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Lectrosonics DMPA12 Reference Manual

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DMPA12
Digital Power Amplifier
Fill in for your records:
Serial Number:
Purchase Date:
REFERENCE MANUAL
Rio Rancho, NM, USA
www.lectrosonics.com

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Summary of Contents for Lectrosonics DMPA12

  • Page 1 REFERENCE MANUAL DMPA12 Digital Power Amplifier Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.com...
  • Page 2 DMPA12 Digital Power Amplifier LECTROSONICS, INC.

  • Page 3: Important Safety Instructions

    Reference Manual Important Safety Instructions This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure -- voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature.
  • Page 4 DMPA12 Digital Power Amplifier Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

  • Page 5: Table Of Contents

    Limiter Tab ......................................28 Rear Panel Control Tab ..................................30 DMPA12 Menus and Functions ................................34 Setting up Front Panel controls ................................34 DMPA12 Serial Interface and General Commands ...........................36 DMPA12 General Commands ................................36 DMPA12 Output Compressor Commands ............................43 DMPA12 Output Limiter Commands ..............................44 DMPA12 Programmable I/O Commands ............................45...

  • Page 6: General Overview

    “gas gauge” for DSP resources and The DMPA12 digital power amplifier takes its input from still less than 4 ms of latency. The choice of processor the DANI bus, with each output able to source from the...
  • Page 7 Reference Manual The LecNet 2 product family includes a variety of com- The DMPA12 digital power amplifier takes its inputs ponents to address a wide variety of applications. Differ- from the DANI bus. It can access either the first 12 back...

  • Page 8: Dmpa12 System Configuration

    EXPANSION Slave EXPANSION DMPA12 Slave Output Channels 1 - 12 EXPANSION DMPA12 configured as Slave at bottom of stack DMPA12 Master Output Channels 1 - 12 EXPANSION Forward Propagation - 24 channels DMPA12 Slave If more than 12 outputs need to be...

  • Page 9: Dmpa12 Functional Block Diagram

    Reference Manual DMPA12 Functional Block Diagram Prog I/O Conn LecNet 2 Conn Front & Rear DB25 1/8 '' Jack USB B Conn Prog I/O RS-232 Port Port Port Off: No signal Green: Signal present 12 output tricolor Micro Orange: Compressor active...

  • Page 10: Output Processing

    DMPA12 Digital Power Amplifier Output Processing Compressor A versatile compressor is provided at each output to Extensive signal processing is available at each output, control the average level and dynamics of the audio sig- adding to the processing available in the mixer/proces- nal, and restrict the maximum output level to optimize sors in the system.

  • Page 11: Dmpa12 Controls And Features

    The gain of output audio channels is adjustable with • BLINKING ORANGE a fault exists on the output control knobs on the front panel of the DMPA12. This - check wiring for short circuits, etc. feature is useful for system setup and adjustment, and may be left enabled to allow users to “touch up”...

  • Page 12: Rear Panel

    DMPA12 Digital Power Amplifier Rear Panel 12 CHANNEL POWER AMPLIFIER This device complies with 1: GND 6: IN 9 11: OUT 5 16: IN 4 21: OUT 2 Part 15 of the FCC rules. 2: IN 1 7: IN 11...

  • Page 13: Installing Lecnet2 Software And Usb Driver

    As a result, connecting a computer ® system to a DMPA12 for the first time is different than 3. Select “Search for the best driver in these loca- subsequent installations. There are a few minor differ- tions.”, then check the box for “Search removable ences between installing the LecNet2 USB drivers on a media (floppy, CD-ROM...)”...
  • Page 14 DMPA12 Digital Power Amplifier Installing Additional DM Units 4. Windows will search the CD for the driver and when it has found it, a dialog will likely open warning you (or LecNet2 devices) that the driver has not passed Windows Logo Test- The Windows XP operating system regards all Lec- ing.

