Mackie PPM608 Owner's Manual - Page 16
Channel Controls - set equalizer
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PPM608 21 22 23 24 25 26 27 28 29 30 30 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. Mono Channels 1 to 6 • Channels 1 to 6 are mono channels, and their controls affect either the mono mic input or the mono line-level input. • Channels 1 to 4 have a built-in signal in-line compressor circuit with adjustable threshold. • Channels 5 and 6 have a hi-z switch [30] so you can connect guitars directly. • The 3-band EQ has shelving high, shelving low, and peaking mid EQ. • The mono signals are split equally to the left and right of the main mix. • The stereo channel EQ is a 3-band design just like the mono channel EQ. "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. 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 gain-selectable preamp. The signal then passes through the compressor circuit (ch. 1 to 4 only), then through the channel EQ, and the channel level [27]. Stereo Channels 7 to 8 • Channels 7 and 8 are stereo channels, and their controls affect either the mono mic input, stereo line-level input, or stereo RCA inputs. (The mono mic input of each stereo channel is split equally to left and right). 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. 16 PPM608