LEM DX 24 User manual

The lighting flash with arrowshad symbol within an
equilateral triangle is intended to alert the user to the
presence of uninsulated “dangerous voltages” within the
product’s enclosure, that may be of sufficient magnitude to
constitute a risk of electric schok to persons.
The exclamation point within an equilater triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanyng the appliance.
IMPORTANT SAFETY INSTRUCTIONS
INSTRUCTIONS PERTAINING A RISK OF FIRE, ELECTRIC SHOCK OR INJURY A PERSONS
WARNING - When using electric products, basic precautions should always be followed, including the fol-
lowing.
1. Read all the SAFETY INSTRUCTIONS before using the product.
2. A reduce the risk of injury, close supervision is necessary when the product is used near children.
3. Do not use this product near water - for example, near a bathtub, washbowl, kitchen sink, in a wet base-
ment or near a swimming pool or the like.
4. This product in combination with an amplifier, may be capable of producing sound levels that could cause
permanent hearing loss. Do not operate for a long period of time at high volume level or at level that is
uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an audiologist.
5. This product should be located so that its location or position does not interfere with its proper ventilation.
6. This product should be located away from heat sources such as radiators, heat register or other product
that produce heat.
/. The product may be connected a power supply only of the type described on the operating instructions or
as marked on the product.
8. The product may be equipped with a polarized line plug (one blade wider then the other). This is a safety
feature. If you are unable a insert the plug into the outlet, contact an electrician a replace your obsolete
outlet. Do not defeat the safety purpose of the plug.
9. The power-supply cord of the product should be unplugged from the outlet when left unused for a long
period of time. When unplugging the power-supply cord, do not pull on the cord, but grasp it by the plug.
10. Care should be taken so that object do not fall and liquid are not spilled into the enclosure through
openings.
11. The product should be serviced by qualified service personnel when:
A. The power-supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the product; or
C. The product has been exposed to rain; or
D. The product does not appear to operate normally or exhibits a marked change in performance; or
E. The product has been dropped or the enclosure damaged.
12. Do not attempt to service the product beyond that described in the user-maintenance instructions.
All other servicing should be referred to qualified service personnel.
13. WARNING - Do not place objects on the product’s power cord or place it in a position where anyone
could trip over, walk on or roll anything over it. Do not allow the product to rest on or to be installed over
power cords of any type. Improper installations os this type create the possibility of fire hazard and/or per-
sonal injury.
SAVE THESE INSTRUCTIONS

1
Contents
Warnings and Installation. . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Signal Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
The Basic Principles of Navigation and Editing . . . . . . . . . . . . . 10
Configuration of the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Adjusting the input signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
First Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Display information in default conditions . . . . . . . . . . . . . . . . . . 14
System configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Number of PRESETS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Type of PRESET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Name of the PRESET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PRESET Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Menu map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Menu map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Variations of the Audio Parameter editing pages. . . . . . . . . . . . 19
PRESET menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Load PRESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Store & Naming PRESET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Dump Out PRESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Incoming Dump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Contents

2
DELAY Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
The practical differences between Input and Output Delay . . . . . . . . 25
Input Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Output Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
EDIT menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input EQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Type of filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Centre Frequency / Cutoff Frequency. . . . . . . . . . . . . . . . . . . . . . . . 30
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Xover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Low Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
High Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Type of filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Crossover frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Output EQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Output Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Output Pol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Output Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Reaction times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Threshold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
UTILITY Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Ganging submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input Ganging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Output Ganging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Units submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Delay Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Lim. Thresh. Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Temperature Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Contents

3
Contents
Misc. Setup submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Output Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Wake Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
LCD Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Lock submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
How to enable protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Protection mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
How to disable the protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
MID setup submenu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Program Change IN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Program Change OUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Factory PRESETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . 56

