LEM DX 24 Owner's Manual
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LEM DX 24 Owner's Manual

40-bit digital loudspaeker processor
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Summary of Contents for LEM DX 24

  • Page 2: Important Safety Instructions

    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...

  • Page 3: Table Of Contents

    Contents Contents Warnings and Installation ......4 Introduction ........5 Front Panel.
  • Page 4 Contents DELAY Menu ....... . . 25 The practical differences between Input and Output Delay ..25 Input Delay .
  • Page 5 Contents Misc. Setup submenu ....... . . 41 Output Meters ......... . 41 Temperature .

  • Page 6: Warnings And Installation

    ✔ ✔ ✔ ✔ ✔ 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.

  • Page 7: Introduction

    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...

  • Page 8: Front Panel

    Front Panel 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.
  • Page 9 Front panel 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 Escape key. Allows to exit the editing page shown on the display, confirming the value entered.

  • Page 10: Rear Panel

    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.

  • Page 11: Signal Processing

    Signal Processing 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.

  • Page 12: Getting Started

    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.

  • Page 13: Configuration Of The System

    Refer to the Connections chapter and, with the equipment switched off, carry out the audio and power 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.

  • Page 14: Adjusting The Input Signal

    CLIP LED doesn’t light up continually. First of all, find the output level setting for your mixer (or other unit) connected to the input of the DX 24 Then adjust the DX 24 input gain if necessary: Press the MODE key until the EDIT menu LED lights up.

  • Page 15: First Setup

    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.

  • Page 16: Display Information In Default Conditions

    Getting Started 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: A 1 3 B 2 4 2 x 2 W There are various information areas:...

  • Page 17: Number Of Presets

    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:...

  • Page 18: Preset Modifications

    Getting Started PRESET Modifications M A 1 2 B 3 S 4 PRESET Modifications 3 W + B S B + M A X 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.

  • Page 19: Menu Map

    Menu map 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 Load Preset PRESET Store Preset Dump Out Preset...
  • Page 20 Menu map menu Ganging Input Ganging UTILITY Output Ganging Units Delay Unit Lim. Thresh. Unit Temperature Unit Misc. Setup Output Meters Temperature Wake Up LCD Contrast Lock Lock Midi Setup MIDI PrgCh In MIDI PrgCh Out...

  • Page 21: Variations Of The Audio Parameter Editing Pages

    Variations of the Audio Parameter editing pages parameters DX 24 can be configured with a large number of IN/OUT combinations. In some configurations certain parameters aren’t used. To streamline editing, the system only presents the parameters that can be used on each occasion.
  • Page 22 Menu map This also affects the number and contents of the editing pages on each occasion. For example, the INPUT DELAY editing pages can have the following variations: DX 24 - INPUT DELAY EDITING PAGES INPUT CONFIGURATION PAGES PARAMETERS GANGING...

  • Page 23: Preset Menu

    PRESET menu PRESET menu This menu allows access to the Presets’ control: menu Load Preset PRESET Store Preset Dump Out Preset Incoming Dump There are 2 distinct categories of PRESETS: Factory PRESETS Factory-programmed storage. Factory PRESETS can be used normally, temporarily modified, but can’t be cancelled, overwritten or permanently modified.

  • Page 24: Load Preset

    Loading a Preset, a Program Change command could also automatically be sent to the MIDI OUT port and can be used to automatically load a PRESET with the same number to any other DX 24 units connected and enabled (see UTILITY menu - Midi Setup submenu - MIDI PrgCh Out and...

  • Page 25: Store & Naming Preset

    PRESET menu Store & Naming PRESET This menu page allows to create new PRESETS, i.e. to save all the current system settings. S t o r e P r e s e t 2 W + M S B + M A X To save a PRESET: Use DIAL to reach the memory area in which the PRESET is to be saved.

  • Page 26: Dump Out Preset

    This menu page allows to download a PRESET via the MIDI ports. This allows to immediately “copy” the settings of the various PRESETS of a DX 24 to another DX 24. D u m p O u t P r e s e t...

  • Page 27: Delay Menu

    DELAY Menu DELAY Menu This menu allows to work on the system’s delay lines. menu Input Delay parameters DELAY Output Delay 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.

