Presonus Audio electronic DEQ 624 User Manual

DEQ 624

Digital Stereo Graphic Equalizer

Plus Dynamics Processing

User’s Manual

DEQ 624

DIGITAL STEREO EQUAL IZER

PLUS DYNAMICS PROCES SOR

USERS MANUAL

Version 1.0

? 2001, PreSonus Audio Electronics, Incorporated. All rights reserved.

W ARRANTY

PreSonus Limited Warranty

PreSonus Audio Electronics Inc. warrants this product to be free of defects in
material and workmanship for a period of one year from the date of original retail
purchase. This warranty is enforceable only by the original retail purchaser. To be
protected by this warranty, the purchaser must complete and return the enclosed
warranty card within 14 days of purchase. During the warranty period PreSonus
shall, at its sole and absolute option, repair or replace, free of charge, any product
that proves to be defective on inspection by PreSonus or its authorized service
representative. To obtain warranty service, the purchaser must first call or write
PreSonus at the address and telephone number printed below to obtain a Return
Authorization Number and instructions of where to return the unit for service. All
inquiries must be accompanied by a description of the problem. All authorized
returns must be sent to the PreSonus repair facility postage prepaid, insured and
properly packaged. PreSonus reserves the right to update any unit returned for
repair. PreSonus reserves the right to change or improve the design of the product
at any time without prior notice. This warranty does not cover claims for damage
due to abuse, neglect, alteration or attempted repair by unauthorized personnel, and
is limited to failures arising during normal use that are due to defects in material or
workmanship in the product. Any implied warranties, including implied warranties
of merchantability and fitness for a particular purpose, are limited in duration to the
length of this limited warranty. Some states do not allow limitations on how long
an implied warranty lasts, so the above limitation may not apply to you. In no event
will PreSonus be liable for incidental, consequential or other damages resulting
from the breach of any express or implied warranty, including, among other things,
damage to property, damage based on inconvenience or on loss of use of the
product, and, to the extent permitted by law, damages for personal injury. Some
states do not allow the exclusion of limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. This warranty
gives you specific legal rights, and you may also have other rights, which vary form
state to state. This warranty only applies to products sold and used in the United
States of America.

Limited Warranty Outside of The U.S.

PreSonus Audio Electronics products are warranted only in the country where purchased,
through the authorized PreSonus distributor in that country, against defects in material and
workmanship. The specific period of this limited warranty shall be that which is described to
the original retail purchaser by the authorized PreSonus dealer or distributor at the time of
purchase. PreSonus does not, however, warrant its products against any and all defects: 1)
arising Out of materials or workmanship not provided or furnished by PreSonus, or 2)
resulting from abnormal use of the product or use in violation of instructions, or 3) in
products repaired or serviced by other than authorized PreSonus repair facilities, or 4) in
products with removed or defaced serial numbers, or 5) in components or parts or products
expressly warranted by another manufacturer. PreSonus agrees, through the applicable
authorized distributor, to repair or replace defects covered by this limited warranty with
parts or products of original or improved design, at its option in each respect, if the defective
product is shipped prior to the end of the warranty period to the designated authorized
PreSonus warranty repair facility in the country where purchased, or to the PreSonus factory
in the U.S., in the original packaging or a replacement supplied by PreSonus, with all
transportation cost and full insurance paid each way by the purchaser or owner. All remedies
and the measure of damages are limited to the above services. It is possible that economic
loss or injury to person or property may result from the failure of the product; However, even
if PreSonus has been advised of this possibility, this limited warranty does not cover any
such consequential or incidental damages. Some states or countries do not allow the
limitations or exclusion of incidental or consequential damages, so the above limitation may
not apply to you. Any and all warranties, express or implied, arising by law, course of
dealing, course of performance, usage of trade, or otherwise, including but not limited to
implied warranties of merchantability and fitness for a particular purpose, are limited to a
period of two years from either the date of original retail purchase or, in the event no proof
of purchase date is available, the date of manufacture. Some states or countries do not allow
limitations on how long an implied warranty last, so the above limitations may not apply to
you. This limited warranty gives you specific legal rights, and you may also have other rights
which vary from state to state, country to country.