  • Page 15: Usb Driver Installation (Windows 2000)

    Hardware Wizard automatically opens. Use the follow- ing procedure to install the LecNet2 USB driver using the Wizard. 1. Connect a cable between the DMPA12’s USB port and the computer system (or one of the units in a multiple unit installation). Place the LecNet2 Instal- lation Disk in the computer system’s CD-ROM drive...

  • Page 16: Using The Update Wizard

    3. Any LecNet2 device detected on the USB port will v1_1_12.update”. The dots normally used to separate be listed. Click the DMPA12 unit to be updated. If the three parts of the version number are replaced with nothing appears on the list, or the unit to be updated underscores in the filename for clarity.
  • Page 17 DSP firmware, followed by an update of the control- ler firmware. Click Finish to close the Wizard. You can now connect to the newly updated DMPA12 with the control panel. The updated firmware ver- sion number should appear in the status bar.

  • Page 18: Initial Setup

    DMPA12 Digital Power Amplifier Initial Setup Connection The initial setup of a DMPA12 system is a simple four step process: For simplicity, the instructions shown on this page • Set the unit to the Master mode, if necessary include only USB and RS-232 connections for setup using a computer connected directly to the amplier.

  • Page 19: Dmpa12 System Setup Tabs

    Reference Manual DMPA12 System Setup Tabs Activity Tab Gain set on each channel is indicated in a window next The Activity Tab provides an “at a glance” monitoring to each level meter. Gain can be adjusted by entering of output levels, when the amplifier is connected to a a number directly into this window or with the vertical computer system.

  • Page 20: Source Tab

    • Matrix A signal from the DANI bus is used as the signal source. When the DMPA12 is operated as as a Slave in a multi- unit system, one of the 12 back propagated final mixes from the main mix matrix should be selected, or one of the 2 back propagated expansion mixes from the expansion mix matrix.

  • Page 21: Delay Tab

    Select the Delay Tab. Each output channel can be delayed for up to 200 ms, enough for virtually any application. If connected to a DMPA12, changes made in this tab take effect immediately. As always, the changes are not perma- nent unless the DMPA12 settings are stored to a preset in nonvolatile memory.

  • Page 22: Filters Tab

    This tab contains a notebook of output filter settings, with a separate page for each output channel. If con- nected to a DMPA12, changes made in this tab take Blue curve shows Select filter type with composite effect of all...
  • Page 23 Reference Manual Frequency response graph Setup parameters for the entire filter set belonging to an Each output channel page contains a graph which dis- output channel can be copied and pasted into another plays two plots: output channel also. This can save a lot of time when •...

  • Page 24: Compressor Tab

    This is a “soft” knee type If connected to a DMPA12, changes made in this tab with adjustable compression ratio, threshold and time take effect immediately. As always, the changes are not constant parameters.The compressor implementation is...
  • Page 25 Reference Manual Amplitude response graph Gain reduction meter Each output channel page contains a graph which dis- This meter displays the reduction in gain (in dB) that plays four plots: results from compressor activity. • A fixed plot for the 1:1 amplitude response used for Compressor status indicators reference (dashed grey line) These display the compressor status for all outputs.

  • Page 26: Gain / Level Tab

    Gain / Level Tab The controls and indicators for each output channel are grouped together. Always visible are the: If connected to a DMPA12, changes made in this tab • Gain control take effect immediately. As always, the changes are not permanent unless the DMPA12 settings are stored to a •...
  • Page 27 Reference Manual Level meter Output gain step size The default step size when using the buttons to run the This is a true RMS level meter which displays the out- gain up and down is 1dB. To change this right click on put audio level in dBu after digital signal processing is the channel group desired and choose Output gain step complete.

  • Page 28: Limiter Tab

    If con- detector controlled by a single time constant param- nected to a DMPA12, changes made in this tab take eter. This is an adaptive design which responds to effect immediately. As always, the changes are not...
  • Page 29 Reference Manual At times it may be necessary to restore limiter settings to their default values (+15dBu threshold, with default time constant). To do this right click within the Limiter setup group and choose Set to default values from the popup menu.

