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DX8 Digital Mixer and Signal Processor
INSTRUCTION MANUAL
DX 8
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DX8 DIGITAL MIXER
1
2
3
4
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7
8
LO
EQ
HI
A
MASTER
B
A B LOCK
MODE
COMM PORT
POWER
2345678
SERIAL NUMBER
MANUFACTURING DATE
DX8 DIGITAL MIXER
DIRECT OUTPUTS
U
U
U
U
U
U
U
U
U
U
12
INPUTS
1 +5V
G + –
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-20
+20
-20
+20
-30dB +30dB
TRIM
BUS A
TRIM
BUS B
TRIM
1
TRIM
2
TRIM
3
TRIM
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TRIM
5
TRIM
6
TRIM
7
TRIM
8
G
11
OUTPUTS
1
REMOTE BUS
COMM PORT
MIC
MIC
MIC
MIC
MIC
MIC
MIC
MIC
LOGIC I/O
POWER
INPUT
22-28V DC,
3A MAX
– + G
G + –
OUTPUTS
PHANTOM POWER
48V DC
G + –
G + –
A
B
A
B
–
+
100 – 240V , 50/60Hz, 1A MAX
LISTED COMMERCIAL
AUDIO EQUIPMENT
9Z39
ON
12345678
RECORD
LINE
LINE
LINE
LINE
LINE
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LINE
LINE
LINE
LINE
R
8x2 Digital Mixer and Signal Processor
2
1
MIC
LINE
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CAUTION AVIS
RISK OF ELECTRIC SHOCK • DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
WARNING — To reduce the risk of fire or
electric shock, do not expose this appliance to
rain or moisture.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
ATTENTION: POUR EVITER LES RISQUES DE CHOC
ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE. AUCUN
ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER
L'ENTRETIEN AU PERSONNEL QUALIFIE.
AVIS: POUR EVITER LES RISQUES D'INCENDIE OU
D'ELECTROCUTION, N'EXPOSEZ PAS CET ARTICLE
A LA PLUIE OU A L'HUMIDITE
CAUTION — Internal lithium battery. Danger
of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
1. SAFETY INSTRUCTIONS
The lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user to the presence of uninsulated "dangerous voltage"
within the product's enclosure, that may be of sufficient magnitude to constitute
a risk of electric shock to persons.
Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral est
utilisé pour alerter l'utilisateur de la présence à l'intérieur du coffret de "voltage
dangereux" non isolé d'ampleur suffisante pour constituer un risque d'éléctrocution.
The exclamation point within an equilateral triangle is intended to alert the user
of the presence of important operating and maintenance (servicing) instructions
in the literature accompanying the appliance.
Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé pour
alerter les utilisateurs de la présence d'instructions importantes pour le fonction-
nement et l'entretien (service) dans le livret d'instruction accompagnant l'appareil.
1. Read Instructions — Read all the safety and operation instructions before
operating the DX8.
2. Retain Instructions — The safety and operating instructions should be
kept for future reference.
3. HEED ALL WARNINGS — Follow all warnings on the DX8 and in these
operating instructions.
4. FOLLOW ALL INSTRUCTIONS — Follow all operating and other
instructions.
5. Water and Moisture — Do not use the DX8 near water – for example,
near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement,
near a swimming pool, etc.
6. Ventilation — This DX8 should be situated so that its location or position
does not interfere with its proper ventilation. For example, it should not be
situated on a bed, sofa, rug, or similar surface that may block any
ventilation openings, or placed in a built-in installation such as a bookcase
or cabinet that may impede the flow of air through ventilation openings.
7. Heat — Locate the DX8 away from heat sources such as radiators, or
other devices which produce heat.
8. Power Sources — Connect the DX8 to a power supply only of the type
described in these operation instructions or as marked on the rear panel. If
using an external DC power supply or battery pack, be sure the voltage
corresponds to the range indicated on the rear panel, and that it is
connected with the correct polarity.
9. Power Cord Protection — Route power supply cords so that they are not
likely to be walked upon or pinched by items placed upon or against them,
paying particular attention to cords at plugs, convenience receptacles, and
the point where they exit the DX8.
10. Object and Liquid Entry — Do not drop objects into or spill liquids into the
inside of the DX8.
