MACKIE PPM1008 - Manual (Page 16)

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PPM1008
PPM1008
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 [34] so you
can connect guitars directly.
• The mono 3-band EQ has shelving high, low,
and peaking mid EQ with sweepable frequency.
• 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,
stereo line-level input, or stereo RCA inputs.
(The mono mic input of each stereo channel is
split equally to left and right).
• The stereo channel 4-band EQ has shelving
high, shelving low, peaking lo-mid, and hi-mid.
“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 [32].
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 [31].
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 [51] lets you choose which
is used. Post is used for FX, and pre is for monitor 2.
FOOT SWITCH
FX
/
OUTPUT POWER: @ 4 OHMS, 800 WATTS PEAK PER CH
MINIMUM LOAD: 4 OHMS PER CHANNEL
2 X 800W PROFESSIONAL POWERED MIXER
2 X 800W PROFESSIONAL POWERED MIXER 21
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