PPM608
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Channel Controls
The eight vertical channel strips look very similar, with only a few differences between them. Each channel works independently, and just controls the signals plugged into the inputs directly below it.
“U” like Unity gain
Mackie mixers have a “U” symbol on almost every level control. It stands for “unity gain,” meaning no change in signal level. The labels on the controls are measured in decibels (dB), so you’ll know what you’re doing level- wise if you choose to change a control setting.
Mono Channels 1 to 6
•Channels 1 to 6 are mono channels, and their controls affect either the mono mic input or the mono
•Channels 1 to 4 have a
•Channels 5 and 6 have a
•The
•The mono signals are split equally to the left and right of the main mix.
Stereo Channels 7 to 8
•Channels 7 and 8 are stereo channels, and their controls affect either the mono mic input, ste- reo
•The stereo channel EQ is a
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Signal Flow
The block diagram on page 29 shows the signal flow, but here is a short description of the flow through the channel strip section:
The mic inputs and mono line inputs each feed a preamplifier whose gain is set by the gain switch [28]. The stereo channel line inputs and RCA inputs do not go through a
The signal then passes through the compressor circuit (ch. 1 to 4 only), then through the channel EQ, and the channel level [27].
The mon 1 control [21] taps the signal off just before (pre) the channel level.
The FX/mon 2 control [22] taps the signal off before (pre) and after (post) the channel level. The FX send/ mon 2 send switch [47] lets you choose which is used. Post is used for FX, and pre is for monitor 2.