Yorkville PGM8 User Manual download pdf (Page 10)

8. L/R Main EQ

This is a stereo 7-band EQ on the output of the MAIN fader. The EQ’s adjustment range is +/-12 dB

with frequency centers at one-octave intervals from 125 Hz to 8 kHz.

Use the Main EQ during a sound check to carefully adjust the main speaker response (you

shouldn’t have any radical boosts). It is also useful for minimizing feedback, but remember

that stage monitor speakers are most often the cause of your feedback problems. Naturally,

stage monitor feedback will also be heard out the main speakers at the mixer station, which

can lead you to the illusion that the main system is the cause.

When setting the Main EQ, do not automatically go to a smiling curve as with a home

stereo – this will cost your system both headroom and gain before feedback. Initially,

keep the EQ curve as close to flat (all sliders at center) as possible, then make neces-

sary minor adjustments as required during the sound check to cut feedback frequencies.

When feedback is heard first turn down the MON fader. To reduce the possibility of the

main speakers causing the feedback cautiously turn up the Main fader to the onset of

feedback. Try to guess the frequency of the ringing tone. Reduce the Main EQ fader

closest to the frequency of the feedback. You should only need to reduce the fader to

about -3dB on the front panel EQ scale. Cautiously turn up the Main fader a little more to

the onset of feedback. Try to guess the frequency of the 2

ringing tone which will most

likely be different than the first feedback frequency. Reduce the Main EQ fader closest to

the frequency of the feedback. Again you should only need to reduce the Main EQ fader

to about -3dB on the front panel EQ scale.

Typically there are about three major feedback frequencies that you can compen-

sate for with the Main EQ. Now with the main fader placed in your performance

gain position slowly turn up the MON fader to obtain enough monitor volume with-

out causing feedback.

9. Phones Level

The Phones level control adjusts the stereo audio level to the headphones plugged into

the Phones jack. The audio signal for the headphones is post Main EQ so that you can

hear exactly the audio signal on the Main Out phone and Main Out XLR jacks.

The Phones (headphones) jack is a stereo jack compatible with headphones having an

impedance down to 8 ohms but we recommend for best performance using headphones

with an impedance of 80 ohms or higher.

10. Break Switch

The Break switch is a great feature. When the Break switch is pressed on and the

Break LED is blinking the audio signals from channels 1 to 8 are muted. While the

Break switch is on you can play music through the Media In jacks. Great for when

the band goes on break, or while showing a video during a presentation muting room

noise picked up by the vocal microphones.

11. VU-Meter

The VU-Meter indicates the post Main EQ left and right audio levels. A good operating

level is when the music peaks light up the 0dB LEDs. Having the yellow +3dB and +6dB

LEDs flash occasionally is acceptable but you do not want the red +10dB LEDs coming on

as this indicates the possibility of clipping.

Top Panel Output Jacks

The Main Out, Mon Out and EFX Send phone jacks on the top panel are TRS (balanced

tip ring sleeve configuration) output jacks. Use them to connect to balanced and

unbalanced audio inputs.

The Stereo Rtn jacks are TRS balanced input jacks. You can connect to the balanced or

unbalanced outputs of audio equipment.

The Phones (headphones) jack is a stereo jack compatible with headphones with an

impedance down to 8 ohms but we recommend for best performance using headphones with

an impedance of 80 ohms or higher.

Keep the Main Speakers

between mics and audience

to minimize feedback

DO NOT place Main

Speakers in back of

the stage!!

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Yorkville PGM8 User Manual Page 10

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