Time/Rate Parameter; Damping/Depth Parameter; Master Output Section Description; Power Led - Mackie 406M Owner's Manual

TIME/RATE PARAMETER

If you have a reverb effect selected, this
control adjusts how long the reverberation
lasts, with 0 being a short reverb time and 10
being the longest.
If you have a delay effect selected, this
adjusts the amount of time between the origi-
nal signal and the delayed signal, with 0 being
a short delay time and 10 being the longest
delay time.
If you have a chorus, flange, or phaser effect
selected, this control adjusts the rate or speed
of the modulation of the effect.

DAMPING/DEPTH PARAMETER

If you have a reverb or delay effect selected,
this control adjusts how fast the higher frequen-
cies roll off in the reverberation or delay, with 0
having no roll off and 10 having the most roll off.
If you have a chorus, flange, or phaser effect
selected, this control adjusts the depth of the
modulation of the effect.

MASTER OUTPUT SECTION Description

POWER LED

This indicator lights up whenever the
POWER switch is turned on and the PPM Series
is plugged into a live outlet, just to let you
know you're ready for action.

MONITOR EQUALIZER

The MONITOR EQUALIZER is used to
shape the overall frequency response for the
monitor speakers on stage. This is called a
graphic equalizer because the position of the
sliders provides a graphic display of the
frequency response at its output. The equalizer
is the last thing in the signal chain prior to
being routed to the MONITOR LINE OUT
(and the power amplifier if the POWER AMP
ROUTING
switch is pushed in).
18

MAIN EQUALIZER

The MAIN EQUALIZER is used to shape
the overall frequency response for the main
speakers. The equalizer is the last thing in the
chain prior to the signal being routed to the
power amplifiers and the MIXER LINE OUT.
How to Adjust the Graphic Equalizers:
Note: These instructions are written on the
top of the PPM Series cabinet, but we'll repeat
them here because they are so important.
Reducing Feedback (Do monitor first)
1. Set the MIC channels to working volume
levels (see "Level Setting" on page 6).
2. Set the Graphic EQ sliders to zero (center).
3. Slowly turn up the MAIN MASTER
volume until feedback just begins to
occur. BE CAREFUL! Feedback can occur
quickly and become very LOUD, very fast.
4. Cut the appropriate slider until feedback
stops.
Suggestions for Better Sound
1. For better vocal sound, set the 125, 250,
and 16K sliders to +5.
Note: Make sure the singer is within 3 to
6 inches of the microphone. No amount
of EQ can save a vocal when the singer is
too far away from the microphone.
2. For more presence, set the 4K and 8K
sliders to +5.
3. To warm up the overall sound, set the 2K
slider to –5.
4. Use the RUMBLE REDUCTION switch to
reduce the noise floor.
5. REMEMBER, LESS IS BETTER.

75Hz RUMBLE REDUCTION

There are two of these switches; one for the
monitor output and one for the main output.
Pushing in this switch places a low-cut filter
into the circuit path, rolling off the frequencies
below 75Hz.
Use the RUMBLE REDUCTION switch on
the main output to reduce stage rumble (low-
frequency noise from footsteps picked up by
microphones on stage) and microphone-
handling noise. Use the RUMBLE REDUCTION
switch on the monitor output to reduce the
muddiness caused by the lows feeding back into
the main output through the stage microphones.
Note: This filter is separate from the graphic
equalizer. The main RUMBLE REDUCTION
switch affects only channels 1-6 and not the
stereo channels 7 & 8, EFX TO MAIN, or TAPE
IN. The monitor RUMBLE REDUCTION switch
does affect the EFX TO MON signal.