Lab.gruppen PLM 20K44 Operation Manual
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Lab.gruppen PLM 20K44 Operation Manual

Plm+ series powered loudspeaker management system
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PLM+ SERIES
Powered Loudspeaker Management™ System
PLM 20K44
PLM 12K44
Incorporating technologies from
Operation Manual

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Summary of Contents for Lab.gruppen PLM 20K44

  • Page 1 PLM+ SERIES Powered Loudspeaker Management™ System PLM 20K44 PLM 12K44 Incorporating technologies from Operation Manual...

  • Page 2: Important Safety Instructions

    1. Important safety instructions 1. Important safety instructions Before using the device, be sure to carefully read the Safety Instructions. Keep this document with the device at all times. Read these instructions. 1.1. Approvals Keep these instructions Heed all warnings. Follow all instructions.
  • Page 3 1. Important safety instructions To completely disconnect this equipment from the AC Radio interference mains, disconnect the power supply cord plug from the AC A sample of this product has been tested and complies with receptacle. The mains plug of the power supply cord shall the limits for the European Electro Magnetic Compatibility remain readily operable.

  • Page 4: Table Of Contents

    Table of Contents Table of Contents 1. Important safety instructions 1.1. Approvals 1.2. Warnings 2. Introduction 2.1. Welcome 2.2. Main Features 2.3. Additional Documentation 3. Installation 3.1. Unpacking 3.2. Mounting 3.3. Cooling 3.4. Operating Voltage 3.5. Grounding 4. Product Overview 4.1.
  • Page 5 Table of Contents 7.5. Meter Button 7.6. Menu Button 7.7. Exit Button 7.8. Dynamic Buttons, Controls and LEDs 7.9. Warning and Fault Indications 7.10. Meter Mode 7.11. Menu Mode 8. Back Panel Interface 8.1. Speaker Outputs 8.2. Analog Inputs 8.3. AES3 Digital I/O 8.4.

  • Page 6: Introduction

    2. Introduction 2.1. Welcome Thank you for choosing the Lab.gruppen PLM+ Series of Powered Loudspeaker Management systems for your sound reinforcement needs. We are confident that you will be pleased with the performance, unique features, configuration flexibility, reliability, and long-term durability offered by this product.
  • Page 7 2. Introduction 2.2.2.2. ISVPL™ The Inter-Sample Voltage Peak Limiter (ISVPL) tailors each power output to the characteristics of the connected load. Please refer to section 5.3.1 for further information. 2.2.2.3. Load Verification & Performance Monitoring A comprehensive set of proprietary DSP-based tools are provided for load verification and real-time performance monitoring.

  • Page 8: Additional Documentation

    Carefully open the shipping carton and check for any damage to the device or the supplied accessories. Every Lab.gruppen product is tested and inspected before leaving the factory and should arrive in perfect condition. If any damage is discovered, please notify the shipping company immediately. Only the consignee may initiate a claim with the carrier or their insurers for damage incurred during shipping.
  • Page 9 3. Installation 3.2.1. Rear Mounting Two rear support brackets along with associated mounting hardware are included with the PLM+, as shown in Figure 3.1; it is recommended that these are used wherever possible. Fit the brackets to the vertical rails at the rear of the rack.

  • Page 10: Cooling

    3. Installation 3.3. Cooling 3.3.1. Overview The PLM+ Series devices use a forced-air cooling system with airflow from front to rear, allowing high continuous power levels without thermal problems. Front-to-rear airflow is preferable as air at the front of a rack is cooler than that at the rear in nearly all situations;...

  • Page 11: Grounding

    3. Installation If the mains plug (AC plug) fitted to the mains cable (AC cord) is not appropriate for your country, it can be removed and a locally-sourced one fitted instead, observing the color coding in the table below: powerCON pin Brown Blue Green/Yellow...

