not exceed 6 dB.
D, connection: Equalizer input and output are XLR card Lennon and TRS two ports, in addition to the shape is not the same, the function is the same, but in fact are balanced line port, so we connect the equalizer to use when you "signal cable XLR card and TRS6.35 stereo signal cable to do the balance connection.
Equalizer failure examples:
1, a time to help a friend's dance tune, discovery singers singing on stage left without transfusion, to the right when you occasionally have to sing into phenomenon, I first looked at the mixer left and right channels of the output signal is balanced, and then look at the amplifier's volume for the two channels is balanced, then check the peripheral equipment of various input output volume is good, finally found the equalizer right channel for adjustment to 6dB, adjust the left channel in normal 12dB, transfusion of the points in this Equalizer 800Hz, left and right channels to 800Hz frequency attenuation 8 dB, left channel at 12dB State attenuation 8 dB course is normal, no problem; but the right channel of the State of seemingly 6dB attenuation 8 dB actually to divide by 2, then becomes a 4 dB, Equalizer right channel corresponds to the right of the stage, so the primary speaker stage right speaker 800Hz Department transfusion is not strange, at which point the right channel for adjustment back to 12dB fault is ruled out.
2. once in the friends there watching him get an outdoor show, their old equipment in particular, the use of the equalizer has several sliding keys are lost, when I always feel that there is one side speaker sound urn URN, carefully watch the equalizer left channel 630Hz of sliding key off, leaving it a bit, but this was still a little bit, that means the 630Hz high above the frequency up to 12 dB, the sound is not only the URN urn sound strange that I air immediately let a friend with a small screwdriver to adjust the frequency of sliding key to failure is excluded in the normal position.
3. once helped a unit overhaul of a sound, they say there is no sound from a channel, I looked at the other device basic no problem, this system Equalizer output XLR and TRS card you have received the signal output port, then find the right channel TRS stereo signal cable plug inside the circuit, this also caused the right channels of XLR card Lennon ports may short circuit, because the equalizer internal XLR and TRS port lines are linked. Replace the plug after fault TRS6.35 stereo is ruled out.