Ashly PQX-572 Betriebshandbuch - Seite 6

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Operating Manual - PQX 571 and PQX 572 Parametric Equalizer

PQX 571 Parametric Equalizer

Compressor - Limiter

Crossover

Power Amplifier

TYPICAL APPLICATIONS

6.1

Connecting Into a Sound System

Typically an equalizer is used in a sound system

which has a mixer or some other sort of preamplifier. In

such cases, the equalizer normally should be connected

after the mixer but before any electronic crossovers or

limiters. The PQX equalizers are line level devices de-

signed to operate at nominal +4 dBu signal levels; there-

fore, the equalizer should not be connected directly to

microphones, phonograph players or low level musical

instruments.

6.2

General Tone Control

The parametric equalizer is a very useful device

for general tone shaping because the filter's center fre-

quency, bandwidth and level are all continuously vari-

able. To use the power of the equalizer effectively, you

need to translate your idea of the tone you want to pro-

duce into a range of numerical frequencies. This is simple

after a little practice. Here are a few references which

are useful for starting points:

Very low bass (the "wind" in a kick drum, al-

most felt as much as heard -40Hz-80Hz.

The low register of a male voice - 200Hz

The low register of a female voice - 350Hz

Mixer

Typical Sound System Design

Lower midrange ("warmth" frequencies) -

400Hz-1KHz

Upper midrange ("harshness", snare drum "bite",

"hot" sound) -2.5KHz-4KHz.

Sibilance ("sss" sounds, cymbal "sizzle") - 8KHz-

15KHz.

Try using these starting points as a guide when

you want more or less of these types of sounds. Adjust

by ear from there. It is always a good idea to remember

that a little equalization usually works out much better

than a lot, and that there are many audio problems which

cannot be solved with equalization alone.

6.3

Feedback Control

The PQX equalizers are powerful tools when ap-

plied to eliminating feedback problems. On a traditional

graphic equalizer, the fixed filter center frequencies are

insufficient when the frequency of feedback occurs be-

tween two slide faders, or is extremely narrow. The con-

tinuously variable center frequency and bandwidth of a

parametric equalizer allows very sharp notching of feed-

back frequencies.

The following procedure outlines how to use a

parametric equalizer to suppress feedback frequencies:

1. Start with all the PQX EQ switches out ex-

cept the master EQ switch in and the master Level

at 0.