  • Page 28: Input Delay

    DELAY Menu Input Delay This menu page allows to adjust the delay lines of Input A, Input B and SUM. I n p u t D e l a y Ò The values can be set in the following ranges: INPUT DELAY unit range...

  • Page 29: Output Delay

    DELAY Menu Output Delay This menu page allows to adjust the delay lines of outputs 1, 2, 3 and 4. O u t p u t D e l a y Ò The values can be set in the following ranges: OUTPUT DELAY O P 1 D E L A Y...

  • Page 30: Edit Menu

    A/D converter due to an excessively high input signal causes a typical particularly distinct noise. To achieve a good signal/noise ratio, i.e. an up-front distortion-free signal, feed a signal in on the DX 24’s input and watch the INPUT LEVEL A-B LED ladders. Keep the signal quite high, but make certain the red CLIP LED doesn’t...

  • Page 31: Input Eq

    EDIT menu Input EQ Input equalizer with 5 parametric filters. Allows to alter the overall tone of the signal connected to the respective input. Also called Master EQ, the equalization of the input signal effects all the outputs connected to the input and the input SUM.

  • Page 32: Type Of Filter

    EDIT menu The following editable parameters are available for each filter: Type of filter Allows to choose among Peaking, Low or High Shelving with a slope of 6 or 12 dB per octave and Notch filter. I N A E Q 1 P e a k 2 k 0 0 1 .

  • Page 33: Gain

    EDIT menu Gain Allows to control the boost or cut of the selected frequencies. It’s not used with the Notch Filter, which has a fixed cut. I N A E Q 1 P e a k 2 k 0 0 1 . 0 - 5 .

  • Page 34: Xover

    EDIT menu Xover Low-pass and high-pass filters. Made up of a combination of a low-pass filter and high-pass filter, the crossover allows to divide the audio signal into segments that can be used by the individual sections of a sound system (for example High, Mid &...

  • Page 35: Type Of Filter

    EDIT menu Each filter has the following editable parameters: Type of filter Allows to choose three different types of filter and different attenuation slopes: Butterworth (But) at 6, 12, 18 or 24dB per octave, Bessel (Bes) at 12, 18 or 24dB per octave, Linkwitz-Riley (LR) a 12, 24 or 48dB per octave.

  • Page 36: Output Eq

    EDIT menu Output EQ Output equalizer with 5 parametric filters. Also called Channel EQ, allows to alter the tone of each individual output. The characteristics of quality and programmability are identical to those of the Input Equalizer and enable this unit to be used extremely effectively and flexibly. O u t p u t E Q Ò...

  • Page 37: Output Gain

    EDIT menu Output Gain Output level control. Allows to adjust the signal level of each individual output. O u t p u t G a i n Ò Editing values are between +6dB ÷ -30dB, with 0.5dB steps. O P 1 G A I N - 6 .

  • Page 38: Output Limiter

    EDIT menu Output Limiter Output level limiter. Allows to keep the signal of each individual output within a set level. Can be used effectively to protect the components of a sound system. O u t p u t L i m i t e r Ò...

  • Page 39: Utility Menu

    UTILITY Menu UTILITY Menu This menu comprises a series of submenus that allow to set a series of system options and access certain utilities, such as the MIDI setup or the protection against accidental or unauthorized changes: menu Ganging Input Ganging UTILITY Output Ganging Units...

  • Page 40: Ganging Submenu

    UTILITY menu ANGING SUBMENU Ganging Input Ganging Output Ganging This submenu allows to group together the treatment of similar inputs and/or outputs. Similar is intended as meaning elements which have the same properties and/or the same structure. For example, the right and left sections of a stereo system are similar, as they are made up symmetrically of the same quantity and type of elements (the same components for High, Mid and Low frequencies).

  • Page 41: Input Ganging

    UTILITY menu So generally speaking, to avoid contradictions, oversights and confusion between what is shown and what is effectively carried out, it’s advisable to enable the Ganging functions before starting to edit a PRESET. Moreover, it’s best to make certain to effectively set the required value, manually confirming all the parameters required. N.B.: the elements in Ganging assume the “new”...