  • Page 30: Rear Panel Control Tab

    The DMPA12 has 11 programmable inputs which can face is to manage what is called the rear panel gain for be used to control a wide variety of DMPA12 functions. audio output channels. This is an additional gain value Depending on the function assigned to them, these in- that is added to the “main”...
  • Page 31 This is normally used with a momentary contact switch. control panel is connected to a DMPA12. For the Analog The range over which the gain of the audio output chan-...
  • Page 32 There are two ways to feature or features of the DMPA12 that the function ap- do this: plies to. These choices will vary according to the nature •...
  • Page 33 Reference Manual Programmable Outputs Notebook pulldown Invert Status Programmable Input Checkbox Selection Programmable Output Status Indicators Rio Rancho, NM...

  • Page 34: Dmpa12 Menus And Functions

    The gain of output audio channels is adjustable from from the Menu Bar. The Front Panel Gain Control Mute the front panel of the DMPA12. This feature is useful for dialog will open: system setup and adjustment, and may be left enabled to allow users to “touch up”...
  • Page 35 Complete information is available in the Help set the expansion mode to Master, allowing it to boot files provided in the supplied software. up. At this point the DMPA12 can be set back to Master mode using the control panel program if desired. Managing Macros...

  • Page 36: Dmpa12 Serial Interface And General Commands

    DMPA12 Digital Power Amplifier DMPA12 Serial Interface and General Commands Examples: DMPA12 General Commands REQUEST RESPONSE Command Description COMMAND !store(3)<CR> OK store(3)<CRLF> actpre Active preset number COMMAND !run={1,3,5}<CR> OK run={1,3,5}<CRLF> baud Serial port baud rate QUERY !outgn(3)?<CR> OK outgn(3)=0<CRLF> default...
  • Page 37 This is the “name” of the device used by the memory preset location used as the powerup de- the Lecnet2 protocol and is always “DMPA12”. The data fault. It may also be used as an update to set the default is a string type.
  • Page 38 This command may be used as a query to determine definitions if the DMPA12 is operating as a Master or as a Slave. For instance, to preserve output mutes and the state of It may also be used as an update to set the mode.
  • Page 39 The data is a string type. This command may be used to run a macro (an inter- Example: nally stored group of DMPA12 commands). A single macro may be run by using the command form. In REQUEST...
  • Page 40 DMPA12 Digital Power Amplifier DMPA12 Audio Output Commands Examples: REQUEST RESPONSE Command Description QUERY outdel(1)?<CR> OK 0<CRLF> outdel Audio output delay QUERY outdel(*)?<CR> OK {0,44,0,...,0,0,0}<CRLF> outfault Audio output fault status UPDATE outdel(2)=100<CR> OK<CRLF> outgn Audio output gain UPDATE outdel(*)={0,0,100,..., outgnfp Audio output Front Panel gain 0,0,999}<CR>...
  • Page 41 Front Panel gain, which is controlled by done by preceding the double-quote characters with a the knobs on the DMPA12 front panel. The output chan- backslash character like this: The \”Hula\” Room. Now it nel is specified by using the address syntax. Addresses can be passed as a string argument to the outlb com- must be in the range 1 to 12.
  • Page 42 DMPA12 Digital Power Amplifier outmttog (output mute toggle) This command may be used as a simple comand to toggle the output channel mute status. The output chan- nel is specified by using the address syntax. Addresses must be in the range 1 to 12.

  • Page 43: Dmpa12 Output Compressor Commands

    Reference Manual DMPA12 Output Compressor Commands outcpmug (output compressor makeup gain) Command Description This command may be used as a query to read the outcpgn Output compressor gain makeup gain, or as an update to set the makeup gain. outcpmug...

  • Page 44: Dmpa12 Output Limiter Commands

    DMPA12 Digital Power Amplifier DMPA12 Output Limiter Commands outlmtc (output limiter time constant) This command may be used as a query to read the time Command Description constant, or as an update to set the time constant. The outlmgn Output limiter gain output channel is specified by using the address syntax.

