YORKVILLE MP8D Manuel De L'utilisateur page 9

GENERAL OPERATING INSTRUCTIONS
1. Connect the AC power cord to a 120Volt AC grounded power outlet (220 to 240 Volts
in export units).
2. Turn the MAIN and MONITOR MASTER controls to 0 for now, then switch on the POWER.
3. You can connect low-impedance microphones to the 3-pin XLR type MIC inputs.
4. Connect mono, line-level signal sources (i.e. amplifier line outputs, the output of a mono
mixer, an electric instrument, an external effects unit, etc.), to the 1/4" BAL LINE IN jacks
on channels 1 to 6. Do not connect more than one signal source to any of these channels,
that includes stereo outputs (if you try to connect a stereo source to a mono channel using
a Y adapter, you may get distortion).
5. Connect stereo sources (tape deck, CD player, stereo keyboard instrument, an external effects
unit, etc.) to channels 7 and/or 8 via the dual RCA (phono) type inputs. Once again, connect
only one signal source per channel, and use shielded patch cords for all pre-amp connections.
6. Using 18-gauge, or heavier, speaker cables (never use shielded patch cords to connect speak-
ers, they cannot handle the high current and will waste power by heating up), connect one or
two 8-Ohm main PA speakers to the SPEAKER outputs on the back panel. If you have 4-Ohm
speakers, you should connect only one to each amplifier. (Note: to deliver maximum power
to a pair of 8-Ohm main PA speakers, connect only one speaker to each amplifier).
6a. If you are employing a separate power amplifier for the monitor speakers, connect the main
speakers as in (6) then run a shielded patch cord from the MONITOR LINE OUT jack to the
input of the monitor power amp. If you are employing a separate graphic equalizer for the
monitors, run a shielded patch cord from the MONITOR OUT jack to the input of the
Equalizer. (A good idea: remember there is no channel EQ on the monitor signals and the
built-in graphic EQ is only for the main PA sound). Then, another patch cable from the EQ's
output to the input of the monitor power amp. If you are using AMP A or B to power moni-
tors, connect an EQ between the MONITOR LINE OUT and the appropriate AMP IN jack.
7. Position your main PA speakers at the front of the stage, pointing directly out at the audi-
ence. Position your monitor speakers on the stage floor, in front of the mic stands, pointing
up at the backs of the mics. (Remember to use cardioid or uni-directional mics to reduce
the threat of monitor feedback).
8. During a sound check, with the band playing, or other sources feeding the mixer inputs,
make the following control adjustments:
i. Set the channel LOW and HIGH EQ controls at center. Now, set the channel GAIN,
MON, and EFX controls at 0 and the GRAPHIC EQ sliders at center position.
ii. Turn up the MAIN and MONITOR MASTER controls to approximately 7or 8, the MAIN
EFX master to around 7 and MONITOR EFX master to 5.
iii. Turn up the channel GAIN controls slowly until each channel can be heard at the
desired volume level through the main PA speakers.
iv. Turn up the channel MON controls until the performers can hear themselves at ade-
quate volume levels without feedback.
v. Turn up the EFX controls on those channels requiring effects. Usually this would be
the lead and harmony vocal channels. Reverb may be used on other channels or on
recorded music, but at low levels.
9. Feedback during a performance is usually caused by one of the monitors. The main PA is
less likely to feed back because the mics are so far away from the main PA speakers.
Therefore, if you are using monitors and feedback occurs, try the following procedures:
i. Turn the MONITOR master down until the feedback stops.
ii. If you have a graphic equalizer patched between the MONITOR output and your
monitor power amp, pull down one or two (but not more) of the EQ sliders in the fre-
quency range where the sound seems to be occurring.
iii. Now turn the MONITOR master back up. If the feedback recurs, push the EQ slider(s)
back up to center position and try pulling down one or two others.
iv. In the case of main system feedback, follow the above type of procedure, but using
the MAIN master and the built in GRAPHIC EQ.
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