PreSonus Audio Electronics, Inc.
7257 Florida St.
Baton Rouge, LA 70806
[phone]

? 2001, PreSonus Audio Electronics, Incorporated. All rights reserved.

TABLE OF CONTENTS

1 Overview

1.1 Introduction 5

1.2 Features 6

2 Controls & Connections

2.1 Front Panel Basic Layout 8

2.2 Operation

Dynamics / Master Controls 9

Meters 9
Filters 10
Expander 11
Limiter 11
Gain 12
Bypass 12
Range 12
HI Q 13
Enabling/Disabling HI Q 14
Channel A Master 15
AHC 16
Presets 16
Storing/Recalling Presets 17
Security 18

Locking/Unlocking Front Panel 18
Graphic Equalizer 19
Back Panel Basic Layout 19
Power Supply 20

3 Technical

Specifications 21

4

OVERVIEW

1.1 INTRODUCTION

Thank you for purchasing the PreSonus DEQ 624 Digital Stereo Graphic Equalizer plus
Dynamics Processor. This Digital Graphic Equalizer has been designed using advanced
technology and state of the art components to deliver crystal clear audio for an infinite period
of time. We believe the DEQ 624 to be an exceptional product and an exceptional value. Feel
free to contact us at 1-800-750-0323. We value your suggestions and your comments.
PreSonus Audio Electronics is committed to constant product improvement. The best way for
us to be successful in this endeavor is by listening to the experts on our gear, our valued
customers. We appreciate the support you have shown us through the purchase of this
product.

Please pay close attention to how you connect your DEQ 624 to your system. Improper
grounding is the most common cause of noise problems found in studio or live sound systems.
We suggest that you scan this manual before hooking up your unit to familiarize yourself with
its features and functions.

Good luck and enjoy your DEQ 624!

5

OVERVIEW

1.2 FEATURES

The following is a summary of your DEQ 624’s features:

? 24-Bit Digital Signal Processing. The DEQ 624 utilizes 24-Bit resolution for accurate

processing of analog signals.

? Dual 31 Band Equalizers. Each channel of the Graphic Equalizer section of the DEQ 624 is

comprised of 31 digital EQ encoders. These digital EQ encoders are centered in 1/3rd octave
increments from 20 Hz to 20 kHz.

? Separate High Pass & Low Pass Filters for each channel. Each channel of the DEQ 624 is

provided separate High and Low Pass filters. The Low Pass Filter is variable from 10 kHz to 20
kHz. The High Pass Filter is variable from 10 Hz to 410 Hz.

? Expander. Both channels have separate Expanders with Ratio and Threshold controls for

minimizing system noise.

? Limiter. Each channel of the DEQ 624 is equipped with a “Brick-wall” limiter (Ratio=Inf: 1)

with a Threshold control to provide protection from extreme transients. This feature is designed to
protect the system components and the listener.

? HI Q. Selecting HI Q alters the characteristics of the equalization of the DEQ 624. The center

frequency remains fixed for both Normal Q and HI Q; however, in HI Q the effect on adjacent
frequencies is less pronounced. Normal Q is 1/3rd octave bandwidth (Q=4.32) and Hi Q is1/8th
octave bandwidth (Hi Q=11.54)

? Range. The degree of control of the digital encoders in the DEQ 624 Graphic Equalizer section

can be altered by engaging the Range control switch located in the Dynamics/Master control
section. A choice of +? / ?? dB? ??? ? ??? dB? and ??? ? ??? dB can be chosen by pressing the
Range switch. The selected Range is indicated by LED’s located at the extreme left side of the
Graphic Equalizer section. Changing the Range selection for a channel changes the range for all
EQ encoders on a channel.

? Bypass. Engaging the Bypass switch routes the signal from input to output by way of a hard-wire

bypass (On-board metering continues to monitor processed signal; not bypassed signal).

? 4 User-Programmable Presets. Four user-determined setups can be stored in the DEQ 624.

This is accomplished by storing a “snapshot” of the settings of the various controls of the front
panel of the unit into one of the four preset positions provided for this purpose. A Store switch

6