11. Damage Requiring Service — The DX8 should be serviced only by
qualified service personnel when:
A. The power-supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has spilled into the DX8; or
C. The DX8 has been exposed to rain; or
D. The DX8 does not appear to operate normally or exhibits a marked
change in performance; or
E. The DX8 has been dropped, or its chassis damaged.
12. Servicing — The user should not attempt to service the DX8 beyond those
means described in this operating manual. All other servicing should be
referred to the EAW COMMERCIAL Service Department.
13. To prevent electric shock, do not use this polarized plug with an extension
cord, receptacle or other outlet unless the blades can be fully inserted to
prevent blade exposure.
Pour préevenir les chocs électriques ne pas utiliser cette fiche polariseé
avec un prolongateur, un prise de courant ou une autre sortie de courant,
sauf si les lames peuvent être insérées à fond sans laisser aucune pariie à
découvert.
14. Grounding or Polarization — Precautions should be taken so that the
grounding or polarization means of the DX8 is not defeated.
15. This apparatus does not exceed the Class A/Class B (whichever is
applicable) limits for radio noise emissions from digital apparatus as set
out in the radio interference regulations of the Canadian Department of
Communications.
ATTENTION —Le présent appareil numérique n’émet pas de bruits
radioélectriques dépassant las limites applicables aux appareils
numériques de class A/de class B (selon le cas) prescrites dans le
règlement sur le brouillage radioélectrique édicté par les ministere des
communications du Canada.
TABLE OF CONTENTS
KEY FEATURES ......................................................................... 3
FRONT PANEL FEATURES ........................................................ 4
REAR PANEL FEATURES ........................................................... 5
SIGNAL-FLOW DIAGRAM ........................................................ 6
APPLICATION DIAGRAMS ....................................................... 7
CONNECTIONS ...................................................................... 12
AC POWER CONSIDERATIONS .............................................. 13
QUICK START ......................................................................... 14
USING INPUTS 1-8 ................................................................. 15
USING THE BUS A and B INPUTS .......................................... 15
DIRECT OUTPUTS ................................................................... 16
OUTPUTS A and B .................................................................. 16
USING THE RECORD OUTPUT ................................................ 16
USING THE REMOTE BUS CONNECTION .............................. 16
USING THE LOGIC I/O ............................................................ 16
FRONT PANEL LOCK ............................................................... 18
INSTALLING THE SOFTWARE ................................................ 18
UPGRADING THE SOFTWARE ................................................ 18
CONNECTING A PC ................................................................ 18
UPGRADING THE FIRMWARE ................................................ 18
OVERVIEW ............................................................................. 19
MENU BAR ............................................................................. 19
INDICATORS AND PRESETS .................................................. 21
BUTTONS ............................................................................... 23
CHANNEL STRIP .................................................................... 28
OUTPUT STRIP ....................................................................... 29
BLOCK DIAGRAM ................................................................... 30
DX8 SPECIFICATIONS ............................................................. 31
APPENDIX B: Logic Output Functions ............................................... 34
APPENDIX D: Level Remote Predefined Functions ........................... 35
2 – DX8
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2. INTRODUCTION
The DX8 is a DSP-based digital audio mixer and
signal processor designed for use in a variety of
installations such as churches, courtrooms,
convention centers, and hotels. It provides eight
universal inputs and two balanced outputs allowing
true 8x2 mixing for stereo or dual-zone applications.
The DX8 includes powerful signal processing
software to complement the 8x2 mixing structure.
Automixing capability allows the DX8 to be setup
for applications where a human operator is not
available.
Each of the eight input channels is terminated to
two Phoenix-type detachable connectors. Each
connector is optimized to accept either microphone
or line-level signals. Microphone preamplifiers
employ XDR™ technology to offer studio-class
audio performance. Phantom power of 48 VDC is
switchable individually on each input. Two auxiliary
line-level inputs with trim are provided, allowing
analog signals to be mixed with the A and B master
mixes. Master outputs deliver balanced line-level
signals to detachable Phoenix-type connectors as
well as buffered unbalanced signals to RCA
connectors intended for recording.
