PPM608
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26. OVERLOAD (OL) LED
This LED will come on when the channel’s input signal is too high. This should be avoided, as distortion will occur.
If the LED is coming on regularly, check that the gain switch [28] is set correctly for your input device: Set it to low if you are using a
27. CHANNEL LEVEL
This adjusts the level of each channel onto the main mix. The “U” mark indicates unity gain, meaning no increase or decrease of signal level. All the way up provides an additional 20 dB, should you need to boost a section of the band. If you find that the overall level is too quiet or too loud with the level near unity, you’ll want to confirm the gain switch is set correctly.
28. GAIN SWITCH
Press this in (low) if you are connecting a
Press this out (high) if you are connecting a microphone
Note that the gain switch has no effect on the line- level inputs and RCA inputs of channels 7 or 8.
Switch | MIC (XLR) | LINE (TRS) |
position | Inputs | Inputs |
IN (LOW) | Gain = 25 dB | Gain = 0 dB |
OUT (HIGH) | Gain = 45 dB | Gain = 20 dB |
This is the first control that the input signals meet. It allows you to choose the level depending on the type of input source you have connected. If it is set incorrectly, then the input signals may overload the mixer, causing distortion, or it may come in too low, and be lost in noise.
The gain switch allows you to make the initial level adjustment, appropriate for the connected device (mic or instrument, for example). The channel level controls
[27]are more for
18 | PPM608 |