Ashly PQX-571 Operating Manual - Page 3

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Operating Manual - PQX 571 and PQX 572 Parametric Equalizer

INTRODUCTION

Congratulations on your purchase of an Ashly

PQX series parametric equalizer. Like graphic equaliz-

ers, parametric equalizers allow you to boost or cut se-

lected frequencies. Unlike graphic equalizers however,

parametric equalizers can tune in the exact frequencies

you want and control the bandwidth of each selected fre-

quency band, resulting in very precise control of frequency

response.

The Ashly PQX series equalizers are a third gen-

eration design including many refinements on our origi-

nal PQ models. Lower noise, greater headroom, addi-

tional filters, full 20Hz -20KHz range on all parametric

filters and additional connector types are the result. The

parametric filters are still based on the "state variable"

type circuit, and a separate summing amplifier is used

for each filter so that no interaction between bands oc-

curs.

UNPACKING

As a part of our system of quality control, every

Ashly product is carefully inspected before leaving the

factory to ensure flawless appearance. After unpacking,

please inspect for any physical damage. Save the ship-

ping carton and all packing materials , as they were care-

fully designed to reduce to minimum the possibility of

transportation damage should the unit again require pack-

ing and shipping. In the event that damage has occurred,

immediately notify your dealer so that a written claim to

cover the damages can be initiated.

The right to any claim against a public carrier

can be forfeited if the carrier is not notified promptly and

if the shipping carton and packing materials are not avail-

able for inspection by the carrier. Save all packing mate-

rials until the claim has been settled.

AC POWER

Your PQX equalizer should be connected to a

standard 3-wire grounded electrical outlet supplying 120

Volts, 50-60 Hz (some export models are wired for 240

Volts, and are labeled as such). To reduce the risk of

ground loop hum, connect all audio equipment to the same

electrical power source. Removal of the ground pin is

both unlawful and dangerous, as a potential shock hazard

could result.

This unit will perform normally within an AC

voltage range of 94 to 130 volts. Voltages less than this,

as found in "brown-out" conditions, will reduce headroom

and decrease power supply regulation. While this may

affect performance, the equalizer will continue to func-

tion during a brown-out. This unit has an internal line

fuse. In the unlikely event that the fuse should blow,

refer the product to a qualified technician for servicing.

Overall power consumption is less than 15 watts.

AUDIO CONNECTORS AND CABLES

4.1

Balanced

Ashly uses electronically balanced inputs on all

equalizers. The inputs and outputs can be used balanced

or unbalanced. Your PQX series equalizer is provided

with three different connector types. 1/4 inch stereo phone

jacks, three pin XLR type connectors, and a terminal strip

will allow interfacing to most professional audio prod-

ucts. The (+) signal is on the tip of the phone plug and

pin 2 of the XLR connector. The (-) signal is on the ring

of the phone plug and pin three of the XLR. To achieve

best performance, we recommend using balanced connec-

tions between all components in your system, as this re-

duces ground-loop induced hum and common-modenoise.

4.2

Unbalanced

If either inputs or outputs are used unbalanced,

the signal is on the (+) connection and the (-) connection

must be tied to ground. A mono phone plug used as an

unbalanced connection will automatically ground the ring

of the jack which is the (-) connection. When using a

stereo plug, XLR connector, or the terminal strip for un-

balanced input or output connections, the signal (-) MUST

be tied to the sleeve, or a significant loss of signal level

may result.