Mackie PPM1012 owner manual MON 1 Equalizer, Main EQ Assign, Power AMP Limiter LEDs

PPM1012

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PHANTOM

A(L)STEREOB(R)53

MAIN

LPF

12054

100 180

75Hz 200Hz

MONO OUT

55

This 9-band, constant-Q, mono graphic equalizer allows you to adjust the monitor 1 mix line-level outputs [10] and the speaker-level output [3] if the internal amplifier is playing the monitor 1 mix.

Each control allows up to 15 dB of boost and cut, with 0 dB (no change in level) at the center. The frequency bands are: 63, 125, 250, 500, 1 k, 2 k, 4 k, 8 k, and 16 kHz

The EQ comes before the monitor 1 fader [58]. Adjust the EQ carefully, in case you over-do it and take the stage monitor 1 levels into overload. As with the channel EQ, just take it easy. There are no prizes for who can EQ the most (or is there?). If lots of EQ seems to be needed, then chances are your system can be improved by careful re-positioning of the mi- crophones and other equipment.

You will find this EQ useful for reducing feedback in the stage monitors. Stage monitors point towards the performers and their microphones, so feedback can often occur. You can reduce the level of the problem frequency band, by adjusting the graphic EQ sliders.

46. MAIN EQ ASSIGN

This delightful little switch allows you to assign the main equalizer [44] to either the main mix when pressed out, or to monitor 2 when pressed in.

FX RTN 1

dB 10

5

5

10

20 41 30

SOLO

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60

OO

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FX RTN 2

dB 10

5

5

10

20

30

SOLO

40

50

60

OO

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MON 1

dB 10

5

5

10

20

30

SOLO

40

50

60

OO

58

MON 2

dB 10

5

5

10

20

30

SOLO

40

50

60

OO

58

MAIN

dB 10

5

5

10

20

30

40

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60

OO

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This is useful in cases where your monitor 2 mix is having feedback troubles or needs your special touch.

If you are not using the monitor 2 system, keep this switch out. The EQ will then operate on your main left and right mix.

47. POWER AMP LIMITER LEDs

These independent LEDs turn on when power am- plifier channel A or B is being overloaded internally and its internal automatic limiter is actively working.

With this constant-Q graphic EQ, the band-

width (and Q) of a frequency band doesn't

vary with the amount of boost or cut, and 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 set- tings.) The position of the sliders gives a good indica- tion of the frequency response across the audio band. With non-constant types of EQ (on other mixers), 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.

The LED will pulse in time with how much the limiter is being used.

If the limiter LEDs come on and stay on for more than a second or two, it means the power supply has overheated and the limiter is holding the amp signal down to 1/4 power until the power supply cools down enough to release the limiter. If this happens, check there is good ventilation around the mixer, and that you are not cranking it too much. Also make sure that your speakers are OK, and are not less than 4 ohms impedance.

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PPM1012