Ashly presents the PQX series parametric equalizers. Like
graphic equalizers, parametrics allow you to boost or cut selected
frequencies. However, parametric equalizers also allow exact adjustment of the
frequency and bandwidth of each band, resulting in very precise
control of frequency response. The amplitude, center frequency, and bandwidth
are the "parameters" for each equalizer band and the term
"Parametric" refers to the ability to adjust all of these
characteristics independently The Ashly PQX series equalizers are a third
generation design including many refinements on our original PQ models.
Lower noise, greater headroom, additional filters, full 20Hz -20KHz range
on all parametric filters and additional connector types are the
result. The heart of the PQX equalizers is a unique
bandpass filter circuit. Basically a "state-variable" type, this filter is
trimmed and optimized to provide excellent transient response and a
wide range of frequency and bandwidth adjustment. Each filter can
be tuned over a 100:1 frequency range (about 6.6 octaves)
and a 70:1 bandwidth range with no more than a
2 dB amplitude error at center frequency. At its sharpest
setting, the filter has a "Q" of about 35 and
generates a response curve with 3 dB points only 1/20
octave apart, making feedback control possible with no audible side
effects. Each filter is placed in the feedback loop of
a summing amplifier to produce the desired frequency response. Since
a separate summing amplifier is used for each band, no
interaction between bands occurs. After twenty years of refinement, the
Ashly parametrics are the most powerful equalization tool available. They
especially excel in control of resonance and feedback yet also
provide smoother broadband tone shaping than Graphic equalizers. Features: 5
Fully Parametric BandsParametric Filters Tunable from 20Hz - 20KHzTunable Low
and High Frequency Shelving Filters5 Year Worry-Free WarrantyVery Low Hum
and Noise DesignAdjustable Bandwidth from 3 1/3 to 1/20 of
an OctaveTrue Reciprocal Curves Master and Individual Band In/Out Bypass
SwitchingXLR, 1/4", and Barrier Strip Inputs
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