The DX8 offers an intuitive front panel user
interface, consisting of dual-function LED bar graph
meters for each input and output. Input meters
indicate the presence of signal before signal pro-
cessing (pre-fader), while output meters indicate
actual level at the output (post-fader). Levels are set
by means of UP/DOWN pushbuttons dedicated to
each input and output. A MODE button is used to
select between Mix A and B, allowing adjustment
of levels to both mix outputs from the same set of
input controls. A third function of the MODE button
allows the user to LOCK the front panel controls
until a security unlock code is entered.
The DX8 offers flexible interface options through
dedicated inputs and outputs for control and
programming purposes. Two independent RS232
connectors are provided, one on the front panel and
one on the rear, for connection to a computer or
control system. A multi-pin (DB25F) connector on
the rear panel allows interface among the 10 Logic
Inputs and 10 Logic Outputs. This interface
connects to switches, LEDs, and other devices,
enabling hardware control and indication from
custom control panels. All logic inputs and outputs
are fully programmable in software. A proprietary
remote control bus allows connection of the
optional wired remotes over three-conductor cable.
Remotes are available in Volume Control (DX-RVC)
and 4-Switch (DX-SW4) versions and may be
combined in any configuration.
The DX8 is supplied with PC software that
allows access to all of the system’s settings and
configurations. The software offers access to the
Automixing controls, two 1/3-octave equalizers, two
5-band parametric equalizers, and two compressors
dedicated to the two master outputs. In addition, it
allows configuration and recall of up to 16 Presets, 8
input Priority Levels, 8 Mute Groups, and 8 Control
Groups. Force ON and OFF functions are provided,
with a selection of Relative or Absolute changes,
which can be used with the Priority settings to
create sophisticated audio management systems.
All settings and text labels are retained in the DX8,
and can be saved on the computer’s local drive.
The DX8 is UL and CE approved and designed
for continuous use in professional fixed installation
systems. An internal auto-ranging power supply
allows connection to mains voltages from 90-240V AC
at 50/60 Hz without requiring jumper or switch
setting changes. A 24 VDC input is provided for
applications where backup power is required.
Switchover to backup power is automatic and silent.
KEY FEATURES
• 32-bit DSP and 24-bit Analog/Digital Conversion
• 8 balanced XDR™ Mic/Line inputs with trim
• 2 balanced Line inputs direct to mix buses A and B
• 2 Independent Mix Buses and balanced Outputs
• 2 unbalanced Record Outputs
• 8 unbalanced Direct Channel Outputs
• Individual Level/Peak (PPM) metering on each Input
and Output
• 3-band sweepable Hi/Lo shelving and mid-peaking
EQ
on each Input
• 2-band sweepable shelving EQ on each Output
• 31-band Graphic EQ on each Output
• 5-band Parametric EQ on each Output
• One fully variable Compressor on each Output
• Independent Automixing function for each Output
to maximize acoustic gain and prevent feedback
• 10 Programmable Logic Inputs
• 10 Programmable Logic Outputs
• 2 independent RS-232 interface ports
• 48 VDC Phantom Power switch per input
• 24 VDC Backup Power input
• Hardware Expansion Port accepts optional
modules
• PC Software application included
Part No. SW0094 Rev. A 01/04
© 2004 LOUD Technologies Inc. All Rights Reserved.
DX8 – 3
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FRONT PANEL FEATURES
INPUT UP/DOWN BUTTONS
Use these buttons to adjust the mix level for each
input channel.
EQ LED DISPLAY
When an EQ UP/DOWN button is pressed, the EQ
meter indicates the amount of boost or cut of the
LO and HI frequencies in decibels (
±
15 dB).
INPUT LED DISPLAY
This indicates the signal level after the mic preamp
stage, just after the A/D converter, but prior to any
digital signal processing. When any input UP/
DOWN button is pressed, all the meters (except
EQ) switch from level metering to level setting
indication. After five seconds, the meters switch
back to normal peak program metering (PPM).
When both "0" LEDs are lit, the gain is set to unity
(flat response).
Note: The EQ meters do not indicate signal level.
MASTER A/B UP/DOWN BUTTONS
These buttons adjust the output level for each
output bus.
When the 10 and 7 LEDs are both lit, the gain is set
to unity (0 dB).