  • Page 42: Units Submenu

    UTILITY menu NITS SUBMENU Units Delay Unit Lim. Thresh. Unit Temperature Unit This submenu allows to choose the measurement units to be used with certain functions. U n i t s Ò Delay Unit Allows to set the measurement units in which Delays are expressed (DELAY menu). The options include: m = meters - mm = millimeters - ms = milliseconds - ms = microseconds Measurement units for Input Delay Measurement units for Output Delay...

  • Page 43: Misc. Setup Submenu

    UTILITY menu ETUP SUBMENU Misc. Setup Input Select Output Meters Temperature Wake Up LCD Contrast This submenu allows to set a series of system options. M i s c . S e t u p Ò Output Meters Allows to decide whether to display the outputs’ signal before or after MUTE. The options include: PreMute PostMute...

  • Page 44: Temperature

    N.B.: the measurement units can be chosen between °C (degrees Centigrade) and °F (degrees Fahrenheit) by means of the Temperature Unit function (UTILITY menu - Units submenu). Wake Up Allows to choose the mode in which MUTE functions are restored when the DX 24 is switched The options include: Normal...

  • Page 45: Lock Submenu

    UTILITY menu OCK SUBMENU Lock Lock Allows to enable or disable the protection of the system against accidental or unauthorized changes. L o c k Ò This function is very useful whenever even temporary changes or tampering with the settings stored in the system must be prevented.

  • Page 46: How To Disable The Protection

    UTILITY menu How to disable the protection If the protection is enabled, when the system is in default status (i.e. when none menu LEDs are lit and therefore no type of editing is enabled), the following appears on the display: Total Protection enabled Partial Protection enabled A 1 3 B 2 4...

  • Page 47: Mid Setup Submenu

    Ò MIDI PrgCh In Allows to set the MIDI channel on which to receive Program Change commands sent by other units, e.g. a computer or another DX 24. Settings can be: Off: ignores the Program Change commands received. M I D I P r g C h I n...

  • Page 48: Program Change Out

    Preset with the corresponding number from its own memory. In a MIDI chain of DX 24 units, this means that all the units set to accept this command on the same MIDI Channel load the same number of Preset, even if on the various units this number corresponds to Presets with different contents.

  • Page 49: Configurations

    Configurations Configurations The following diagrams show the DX 24’s various system configurations, as if to say the various input and output hardware combinations.
  • Page 50 Configurations...

  • Page 51: Connections

    Connections Connections The following diagrams show the schemes of the recommended cables and some connection examples referred to various system configurations. A & B Inputs BALANCED XLR-M 1÷4 Outputs BALANCED XLR-F MIDI IN / OUT / THRU MIDI standard cable...
  • Page 52 Connections...
  • Page 53 Connections...
  • Page 54 Connections...
  • Page 55 Connections Communications: PC & one or more DX 24 connection...
  • Page 56 Connections Communications: two or more DX 24 short distance connection...

  • Page 57: Factory Presets

    PFC5 (1500W/4ohm) + IMPORTANT NOTE The OUTPUT LEVEL and LIMITER THRESHOLD settings of the FACTORY PRESETS for LEM enclosures have been made considering the OUTPUT POWER and INPUT SENSITIVITY specifications of the LEM POWERFACTOR amplifiers in the CONSTANT GAIN (26dB) configuration.

  • Page 58: Technical Specifications

    Technical Specifications Technical Specifications INPUT section Connectors 2 x XLR-F Nominal input sensitivity 0 dB (0.775 V) Input Impedance 30kOhm, electronically balanced Maximum Input Level +14dBu Input Gain -30 / +6 dB variable in 0.5 dB steps Output Section Connectors 4 x XLR-M Output Impedance 600 Ohms, electronically balanced...
  • Page 59 FEDERAL COMMUNICATIONS COMMISSION NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
  • Page 60 Sales Division: 47842 S.Giovanni in Marignano (RN) – Via delle Rose, 12 – tel. +39-0541-959511 – fax +39-0541-957404 Internet: http://www.lemaudio.com...

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