MACKIE PPM1008 - Manual (Page 20)

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PPM1008
PPM1008
Master Controls
35. POWER LED
This LED comes on when the powered mixer is
plugged into the correct-voltage AC mains supply,
and the rear panel power switch [2] is on.
If the LED does not turn on, make sure the AC power
is live, both ends of the power cord are correctly
inserted, your electricity bill has been paid, and the
lights in town are still on.
36. MAIN MASTER GRAPHIC EQ
This 9-band graphic equalizer adjusts the main mix
output. It affects the line-level outputs [19], as well as
the main speaker-level outputs if the internal amplifiers
are playing the main mix.
Each slider allows you to adjust the level of its
frequency band, with up to 15 dB of boost or cut, and
no change in level at the center (0 dB) position. The
frequency bands are: 63, 125, 250, 500, 1k, 2k, 4k, 8k
and 16 kHz.
The EQ section comes after the main level [38], and
just before the main meters [40]. Therefore, as you
adjust the EQ, you can keep an eye on the meters in
case you over-do it and take the levels into overload.
As with the channel EQ, just take it easy.
There is a large amount of adjustment, and if
you are not careful, you can upset the delicate
balance of nature. Although it may not seem
cool to turn down controls, with EQ it is often
your best option. Turn down the offending
frequency range, rather than boost the wanted
range. Having many sliders will allow you to
reduce the level of some frequency bands where
feedback occurs.
With this constant-Q graphic EQ, the
bandwidth (and Q) of a frequency
band doesn't vary with the amount of
boost or cut. The adjustment of one
slider has minimal effect on adjacent bands
for all settings of the slider levels. (There's
always some effect on adjacent bands to avoid
too much variation or ripple between bands,
but the constant-Q design keeps this fairly
constant for all settings.) The position of the
sliders gives a good indication of the frequency
response across the audio band. Non-constant
types of EQ (on other mixers) give a wider
bandwidth for lower levels of boost or cut, and
narrows as the level goes up or down. For
example, if you're boosting 500 Hz and 2 kHz slightly,
the 1 kHz band will also be boosted, even though the
1 kHz slider is in the flat position.
37. FX TO MAIN
This knob lets you adjust the level of the internal
effects being added to the main mix. (It is a stereo
control, as the output from the internal effects
processor is stereo and is added to the left and right
main mix.)
Adjust the FX level being added, compared to the
other channels playing in the main mix.
At the fully-down position, no effects are added, the
center U mark is unity gain, and 10 dB of effects gain is
available at the fully clockwise position.
38. MAIN LEVEL
This knob controls the overall level of the main mix,
and affects the main meters [40], main line-level
outputs [19], main sub out [18], and the main
speaker-level outputs if the internal amplifiers are
playing the main mix. The level adjustment occurs
before the EQ [36].
This gives you ultimate control over your audience.
Adjust it carefully, with your good eye on the meters to
prevent overloading, and your good ear to the levels to
make sure your audience is happy.
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
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