4
Warnings and Installation
✔ ✔
✔ ✔
✔
Connection to the mains supply
The unit has its own built-in power supply. Before switching on the unit, make certain that the mains voltage
matches that shown on the rear (a tolerance of up to ±10% is acceptable). Before connecting or disconnect-
ing the power cord, make certain the ON/OFF switch is in the OFF position.
✔ ✔
✔ ✔
✔ Switching on and off
CAUTION: before switching on or off, make certain that the sound system’s amplifiers are off or that all unit’s
outputs are automatically forced into MUTE status: this will avoid signal peaks, which are annoying and
sometimes dangerous (particularly for speaker enclosures).
✔ ✔
✔ ✔
✔ Connecting and preventing or identifying interference
Firstof all, check thatthe apparatus isinstalled in a placefree from industrialor RF (radio frequency)interfer-
ence. Avoid installing your equipment very near radio or TV sets, mobile phones, etc., as these can cause
noisyinterference.Whenconnectingtheotherpartsofyoursoundsystem,watchoutfortheso-called“ground
loops”, which could cause hum and jeopardize the products’s excellent Sound-to-Noise and low distortion
characteristics.
The best way (even if not always feasible) to avoid ground loops is to connect the electric ground of all the
equipment to a single central point (“star” system). In this case, the central point can be the mixer.
✔ ✔
✔ ✔
✔ Protection and maintenance
Don’t force knobs or switches: these are designed and manufactured to respond to light pressure and could
bedamaged if used withexcessive force. Take care of yourconnector cables, a veryfrequent cause ofsmall/
bigproblems.Alwaysgripthem by the connector,avoidpullingthemforcefullyand wind them without forming
knots or sharp bends: they’ll last longer this way, and be more reliable, which is a definite advantage.
Avoid exposing the product to strong direct sunlight, high temperatures or intense vibrations, in very dusty or
particularly damp surroundings or, even worse, in the rain: this will help to avoid the risk of faulty operation,
deterioration or even electric shocks and fires. The product is built in shock-resistant material. Nevertheless,
protect it during transport with a flight-case to avoid the risk of any casual accidents. When you’ve finished
using the apparatus, it’s always advisable to protect it from dust, but any dust that does form should be
removedusingaclothorasoftbrush.Neverusealcohol,acetoneoranysolvents.Theeffectdoesnotrequire
any other maintenance.
✔ ✔
✔ ✔
✔ In the event of breakdown
All user-adjustable parts are external and easily accessed. In the event of a breakdown, do not open the
apparatus, but contact the nearest Generalmusic/Lem Service Centre.
✔ ✔
✔ ✔
✔ Keeping the documentation
Keep this user’s manual for future consultation. Also remember that the effect will get a better price on the
secondhand market if (as well as being in good condition) it has its original documentation and packaging.
Warnings and Installation

5
Introduction
Congratulations for having chosen the DX 24!
DX 24 is an extremely versatile digital processor for loudspeaker systems based
on the GENERALMUSIC custom DSP RED 208. This powerful 40 bit resolution DSP,
together with low-noise 24 bit converters, provides an extremely high processing quality
and a dynamics suitable for the most professional applications.
DX 24 has 2 inputs and 4 independent outputs and can be configured as 2-
way stereo, 2, 3 and 4-way mono or as distribution mixer with up to 4 outputs. Configurations that
allows the 2 input signals to be summed and routed to different outputs are also available
Each of the 2 inputs has:
- MASTER DELAY, available also on the input SUM;
- 5-BAND PARAMETRIC EQ;
- level control.
Each of the 4 outputs has:
- DELAY line;
- 5-BAND PARAMETRIC EQ;
- CROSSOVER HP and LP filters which can be selected from the BESSEL, BUTTERWORTH and
LINKWITZ-RILEY types with slopes up to 48dB;
- phase control with 5° steps through a full 360°;
- digital LIMITER;
- level and MUTE control.
All settings can be stored and recalled in an instant. In fact, the system has:
- 17 Factory PRESETS, each of which can be used as a basic configuration for preparing custom
PRESETS, others already optimized for LEM loudspeaker systems.
- 32 User PRESETS, which can be freely programmed to store all the system settings.
Each User PRESET can contain any of the Input/Output configurations available.
All operations are carried out via user interface that includes a 2x16 LCD, a convenient DIAL for
the parameter modification and selector buttons for the direct access to all the features. DX 24 is also
equipped with a complete MIDI interface for the remote control thru a PC and for the linking of more
units.
Introduction