  • Page 12: Product Overview

    4. Product Overview 4. Product Overview 4.1. Front Panel Overview The front panel presents the following amplifier status indicators: The front panel controls are clustered around a daylight readable LCD , allowing adjustment and monitoring of the majority parameters and meters. The two clusters of controls on either side of the LCD include five dedicated function buttons , eight dynamic function buttons with embedded LEDs and a rotary data...
  • Page 13 4. Product Overview Mute Enable – Select MUTE ENABLE to allow the dynamic function buttons to operate as mute controls for the Module inputs and power output channels. The MUTE ENABLE button flashes when the mode is selected; a subsequent press deselects this mode. If left activated, MUTE ENABLE mode will automatically disable two minutes after the last mute action.

  • Page 14: Rear Panel

    4. Product Overview 4.2. Rear panel INPUT 1-2 INPUT 3-4 1Gbps PRIM 1Gbps 100-240V 2400-2950W SPEAKER OUTPUTS INPUT 1 INPUT 2 INPUT 3 INPUT 4 50-60Hz LINK LINK PLM 2K44 CH 1 CH 3 CH 2 CH 4 PIN 1: SCRN 2: POS 3: NEG ANALOG WITH LOAT AES/EBU...
  • Page 15 4. Product Overview Primary Network Connector – The primary Neutrik RJ45 etherCON® connection provides integration into an Ethernet control network which may include other Lake Processors and the Lake Controller software. Network connection permits full control of all functions along with real-time metering from a remote position. This device supports the Dante audio networking protocol, which allows transmission of multichannel, high-definition digital audio over the same Ethernet connection.

  • Page 16: Operation And Performance

    Class D topologies to the sonic purity of Class A/B designs. The primary benefit is that Lab.gruppen’s Class TD works perfectly under all load conditions. The output maintains its flat frequency response even into complex loads with very low nominal impedances. Reliability is very high, and there is no interference with nearby RF equipment.
  • Page 17 “Actual ISVPL” values in the Events & Control section. Please find more information about this in documentation supplied with the CAFÉ software download. RPM limitations: PLM 20K44 allows all four channels to deliver Channel Max output voltage of 194V. PLM 12K44 allows two channels to deliver Channel Max output voltage of 194V.

  • Page 18: Amplifier And Load Protection Systems

    5. Operation and performance CAFÉ with ESP: CAFÉ (Configuring Amplifiers For the Environment) is a dedicated software application for Windows and OSX that provides tools for system planning, specification and commissioning. CAFÉ incorporates the Equipment Specification Predictor, a software module that examines SPL and speaker requirements for a project and generates requirements for output power on an amplifier and system level.
  • Page 19 5. Operation and performance Table 5.3 shows the theoretical maximum output power for a given load impedance and ISVPL setting. Note: An ISVPL-to-load calculator that will assist in generating the appropriate ISVPL setting for a desired power load is available at www.labgruppen.com/plm. The ratings shown in the table below are limited by the CPL (Current Peak Limiter) functions, not by ISVPL settings, due to power output channel current capacity.
  • Page 20 5. Operation and performance This condition indicates an attempt to draw excessive current at the output. The output is attenuated until the output current falls below the maximum current rating. Limiting is performed by the ISVPL limiter in conjunction with the selected ISVPL profile. Please refer to the Technical Specifications in Section 11 for further details regarding ratings.
  • Page 21 5. Operation and performance 5.3.5. Under Voltage Limiter (UVL™) PLM+ devices are equipped with an under voltage limiter. With mulitple powerful devices on a mains distribution line, heavy current loads risk the reduction of voltage below that required for devices to function. The UVL reduces the mains current draw when voltage drop below 80 V.
  • Page 22 5. Operation and performance 5.3.8.2. Power Output Channels A power output channel temperature warning or fault is indicated in one of the front panels LEDs (in the right-hand soft function buttons). • A warning is indicated by a static yellow LED and adjacent warning message: TEMP WARN:CH •...
  • Page 23 5. Operation and performance This protection system recognizes only continuous VHF signals at high levels that will not appear in speech or music. