YORKVILLE Power MAX Manuel De L'utilisateur page 11

activity. If only one or two channels are causing feedback, the best solution is to adjust the channel EQ or,
better still, connect monitor-feedback-prone mics to the channels with OVERLOAD PROTECTION. If, on
the other hand, a larger percentage of the monitors are having feedback problems, use one or both of the
MON EQs to cut monitor level at the feedback frequencies.
VU-Meter, SOLO MODE Button, AFL & PFL LEDs
The VU-METER reflects either the post-EQ, post-SPEAKER PROCESSOR main bus output levels, or
the SOLO bus levels. Flashing of the yellow LEDs at +2 and +4 should coincide with flashing of the
AMP A and/or AMP B AMPLIFIER FULL POWER LEDs. The red +7 and +10 LEDs indicate that the
main mixing bus is overloaded.
The SOLO MODE button allows you to switch between AFL and PFL. AFL mode allows you to view
post fader levels in the channels, effects to L&R in the EFX returns, and the MON1 / MON2 mix levels.
PFL mode allows you to view pre-fader levels in the channels (even muted channels), effects input in
the EFX returns, and the MON1 / MON2 mix.
• The AFL and PFL LEDs indicate which solo mode is currently in effect.
To view the main system levels, release all the SOLO buttons so that neither the PFL nor the AFL LED
flashes. To check SOLO levels, press for PFL. Occasional peaks between +7 and +10 will not reflect
actual clipping, however if such peaking becomes continuous, reduce either the channel fader levels
if you are in AFL mode (or the input level of the SOLO source if you are in PFL). – Look for the illumi-
nated SOLO LED and turn that master down.
HEADPHONES Level Control and Output Jack
The level control regulates the output of the headphone amplifier. The headphone output jack is located
on the front of the mixer beside the PHANTOM POWER button. The headphone program originates
from the main L/R bus unless a solo is active in which case it originates from the SOLO bus.
Amplifier AMP A, B, C & D Inputs
Each AMPLIFIER INPUT uses a switching jack
that cuts off internal signals routed to the power
amp when a jack is inserted.
The AMPLIFIER INPUT's have a few possible
uses. For example, they enable you to access, and
isolate the main power built-in amps so that they
may be used in conjunction with an electronic
crossover. (Used to bi-amp subwoofers and full-
range speakers.) In this case you would patch
as follows... 1) POWERMAX L / MONO LINE
LEVEL OUTPUT to the crossover's input (if it is
a stereo crossover, pick one channel and use its
input). 2) From the crossover's low -frequency, or
subwoofer output to the POWERMAX AMP A INPUT. 3) From the crossover's high frequency output to
AMP B INPUT. 4) Now, connect the subwoofers to the AMP A SPEAKER output/s and the full-range cabi-
nets to the AMP B SPEAKER output/s.
Two 8-Ohm full-range speakers, and two 8-Ohm subwoofers can be powered this way. Actually, if you
have a 3-way crossover or processor and only need one monitor power amp, you can tri-amp by using
AMP A for subs, AMP B for woofers and AMP D for horns and/or tweeters.
Alternately, the AMPLIFIER INPUTS can be used to slave one or more of the power amps – perhaps
if the mixer is connected to a rack of amps and now the built-in amps are free to be used for other
things. In another case, you might be using the POWERMAX L&R LINE LEVEL OUTPUTS, also MON1
& 2, patched into four of another mixer's input channels. Now you may want to amplify the full mix
coming out of that other board including whatever it's doing (possibly you're jamming with another
group and you need extra channels). You would simply patch its main and monitor outputs into the
appropriate AMPLIFIER INPUTS and now the two mixers are linked and the POWERMAX amps are
ready to power up main and monitor speakers.
Amplifier Full Power LEDs
The AMPLIFIER FULL POWER LEDs are located in the upper right
panel area just above the main EQ. They indicate that one or more
power amp limiters (all non-defeatable) are working. The more
FULL POWER LED activity, the more limiting. Limiting begins 10dB
down from the onset of clipping and tends to be sonically transpar-
ent unless these LEDs are working constantly.