This is called a graphic EQ, or G-EQ. And the way that we are gonna find which frequencies are problematic in the room is by creating feedbacks. We are gonna create that on purpose. And this is how we gonna find out which frequencies we should take out of the room.
But to add to that, you have different EQ. Because we are analog we can choose. Either this EQ will be connected to our master, to our main, or to the monitor, but because this EQ only have two channels, and we want to EQ the room, right? So we are gonna connect it to the master, what means that everything that’s coming out from the mixer, from the main left right, is gonna pass through this machine and go to the amplifiers.
So this is a step in between.
Let’s have a look in the back. This is the EQ and we have channel 1 and channel 2. As we see it’s very simple, something comes in and something comes out. This is our master. I’m gonna start with master right, so I need a cable to extend it. I want the master to go through this. Can you connect it to the right channel? Cool. So now the right master is inside of this device.
Now the right output go to this device and then go to the amplifier. Now we have the left side. Cool. Now our master is going through this device and through the amps and to the speakers. Now it’s on.
Basically what we are gonna do is to put up the gain, very very high, much higher then usual, okay. And I put the main door on to be ready, and now I’m slowly gonna put up the fader of the channel till we have a feedback. Again.
Oh it’s 200 herz. This was 250. This is exactly the feedback that we get all the time, the devil frequency.
A new one. Is it low or high? High. Okay that was 2 kilo herz. Now we have a new one. We usually around three to four to maximum five frequencies then we stop.
400. Now it’s not accidental that it was 200 and then 400 because a lot of time it’s the multiple. And then after we find we make a wave because we still need these frequencies. So first we cut them completely to know which ones are problematic, and then we create a little wave.
So whatever I did on the top one I did also on the bottom one.
And another thing that I like to do is in the edge of it to also make a little wave. All the first three, like after 40herz, and also highest ones, I kind of just take out, and last thing is that just like it is for the main PA, we can also do it for the monitors.