ALLEN & HEATH PA20 User's Guide download pdf (Page 19)

PA User Guide 19

EQUALISER

The stereo equaliser allows independent

adjustment of the low and high frequency bands.

HF The high frequency band has a shelving response that

cuts or boosts the higher (treble) frequencies by up to 15dB. It

has most effect from 12kHz and higher.

LF The low frequency band has a shelving response that cuts

or boosts the lower (bass) frequencies by up to 15dB. It has

most effect from 60Hz and lower.

 The EQUALISER is based on the classic Baxendall

design similar to that found in audiophile hifi systems. Its

shelving response has an increasing effect as it approaches

the low and high frequency extremes.

☺ Using the equaliser It is best to keep the adjustments

made using the equaliser as small as possible. Avoid the

temptation to excessively boost the low and high ends to

compensate for poor speaker frequency response. This simply

overworks the amplifiers with little audible improvement from

the speakers. Using cut rather than boost is often more

effective in improving the clarity of the signal. For example, use

HF cut to quieten a hissy keyboard, some LF and HF cut to

shape a reverb return, and LF to cut back low frequency hum

or resonance. On the other hand, a small amount of HF boost

can brighten up a dull recording, or add some ‘air’ to keyboard

string sounds.

AUX SENDS The stereo channel aux sends function in

the same way as described previously for the mono channels.

Note that the L and R signals are summed together to produce

a mono send for each of the four auxes.

BAL Adjusts the level balance between the L and R signals.

At its extreme ends one signal is fully off, the other fully on.

The control has a 3dB attenuation at its centre position to

ensure equal total power as the balance is adjusted.

MUTE, PFL, PK! And FADER Function in the

same way as described previously for the mono channel. Note

that the stereo signal is summed to produce a mono PFL feed.

The PK! Indicator senses the higher of the L and R signal

levels. The fader controls the L and R signals together.

To avoid loud clicks or unexpected noises always

mute the channel before plugging or unplugging the inputs.

Use PFL to set the channel gain before raising the channel

fader and sends.

10k1kHz100 30k10

LF HF

STEREO EQ

-15

-20

-10

-5

0dB

+10

+15

+20

+15-15

60Hz

12kHz

+15

-15

PK !

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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ALLEN & HEATH PA20 User's Guide Page 19

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