MASTER OUTPUT LED DISPLAY
This indicates the signal level after the digital signal
processing and MASTER gain stage, just prior to
the D/A converter. When any MASTER UP/DOWN
button is pressed, all the meters (except EQ) switch
from level metering to level setting indication. After
five seconds, the meters switch back to normal
peak program metering (PPM).
EQ LO/HI UP/DOWN BUTTONS
Use these buttons to adjust the gain of the 2-band
shelving EQ on the outputs. The range is
±
15 dB.
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LO
EQ
HI
A
MASTE
1
2345678
SERIAL NUMBER
MANUFACTURING DATE
DX8 DIGITAL MIXER
DIRECT OUTPUTS
U
U
U
U
U
U
U
U
U
U
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-30dB +30dB
0 60
-20
+20
-20
+20
-30dB +30dB
TRIM
BUS A
TRIM
BUS B
TRIM
1
TRIM
2
TRIM
3
TRIM
4
TRIM
5
TRIM
6
TRIM
7
TRIM
8
MIC
MIC
MIC
MIC
MIC
MIC
MIC
MIC
POWER
INPUT
22-28V DC,
3A MAX
– + G
G + –
MIC
LINE
100 – 240V , 50/60Hz, 1A MAX
LISTED COMMERCIAL
AUDIO EQUIPMENT
9Z39
–
+
LINE
LINE
LINE
LINE
LINE
LINE
LINE
LINE
LINE
LINE
R
4 – DX8
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MODE
This switch changes the front panel operation
between Bus A and Bus B operation. In addition,
the LOCK position disables the front panel controls
to prevent unauthorized changes to the settings. A
security code must be entered to enable the front
panel controls when the DX8 is locked. See page 17
for more information on locking and unlocking the DX8.
REAR PANEL FEATURES
INPUTS 1-8
Each of the eight analog inputs has separate
balanced mic and line input connectors that use
acclaimed XDR mic preamps. These are 3-pin
Phoenix-type connectors. Use either the MIC or
LINE input, but only one can be used per channel.
COMM PORT
This is an RS-232 port on a 9-pin D-Sub connector,
which connects to a personal computer or other
compatible control system for external control of
the DX8 settings. A second COMM port on the rear
panel duplicates this function, for permanent
connection to an installed controller.
TRIM
This rotary analog control is used to trim the gain of
the input signal for optimum signal-to-noise ratio in
the preamp stage. For mic-level signals, it provides
from 0 to +60 dB of gain. For line-level signals, it
provides from –30 dB to +30 dB of gain, with unity
(0 dB) at the center position. This control accepts a
maximum input signal of +18 dBu before clipping
(at unity gain).
POWER
Use the POWER switch to turn the DX8 on and off.
PHANTOM POWER
These switches apply phantom power (+48 VDC) to
pins 2 and 3 of the selected mic input connectors.
Switch the PHANTOM POWER switch in the UP
position for an individual channel when using a
condenser microphone.
OL
BUS A/B INPUTS
These analog inputs accept balanced line-
level signals and route the signal to the
internal buses. These inputs may serve as
additional zone inputs for program devices,
or to connect the BUS A and BUS B
outputs from another DX8. There is no DSP
processing on these inputs.
2
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DX8 DIGITAL MIXER
A
MASTER
B
A B LOCK
MODE
BUS A and B TRIM
These rotary analog controls are used to
trim the gain of the inputs to the buses.
This trim control provides from –20 dB to
+20 dB of gain, with unity (0 dB) at the
center-detent position.
COMM PORT
POWER
TURING DATE
DIRECT OUTPUTS
This 15-pin D-Sub connector supplies an
analog, unbalanced line-level signal from
each of the eight program inputs, post-
preamp and pre-processing. Use these
outputs to connect to another mixing
console for additional zone coverage, to a
telephone system for music-on-hold, or to
a multi-track recorder. See page 12 for the
Direct Output pinouts.
U
12
INPUTS
1 +5V
G + –
0
0dB
0 60
-30dB +30dB
TRIM
8
G
11
OUTPUTS
1
MIC
LOGIC I/O
REMOTE BUS
COMM PORT
PHANTOM POWER
48V DC
OUTPUTS
G + –
G + –
A
B
A
B
ON
12345678
LINE
RECORD
DX8 – 5
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