Ashly mXa-1502 12-Channel 4-Zone DSP Mixer-Amplifier - Manual (Page 18)

Parametric Equalizer
The PEQ parametric equalizer provides a
variety of powerful filters for adjusting signal
response with precision. A master on/off
button enables/disables the PEQ block.
10 individual filters are available for every PEQ
block, and each filter is capable of the following
types: Parametric, high-shelf and low-shelf
at 6dB/octave or 12dB/octave, all-pass,
variable-Q high-pass, variable-Q low-pass,
notch, and band-pass.
Select a filter number , then choose a filter
type, then adjust dragging its control node,
by using the slide-controls, or by entering
parameter values in the text boxes to the right
of each control.
PEQ Parameters :
Filter 1-10 : filter On/Off, active selection
Filter Types : Parametric: Symmetric boost/
cut, allowing individual adjustment of center
frequency, level and bandwidth.
• High-Shelf: Asymmetric boost or cut with
"shelving" shape. Allows adjustment of the
corner frequency and amplitude. Slope
can be selected as 6 dB/octave or 12 dB/
octave.
• Low-Shelf: Mirror-image of high-shelf.
• All Pass: Provides no change in amplitude,
but -180 degrees of phase shift at corner
frequency.
• Notch: Infinite cut at specified center
frequency, with adjustable bandwidth or Q.
• Variable Q HPF: Second order high pass filter
with adjustable Q.
• Variable Q LPF: Second order low pass filter
with adjustable Q.
• Band Pass: This will pass signals within the
filter's response region. It allows adjustment
of center frequency and bandwidth/Q. Gain
is 0 dB at the center frequency.
Frequency : Selected filter center/corner
frequency.
Level : Selected filter boost/cut amplitude.
Bandwidth : Selected filter bandwidth (or Q). .
Filter Type Details
Parametric EQ Filters
Parametric EQ uses peak filters with the ability
to control boost or cut, frequency center, and
bandwidth. Think of one band of parametric
EQ as a single graphic equalizer fader, except
that the frequency is variable, and that the
bandwidth, or how "wide" the filter affects the
frequency spectrum at the center frequency,
is also variable. The smaller the bandwidth,
the less the audio signal on either side of the
frequency center is boost or cut, whereas a
larger "wider" bandwidth produces an audible
change to the overall tone of a signal.
Parametric filters are best used to hunt down
and eliminate problem feedback frequencies,
add or remove a characteristic "hot spot" from
microphones, or clean up room resonance
situations. It is well worth the time becoming
proficient with parametric EQ filters, as they
offer the best solution to many EQ problems.
Parametric filters have a boost/cut range
of +15dB to -30dB. There is more cut than
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mXa-1502 • Operating Manual Ashly AquaControl™ Software