6
Front Panel
MODE
Key for selecting the PRESET, DELAY, EDIT and UTILITY menus.
Selection is made by pressing MODE repeatedly until the required menu is reached, indicated by
the relative LED. Selecting a menu allows access to the editing of its parameters. If none of the
menu LEDs are lit, the display shows the name of the current PRESET (i.e. the PRESET currently
loaded in the memory) and no parameter can be modified.
LEDs MENU
Show the selection status of the PRESET, DELAY, EDIT and UTILITY menu.
DISPLAY
Backlit 2x16 display.
Allows to view the pages of the various menus and the relative parameters.
PREV / NEXT
Menu page navigation keys.
Each menu is made up of several pages, which can in turn contain other pages or a variable number
of parameters. The PREV and NEXT keys allow to go to the previous page or the next one
respectively.
tu
Navigation cursor keys.
Each editing page contains a variable number of parameters (fields).
The tand ukeys allow to move the cursor in the page, selecting the various parameters available
as required.
DIAL
Encoder for editing values.
Allows to modify the value of the selected parameter.
Turn the DIAL clockwise to raise the value and counter clockwise to lower it.
Front Panel

7
ENTER
Enter key.
☞Allows access to the editing page whose name is shown on the display.
In some cases (e.g. PRESET name) also allows to:
☞Access the editing of the selected parameter
☞Confirm the value entered
ESC
Escape key.
☞Allows to exit the editing page shown on the display, confirming the value entered.
In some cases (e.g. PRESET name) also allows to:
☞Exit the editing of the selected parameter
☞Reject the value entered and return to the stored value.
INPUT LEVEL A-B
LED ladders indicating the level of inputs A and B.
N.B.: the input gain is adjusted using the INPUT GAIN parameter (EDIT menu).
To ensure a good signal/noise ratio, i.e. an up-front distortion-free signal, keep the signal quite
high, but make certain the red CLIP LED doesn’t light up continually. CLIP.
OUTPUT LEVEL 1-2-3-4
LED ladders showing the level of the respective outputs.
N.B.: the output level is adjusted using the OUTPUT GAIN parameter (EDIT menu).
IMPORTANT! Enabling the LIMITER on any output also changes the way in which the level is
displayed on the corresponding LED ladder: in this case, in fact, the level shown on the ladder is
no longer the “absolute” output level, but the level of the signal at -24dB, -12dB, -6dB compared
to the LIMITER threshold (orange LIMIT LED), whatever the threshold value is.
MUTE 1-2-3-4
Keys with LEDs for muting the signal of the respective outputs.
When the LED is lit, the MUTE function is enabled and no signal is fed to the relative output.
N.B.: this function is useful for avoiding signal peaks (bumps) when the sound system is switched on and off, for
isolating the individual audio sections during testing or sound checks, to enable or disable sound reinforcement zones
quickly, etc.
The mode in which the MUTE function is restored when the unit is switched on can be set using
the Wake Up function (UTILITY menu, Misc. Setup submenu) and can be set as Normal (last
setting before the unit was switched off) or Mute (all outputs automatically forced into Mute status).
Front panel

