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Lectrosonics DSP4/4 DUAL Operating Instructions And Troubleshooting Manual

4 in / 4 out digital audio processor; dual 4 in / 4 out digital audio processor
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DSP4/4
4 In / 4 Out Digital Audio Processor
DSP4/4
DUAL
Dual 4 In / 4 Out Digital Audio Processor
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM
www.lectrosonics.com

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Summary of Contents for Lectrosonics DSP4/4 DUAL

  • Page 1 DSP4/4 4 In / 4 Out Digital Audio Processor DSP4/4 DUAL Dual 4 In / 4 Out Digital Audio Processor OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.com...

  • Page 2: Table Of Contents

    8 of the 13 pins can also be programmed as “out- puts,” used to trigger external indicators or other functions. The DSP4/4 has an RS-232 port for remote setup or control by a computer or other RS-232 compatible controller.

  • Page 3: General Technical Description

    LED as an indication of whether an output is muted or unmuted. An RS-232 port is available to allow almost all of the functions of the DSP4/4 to be controlled either by a computer or a dedicated control system (such as AMX or Crestron systems).

  • Page 4: Installation

    DSP4/4. DSP4/4 Audio Outputs Each of the four DSP4/4 outputs is balanced. To use an output in the unbalanced line level mode, take the signal from the “+” output connection and the output ground. Leave the “-” output floating.

  • Page 5: Front Panel Description

    Line Output to the ground of the unbalanced device. Do not ground the “-” terminal of the Line Output. PROGRAMMABLE INPUTS - Allows remote control of a number of DSP4/4 functions. Pins 1-8 on the 15 pin D-Sub connector may be programmed to be either programmable inputs or programmable outputs. Pins 9-13 are program- mable inputs only.

  • Page 6: Differences Between The Dsp4/4 And Dsp4/4 Dual

    RS-232 TX Ground Ground PWR IN - Connects to the CH40 (for the DSP4/4) or the PS60 (for the DSP4/4 DUAL) power supply to provide power for the unit. DIFFERENCES BETWEEN THE DSP4/4 AND THE DSP4/4 Dual The DSP4/4 Dual is simply two DSP4/4s in one box sharing a common power supply. Audio inputs and outputs are labeled 1A through 4A on one unit and and 1B through 4B on the other unit.

  • Page 7: Operating Instructions

    Normally, several filters (2 to 4) are set to the ADFE function and deployed to notch out the worst feedback frequen- cies in the room, and then the setup is stored into memory. Any time the setup is stored into the DSP4/4 memory or to disk, the frequency of any ADFE filter that has been deployed will also be stored.
  • Page 8 After a filter is deployed to notch out feedback, it will remain on that frequency until the DSP4/4 is powered down. At the next power up, the filter will again be available to be deployed as any other feedback occurs.

  • Page 9: Dsp4/4 Control Panel Software

    DSP4/4 memory preset. The Preset 1 through Preset 8 selections copy a single preset, while the All Presets selection copies all 8 presets to the DSP4/4. After a preset is loaded to the DSP4/4, it will be transferred to the active DSP4/4 setup.
  • Page 10 LecNet directory (default: c:\lecnet). If new DSP software is downloaded from the Web site, the file should be placed in the LecNet directory. Anytime the DSP4/4 Control Panel is run, it will check for .cnv DSP software files which are more recent than the DSP software revision in the DSP4/4.

