Parametric Equalizers
model PQ-16
model PQ-26
Five-Year Worry-
Free Warranty
PQ-16
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PQ-26
T
he Ashly PQ-16 and PQ-
26 Parametric Equalizers
offer complete equaliza
tion flexibility. Compared
to graphic equalizers that
preset center frequencies
and bandwidth, the Ashly
PQ-Series provides con
trol that can tune over a 5.5 octave
range, with variable bandwidth from
3.3 to 1/20 octave.
Some applications include: shaping
the overall response of a sound sys
tem to improve response, feedback
control, instrument tone control,
speaker or room resonance prob
lems, vocal and dialogue equaliza
tion, broadcast announcer voice
enhancement, special effects, or any
application where complete equaliza
tion control is necessary.
At the heart of the Ashly PQ-Series
is our unique bandpass filter circuit.
Basically a "state variable" type, this
filter is trimmed and optimized to pro
vide excellent transient response and
a wide range bandwidth adjustment.
Each filter can be tuned over a 50:1
frequency range (about 5.5 octaves)
and a 70:1 bandwidth range with no
more than a 2dB amplitude error at
center frequency. At its sharpest set
ting, the filter has a "Q" of about 35
and generates a response curve with
3dB points only 1/20 octave apart,
making feedback control possible
with no audible side effects.
Tunable low and high frequency
shelving filters are also provided to
trim frequency extremes. Each filter is
placed in the feedback loop of a sum
ming amplifier to produce the desired
frequency response. Since a sepa
rate summing amplifier is used for
each band, no interaction between
bands occurs. A hefty output stage is
provided so that low impedance loads
and long cable runs may be driven
with optimal results.
The single channel PQ-16 and the
stereo PQ-26 (also usable as 12-
band mono) Parametric Equalizers
are covered by Ashly's exclusive five-
year worry-free warranty.
Tunable Low and
High Frequency
Shelving Filters
Center Frequency
Tunable over a 5.6
Octave Range
Adjustable Bandwidth
from 3 1/3 to 1/20
of an Octave
Full 20dB Headroom
True Reciprocal Curves
Optional 12-Band Mono
Operation on PQ-26
Master and Individual
Band In/Out
Bypass Switching
(2 pages)
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