8
Rear Panel
INPUTS A-B
Audio inputs of the respective sections. XLR-F Connectors.
The A/D conversion is made with 20 bit converters.
OUTPUTS 1-2-3-4
Audio outputs. Balanced XLR-M connectors.
The D/A conversion is made with 24 bit converters.
MIDI IN, THRU, OUT
MIDI Interface Ports.
Allows MIDI communications between a DX 24 and a PC or other DX 24 units.
Communication protocol includes:
- Remote control: connecting the DX 24 to a PC and using the LEM editing software is possible
to remotely control all the processor functions.
- PRESET DUMP: connecting two DX 24 it’s possible to DUMP the single PRESETS from one
unit to the other (see DUMP procedure).
- PROGRAM CHANGE commands send/receive: connecting two DX 24 it’s possible, when a
PRESET is recalled on the first one, to send a PROGRAM CHANGE command to the second one
to recall the same PRESET number (see LOAD PRESET procedure).
NOTE: the DX 24 remote control is NOT available in the O/S Release 1.0.
POWER
Unit’s ON/OFF switch.
Before switching on or off, make certain that the sound system’s amplifiers are off to avoid signal
peaks, which are annoying and sometimes dangerous.
AC ~
Connector for the power supply cable.
Before switching on the unit, make certain that the mains voltage matches that shown on the rear
(a tolerance of up to ±10% is acceptable). Before connecting or disconnecting the power cord,
make certain the ON/OFF switch is in the OFF position.
Rear Panel

9
Signal Processing
Balanced inputs (IN A & IN B).
20-bit A/D converters.
LED ladders for monitoring input signals.
5-band parametric equalizers for A & B inputs.
3 delay lines (IN A, IN B & Sum A+B).
Routing System for connecting INPUTS and OUTPUTS.
Delay lines in 1-4 output.
Low-pass filters (LPF) with phase fine control - CROSSOVER.
High-pass filters (HPF) - CROSSOVER.
5-band parametric equalizers for the outputs.
Output level controls.
Polarity inverter.
Output level LIMITERS.
LED ladders showing output levels and limiter action.
Output MUTING controls.
24-bit D/A converters.
XLR-M balanced outputs.
Signal Processing

10
Getting Started
Before starting
Attention!
Before starting work, remember that the DX 24 is a powerful versatile signal processor mainly designed
for use with audio systems, whose input and output routing configurations can be set only by recalling
one of the PRESETS included in the internal memory. These characteristics mean that correct careful
use must be made of the unit and users must be sufficiently familiar with the unit’s main functions.
So before going ahead, it’s advisable to get to know at least the introductory part of this manual.
The Basic Principles of Navigation and Editing
All the DX 24 parameters and functions can be accessed and edited using the buttons on the front panel.
All available information is shown on each occasion on the display.
The control software is organized in the PRESET, DELAY, EDIT and UTILITY menus, each of which
contains the relative types of parameters and functions. The navigation, i.e. access to the system’s menus,
and changes of the various parameters follow logical criteria, which can be summed up as follows:
☞The menu is selected using the MODE key.
☞The menu selected is indicated by the relative menu LED and showed on the display.
☞In default conditions (i.e. when none of the menu LEDs are lit), the display shows the principle infor-
mation on the PRESET currently loaded in the memory.
☞Each menu is made up of several pages, which can be reached using the PREV and NEXT keys.
☞Each page is accessed by means of the ENTER key and left using the ESC key or MODE key.
☞A page can contain other pages. In this case, the name of the page is preceded by an arrow ➔
☞Each page contains one or more parameters (fields), which can be selected using the tand u
keys.
The selected parameter can be identified by its flashing characters.
☞Changes are made to the selected parameter by means of the DIAL knob.
Changes have immediate effect and, apart from a few exceptions (for example when assigning a
name to a PRESET), don’t need to be confirmed to be entered.
Getting Started