  • Page 45: Dmpa12 Programmable I/O Commands

    Reference Manual DMPA12 Programmable I/O Commands For analog gain control functions the values are the range 0 to 255, representing the voltage sensed by the programmable input (0 is 0 volts, 255 is 5 volts). For Command Description all other functions the value is either “1” meaning that...
  • Page 46 DMPA12 Digital Power Amplifier • The remaining values specify the target of the REQUEST RESPONSE function. These values are simply a list of one or QUERY prgindef(4)?<CR> OK {0}<CRLF> more integers which identifies the thing(s) that are (No function is assigned to programmable input 4.) controlled by the function.
  • Page 47 Reference Manual using the address syntax. Addresses must be in the REQUEST RESPONSE range 1 to 8. The data type is array of integer, with a UPDATE prgoutdef(1)= variable length. The values contained in the array repre- {1,5}<CR> OK<CRLF> sent the definition of a programmable output, using the (Function “Monitor programmable input state”...

  • Page 48: Dmpa12 Front Panel Control

    This command may be used as a query to determine if property values. the DMPA12 Front Panel gain controls are locked (dis- Examples: abled) or unlocked (enabled). It may also be used as an update to lock or unlock the controls.
  • Page 49 This command may be used as a query to deter- mine the status of the front panel mute feature of the DMPA12. It may also be used as an update to set en- able or disable this feature. If enabled, placing a front panel gain control in the fully counter-clockwise position will mute the audio on the channel.

  • Page 50: Dmpa12 Rear Panel Control Commands

    DMPA12 Digital Power Amplifier DMPA12 Rear Panel Control Commands rpoutgn (rear panel audio output gain) This command may be used as a query to read the Command Description rear panel output gain, or as an update to set the rear...
  • Page 51 Reference Manual rpoutgnst (rear panel output gain step change) This command is used as an update to step the gain by the amount specified, either up or down. The out- put channel is specified by using the address syntax. Addresses must be in the range 1 to12. The data type is integer, in the range -6 to +6, representing the gain step in dB.

  • Page 52: Dmpa12 Command Grammar Rules

    DMPA12 Digital Power Amplifier DMPA12 Command Grammar Rules Augmented BNF[1] Rules for the LecNet2 command grammar: OCTET = %x00-FF ; <any 8-bit sequence of data> CHAR = %x01-7F ; any US-ASCII character except NUL (1 - 127) UPALPHA = %x41-5A ; any US-ASCII uppercase letter “A”..”Z” LOALPHA = %x61-7A ; any US-ASCII lowercase letter “a”..”z” DIGIT = %x31-39 ; any US-ASCII digit “0”..”9”> LF = %x0A ; US-ASCII LF, linefeed (10) = %x0D ; US-ASCII CR, carriage return (13) SP = %x20 ; US-ASCII SP, space (32) HT = %x09 ; US-ASCII HT, horizontal tab (9) DQUOTE = %x22 ; US-ASCII double-quote mark (34) QCHAR = %x01-21 / %x23-7F ; any CHAR except DQUOTE WS = SP / HT SIGN = “-” / “+”...

  • Page 53: Macros And Macro Control

    DMPA12. All of the commands contained in the macro can then be executed by issuing a single Run command to the DMPA12. There are two advantages to this approach: Efficiency - only one command needs to be sent to the DM to execute complex actions, which may involve dozens of individual commands.

  • Page 54: Rear Panel Control With Hardware

    DMPA12 Digital Power Amplifier Rear Panel Control with Hardware The DMPA12 processor has programmable inputs which can be used to control a wide variety of functions. Depending on the function assigned to them, these programmable inputs may be connected to momentary contact switches, toggle switches, or potentiometers.
  • Page 55 Reference Manual Rio Rancho, NM...
  • Page 56 This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item.

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