DEQ 624 Digital Stereo Graphic Equalizer Plus Dynamics Processing User’s Manual
DEQ 624 D I G I T A L P L U S S T E R E O D Y N A M I C S E Q U A L I Z E R P R O C E S S O R USERS MANUAL Version 1.0 ? 2001, PreSonus Audio Electronics, Incorporated. All rights reserved.
W A R R A N T Y 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.
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.
TABLE OF CONTENTS 1 Overview 1.1 Introduction 1.2 Features 2 5 6 Controls & Connections 2.1 Front Panel Basic Layout 2.
OVERVIEW 1 . 1 I N T R O D U C T I O N 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.
OVERVIEW 1 . 2 F E A T U R E S The following is a summary of your DEQ 624’s features: ? 24-Bit Digital Signal Processing. 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.
OVERVIEW and a Preset switch can be found in the Dynamics / Master control section to activate this feature. Pressing the Preset switch cycles through the Four Presets and the Manual position. ? Front Panel Security Lock-Out. The security lock-out feature allows the operator of the DEQ 624 to defeat the front panel controls of the unit when in Preset mode. Inadvertent or intentional alteration of the unit’s controls will have no effect on the Preset governing the signal being processed.
CONTROLS & CONNECTIO NS 2.1 FRONT PANEL BASIC LAYOUT The front panel of the DEQ 624 is divided into two sections: Dual 31 Band Graphic Equalizers Dynamics / Master Control The Dynamics / Master control section of the DEQ 624 occupies the right side of the front panel and contains the Limiter, Expander, Filters, Gain control, HI Q switch, Range switch, Bypass, Channel Master A, AHC, Program LED’s, Preset switch, Store / Security switch, Output Level Meter and, Gain Reduction Meter for both channels.
CONTROLS & CONNECTIO NS Dynamics/Master Control Output Level Meter The output of each channel of the DEQ 624 can be monitored by way of dual twenty segment LED meters contained in the Dynamics / Master section. These meters display the output of channels A and B, respectively, from – 42dBu to +22dBu . A peak hold function has been incorporated into the output meters to facilitate monitoring extremely fast transients. The peak hold lasts for approximately 3 seconds.
CONTROLS & CONNECTIO NS Gain Reduction Meter The Gain Reduction Meters of the DEQ 624 monitor the activity of both the Expander and Limiter. These 10 segment LED meters are calibrated in increments from ? ? ?? dB to ? ? ? dB and show the amount of Gain Reduction applied by the dynamics processors. The Gain Reduction meter continues measuring processor activity in Bypass mode. Filter – High Pass / Low Pass HIGH PASS FILTER The High Pass filter control is variable from 10 Hz to 410 Hz.
CONTROLS & CONNECTIO NS selecting 20 kHz allows all frequencies from 20 kHz and below to pass through unaffected, effectively turning the Low Pass filter “Off”. Expander The DEQ 624 Expander is provided to eliminate system noise. The Expander is controlled by selecting a threshold point for downward expansion to begin and by selecting a ratio, which controls the amount of downward expansion. THRESHOLD The Expander Threshold control is variable from ? ? ? dB to Off .
CONTROLS & CONNECTIO NS THRESHOLD The Threshold control for the Limiter is calibrated from ? dBu to Off. Gain A Gain control on each channel of the DEQ 624 is the last controller in the signal path and is used to compensate for signal level loss from dynamics processing. The control is centered at ? and with a Cut / Boost capability from ? ? ? dBu to ? ? ? dBu. Bypass A Bypass switch on each channel redirects signal to a hard-wire bypass connection that takes the DEQ 624 circuitry out of the signal path.
CONTROLS & CONNECTIO NS desired, it is probable that any EQ encoder choices made before the alteration in range will require resetting. Range selection for each channel is global and is applied to all channel EQ encoders. HI Q Normal Q (Q? ? ?? ? ? of the DEQ 624 is divided into bandwidths of 1/3rd octave from 20 Hz to 20 kHz. HI Q (Q? ? ? ?? ? ? resets the bandwidth to 1/8th octave. The center frequencies remain unchanged while the effect on adjacent frequencies is less pronounced in HI Q.
CONTROLS & CONNECTIO NS The following example illustrates enabling and disabling HI Q for the 1kHz EQ encoder for Channel A. EXAMPLE Enabling HI Q for 1 kHz (Channel A) (HI Q is not enabled for any of Channel A’s EQ encoders at the start of the sequence). 1. Press the Channel A HI Q switch. The Channel A switch lights up and none of the HI Q Active LED’s in the Graphic Equalizer section are lit. 2. Move the Channel A 1 kHz EQ encoder quickly.
CONTROLS & CONNECTIO NS Security switch light to go OFF. HI Q has now been de-selected for the Channel A 1 kHz EQ encoder. 4. Pressing the Channel A HI Q switch results in the Hi Q switch light going OFF and the unit to exit HI Q set-up mode. EQ encoders are updated when HI Q mode is selected. The effects of Boost / Cut are audible during this process. During HI Q mode, any EQ encoder may be toggled ON/OFF by repeating steps 2 and 3 of the preceding examples.
CONTROLS & CONNECTIO NS Channel B Channel B of the DEQ 624 is a duplicate of Channel A. All controls, encoders and LED indicators found on Channel A are found on Channel B. REMEMBER: When Channel Master A is engaged, all of Channel B’s controls are disabled! Adaptive Hum Cancellation (AHC) Adaptive Hum Cancellation has been incorporated into the DEQ 624 for the express purpose of reducing 50 Hz or 60 Hz line noise.
CONTROLS & CONNECTIO NS ON position). Press and release the Store / Security switch. Notice that the Store / Security switch and the Program 1 LED are blinking rapidly. You can cycle through all 4 Program positions and back to Manual mode by simply pressing and releasing the Store / Security switch. Go through set-up of the DEQ 624 to suit your requirements. After you have finished, be sure that Channel A HI Q, Channel B HI Q and Preset are not engaged.
CONTROLS & CONNECTIO NS LOCKING THE DEQ 624 To lock the DEQ 624, make sure the unit is in Preset mode. Now, while holding down the Store / Security switch; push any three switches in the Dynamics / Master control section. You can choose to push the same switch three times, one switch twice and one other switch or three separate switches. Any combination of three switches while holding the Store / Security switch locks the front panel.
CONTROLS & CONNECTIO NS ? 31 Digital Encoders per channel ? ? ?? 6 dB (Red), ? ?? 12 dB (Amber), ? 12?? 24 dB (Green) RANGE LED Indicators per channel ? 31 HI-Q Active LED indicators 2.4 BACK PANEL BASIC LAYOUT Both channels of the DEQ 624 XLR inputs and outputs, ¼” TRS inputs and outputs and a Barrier Strip with inputs and outputs for versatile system connectivity.
CONTROLS & CONNECTIO NS 2.7 POWER SUPPLY The Power Supply for your DEQ 624 has been Factory Configured to use the voltage of the electrical current for the country of retail sale (USA = 115V). WARNING: Attempting to operate this unit at voltages for which this power supply was not designed will void the manufacturer’s warranty and may result in damage to the unit and injury or even death to the operator.
4 TECHNICAL DEQ 624 Technical Specifications: Number of Channels Dynamic Range Noise Floor Signal to Noise Power Supply Rejection Headroom Frequency Response +/- 0.5dB Channel Gain THD + Noise (Un-weighted) Two >105dB -95dBu ? 90dB ? 98dB +22dBu 10Hz to 22kHz ? 20dB to +20dB 0.
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