11
Configuration of the System
☞Refer to the Configurations chapter to find the DX 24 configuration which corresponds with your
sound system (2 x 2 ways; 2 x 2 ways with Mono Sub + Aux Mono; etc.)
☞RefertotheConnections chapterand,withthe equipment switched off,carryouttheaudioandpower
connections among the various components of your sound system.
☞Connect the mains cable and switch on only the DX 24. The display shows data regarding the operat-
ing system release for a few seconds.
LEM DX24
---rel.1.0---
At the same time, the system restores the exact operating conditions at the time of switching off.
N.B.: in actual fact, a “photograph” of the last scene used is uploaded. This includes the last PRESET loaded, all the
temporary changes (if any) made to it and the settings of the various options of the system.
The system then enters default status, showing the main operating information on the display.
A13 B24
2U2x2W
☞Set all the DX 24 outputs in MUTE status (LEDs lit) by pressing the relative keys.
☞Load the Factory PRESET containing the configuration you’ve found:
Press the MODE Key until the PRESET menu LED lights up.
The display shows the Load PRESET page:
Load Preset
3F2W+MSB+MAX (example)
Use the DIAL to find the necessary Factory PRESET (indicated by the letter F). Check that if, among
the PRESETS available, there are already some optimized for the specific speaker enclosures being
used.
Press ENTER.
The display shows the PRESET loaded in the unit’s memory and the relative configuration:
A1 B2 S34
3F2W+MSB+MAX (example)
Getting Started

12
Adjusting the input signal
Settingtheinputsignalofa digital unit is particularly important, much morethanwithananalogunit, as
any saturation of the A/D converters caused by excessively high input signals cause a typical particu-
larly distinct noise (high level square wave).
Proceed as follows:
☞Keep the DX 24 outputs in MUTE status (LEDs lit).
☞Feed a signal in on the DX 24’s input and watch the INPUT LEVEL A-B LED ladders.
Toobtainagood signal/noise ratio, i.e.anup-front distortion-free signal, keepthesignal quite high, but
make certain the red CLIP LED doesn’t light up continually.
☞Firstof all, find theoutput level settingfor your mixer (orother unit) connected to the input ofthe DX 24
☞Then adjust the DX 24 input gain if necessary:
Press the MODE key until the EDIT menu LED lights up.
Use the PREV and NEXT keys to go to the Input Gain page:
ÒIn
p
ut Gain
Press ENTER. The display shows the INA Gain or INA&B Gain page (according to the configuration
and other utilities loaded in the memory):
INA GAIN
0.0dB
INA&B GAIN
0.0dB
Use the DIAL to change the gain value and watch the level of the signal on the LED ladders until the
ideal values are reached.
INA GAIN
-2.5dB
INA&B GAIN
+6.0dB
Thenusethe PREV andNEXT keystoaccessthe INB Gain page(ifthereis one–thisdependson the
configuration and the other utilities loaded in the memory).
Repeat the settings as explained above.
Getting Started

13
First Setup
At this point, the first custom setup can be prepared.
The following is only a description of setup procedure.
The detailed specifications of each parameter are shown in the respective paragraphs of the manual.
☞Firstly, set the following parameters in the order shown:
Output Pol. Polarity of the outputs
Xover Crossover frequencies (separation of the speaker channels)
Output Delay Alignment of the speaker enclosure components
Output Gain Levels of the outputs
N.B.: the regulation of the DX 24’s parameters is closely linked to the characteristics of the sound system’s components.
So if you’re not experts, refer to the documentation and technical specifications of your power amplifiers, loudspeaker
enclosures, monitors, etc. This will enable you to work faster and safely.
☞DisabletheMUTE function ontheoutputsyouintendusing and listenthesound,carryoutinstrumental
checks (if you have the necessary equipment) and any corrections required.
☞Then, if necessary, adjust the values of the following functions:
Output EQ Output equalizers
Output Limiter Output limiters
N.B.: in this first phase of setting up your sound system, the adjustment of these functions (which are very useful, if
not indispensable during installation) can wait. Remember however that adjusting the equalizers also affects the signal
level. So if considerable equalization changes are made, remember to check and if necessary adjust the output levels
too.
Getting Started

