Ashly PQX571 Mono 7-Band Parametric EQ

The Ashly PQX Series equalizers are a third generation design including many refinements on the 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 parametric and 2 shelving bands per channel.

Wide range adjustment of all parameters for powerful control.

Very low noise and distortion.

Technical Info

Controls
Master Gain: +/-15dB
Master Defeat Switch: Yes
Per Band Amplitude: +/-15dB
Per Band Defeat Switch: Yes

Parametric Frequencies (5 Bands)
Range Switch Out: 200Hz-20kHz
Range Switch In: 20Hz-2kHz
Bandwidth: .05-3.3 Octaves

Shelving Frequencies (2 Bands)
Low: 40Hz-400Hz
High: 1.6kHz-16kHz

Input Impedance
20k Ohms, Active Balanced

Output Impedance
200 Ohms, Terminate with >600 Ohms

Max. Input Level
+22 dBu (+7 dBu at max boost, 1/3-octave or narrower)

Frequency Response
+/-.2dB 20Hz-20kHz

Total Harmonic Distortion (THD)
<.03%, +4dBu, 20Hz-20kHz

Hum and Noise
-90dBu (EQ in), -109dBu (EQ out)

Power Requirements
120VAC, 50-60Hz, 9W

Size (W x H x D)
19 x 1.75 x 6 in.

Shipping Weight
8 lbs.