  • Page 11: Software Control Panel Screens And Functions

    4 In / 4 Out Digital Audio Processor SOFTWARE CONTROL PANEL SCREENS AND FUNCTIONS Input Gain Tab The Input Gain tab allows the input gain and input rear panel (i.e. programmable input) parameters to be set. Input Gain 1-4 - Allows the input gain level to be trimmed between +10dB and -68dB, or Off.
  • Page 12 Input/Output Crosspoint Matrix Tab The Input/Output Matrix tab sets the input to output assignments for the DSP4/4. Input/Output Crosspoint - Allows the input/ output crosspoint gain to be set. Each of the 4 rows of 4 crosspoint boxes represent input connections which may be set from inputs to outputs 1-4.
  • Page 13 ADFE Reset - ADFE filters which are currently assigned by the DSP4/4 to feedback frequencies may be reset using the ADFE Reset button. All ADFE filters will be reset when the button is clicked. Some care should be taken when using the reset button that feedback does not occur.
  • Page 14 All Filters shows the composite response of all filters together. Note that when you have a live connection to a DSP4/4, the ADFE notch filter responses will automatically be shown as they are deployed by the system.
  • Page 15 4 In / 4 Out Digital Audio Processor Compressor Tab The Compressor Setup tab allows the setting of the compressor parameters. These parameters include attack time, release time, threshold, and compression ratio. In addition, the gain reduction introduced by the compressor is shown on the gain reduction meter for each output.
  • Page 16 Audio Delay Setup Tab The Audio Delay Setup tab allows the setting of audio delay for each output channel. There is also a distance/time calculator to make conver- sions between audio delay time and distance. Audio Delay Scroll Bar - Allows the audio delay to be set within the range of 0mS to 182.625mS.
  • Page 17 4 In / 4 Out Digital Audio Processor Output Gain Tab The Output Gain tab allows the output gain levels to be set. Output Gain 1 - 4 - Allows the output gain to be set between 0dB and -78dB or “Off”. In addition to the gain scroll bar, 6 “quick gain set”...
  • Page 18 Programmable Input/Output Setup Tab The DSP4/4 has 13 programmable pins on the 15 pin D-Sub connector on the rear panel which allow control and indication of a wide variety of DSP4/4 functions. Pins 1-8 on the rear panel D-Sub connector can be programmed to be either programmable inputs or programmable outputs, while pins 9-13 are only programmable inputs.
  • Page 19 4 In / 4 Out Digital Audio Processor Programmable I/O Status “LED” - Shows the current state of a programmable i/o. The status indicator only has meaning for the following programmable input functions: Analog In: LED ON - Analog In attenuation < 15dB LED OFF - Analog In attenuation >= 15dB Increase In 1dB: LED ON - Contact closure on prog input...
  • Page 20 Controlling Audio Inputs Analog Input Control - Allows one or more input gains to be controlled by an analog voltage on a programmable input pin. Analog input gain control goes from a maximum of 0dB gain to a minimum of 30dB attenuation, plus “Off”. The gain change resolution is 1dB.
  • Page 21 4 In / 4 Out Digital Audio Processor Controlling Audio Outputs Analog Output Control - Allows one or more output gains to be controlled by an analog voltage on a programmable input pin. Analog output gain control goes from a maximum of 0dB gain to a minimum of 30dB attenuation, plus “Off”.
  • Page 22 Recalling Memory Presets Preset Recall - Allows one of the 8 DSP4/4 memory presets to be recalled by a momentary contact closure on a programmable input pin. If you are using two or more programmable inputs for memory recall, you will want to set up and...
  • Page 23 4 In / 4 Out Digital Audio Processor Programmable Output Functions Programmable Output - Sets one of program- mable I/Os on pins 1 through 8 to the Program- mable Output mode. Programmable outputs are used to trigger external devices such as LEDs to indicate the state of an associated programmable input.

  • Page 24: Using The Dsp4/4 To Implement An Electronic Crossover

    USING THE DSP4/4 TO IMPLEMENT AN ELECTRONIC CROSSOVER The DSP4/4 can be used to implement multiway electronic crossovers using some of the user adjustable filters available on each channel. The following note shows how to implement a stereo two-way crossover with 4th order Linkwitz-Riley filters and a crossover frequency of 500Hz.

  • Page 25: Amx Cable Wiring Diagram

    4 In / 4 Out Digital Audio Processor The Filter Setup tab for the left channel high frequency output (output 2) is shown to the right. Note that the first two user adjustable filters are both set to 12db/octave (i.e. 2nd order) high pass filters with a cut off frequency of 500Hz.

  • Page 26: Serial Cable Wiring Diagram

    SERIAL CABLE WIRING DIAGRAM The serial port on the DSP4/4 is a minimal RS-232 implementation. The figure shows the wiring diagram to accommodate interconnection with either a 9 or a 25 pin serial port on a PC or other serial device.

  • Page 27: Serial Port Commands Available

    Crestron Control System to which the DSP4/4 is connected. General Device Commands Get Name String - Gets the DSP4/4’s “name” string. The first data byte is the length of the name string, and the rest of the data bytes are the device name.
  • Page 28 Host receives 1 byte: current memory preset, 0 - 7 representing memory presets 1 - 8. Set Current Memory Preset - Sets the DSP4/4’s current memory preset. The DSP4/4 will immediately set all of its programmable parameters to the new memory preset. The Mode data byte gives the option of memory recall with or without affecting the current settings of the rear panel (i.e.
  • Page 29 AMX or Crestron control systems, because very complex DSP4/4 actions may be triggered by one serial command. The programmable input must first be programmed with the desired function using the Programmable Inputs tab on the DSP4/4 control panel before this command is used. Host sends command - 122 (7A hex)

  • Page 30: Troubleshooting

    1) If you get no sound (and the DSP4/4 power is on), first check the Input Gain tab. If the number in the Gain box is too low, you might want to turn it up a bit. If the Gain box has a red background, it means the input has been muted.

  • Page 31: Specifications

    Types Available: 1st order highpass and lowpass 2nd order highpass, bandpass, and lowpass Default LecNet Address: DSP4/4: 143; DSP4/4 Dual: 143, 144 1st order shelving bass and treble Serial Comm Parameters: RS-232, 9600 baud, 8 data bits, no parity, 2nd order shelving bass and treble...

  • Page 32: Service And Repair

    There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS’ service department is equipped and staffed to quickly repair your equipment. In warranty repairs are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest flat rate plus parts and shipping.
  • Page 33 EN50082-1:1998. A copy of the Declaration of Conformity may be requested from your dealer or by contacting the factory directly: Lectrosonics, Inc. Marketing Department 581 Laser Rd. NE, Rio Rancho, NM 87124 USA tel: 505-892-4501 fax: 505-892-6243 e-mail: marketing@lectrosonics.com Rio Rancho, NM – USA...

  • Page 34: Warranty

    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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