14
Display information in default conditions
In default conditions, i.e. when none of the menu LED’s is lit, so no type of editing is enabled, the
display shows the main information on the PRESET currently stored in the memory:
A13 B24
2U2x2W
There are various information areas:
System configuration
A12B3S4
4U3W+BSB+MAX System configuration
The bold letters indicate the inputs:
A= Input A
B= Input B
S= SUM (sum of inputs A and B)
Numbers 1, 2, 3and 4indicate the respective outputs.
In the example:
The signal connected to Input Ais assigned to outputs 1and 2.
The signal connected to Input Bis assigned to output 3.
The Sum of the signal on inputs Aand Bis assigned to output 4.
The system is therefore configured as shown in the following diagram.
Getting Started

15
Number of PRESETS
A12B3S4
4U3W+BSB+MAX Number of PRESET
17 Factory PRESETS and 32 User PRESETS are available.
Type of PRESET
A12B3S4
4U3W+BSB+MAX Type of PRESET
There are 2 categories of PRESETS:
F= Factory PRESETS factory programmed, cannot be permanently changed.
Theseinclude all the system’s usable configurations + some specific setups
for LEM enclosures.
These are the starting points for creating User PRESETS from scratch.
U= User PRESETS can be programmed by users.
Name of the PRESET
A12B3S4
4U3W+BSB+MAX Name of the PRESET
In the example, the name indicates a two-way stereo system + two auxiliary mono outputs.
N.B.: the name of a Factory PRESET normally indicates the general structure of the sound system to be connected
to the DX 24 or of a specific speaker enclosure model.
The name of a User PRESET can be edited as required. For example:
A12B3S4
4UM
y
Li eSetu
p
Getting Started

16
PRESET Modifications
M A12 B3 S4
4U3W+BSB+MAX PRESET Modifications
This indication shows that the value of one or more parameters has been temporarily modified with
respect to the values stored in the PRESET shown.
Practically speaking, this indication means that the changes made to the PRESET have not been
stored.
N.B.: once it has been enabled, the indication remains even if the “original” values are reset manually.
The indication disappears as soon as the PRESET is saved or as soon as a new PRESET is loaded
(including this same PRESET).
In other words, the indication disappears as soon as stored values are accessed.
IfthePRESETisn’tsaved, temporary changes are lost assoonasa new PRESET is loaded (including
this same PRESET).
N.B.: temporary changes are kept on the other hand in the “buffer memory”: when the unit is switched on, the system
maintains exactly the same settings as when the unit was switched off, including temporary changes.
System Protection
T A12 B3 S4
4U3W+BSB+MAX
P A12 B3 S4
4U3W+BSB+MAX
Theseindicationsappearwhen the LOCK function (UTILITY menu)isenabled,i.e.whenthesystemis
totally (T) or partially (P) protected against accidental or unauthorized changes (even if temporary).
Protection is ensured by a password, without which editing procedure can’t be unlocked.
Getting Started

17
Menu map
Menu map
The control software is organized in PRESET, DELAY, EDIT and UTILITY menus, each of which contains
the relative types of parameters and functions.
To facilitate menu navigation, refer to the following map:
menu
PRESET Load Preset
Store Preset
Dump Out Preset
Incomin
g
Dump
menu
DELAY Input Dela
y
Output Dela
y
parameters
parameters
menu
EDIT Input Gain
Xover
Input EQ
Output EQ
Output Gain
Output Pol.
Output Limiter
parameters
parameters
parameters
parameters
parameters
parameters
parameters
parameters In these pages, the number of the parameters and how they are presented varies according
to the configuration of the PRESET and according to Ganging and Units settings (UTILITY menu). In fact, these pages
only show the parameters that can actually be used, in the most suitable form of editing.
Menu map

18
menu
UTILITY
Midi Setup MIDI Pr
g
Ch In
Gan
g
in
g
Input Gan
g
in
g
Output Gan
g
in
g
Dela
y
UnitUnits
Lim. Thresh. Unit
Temperature Unit
Misc. Setup Output Meters
Temperature
Wake Up
LCD Contrast
Lock Lock
MIDI Pr
g
Ch Out
Menu map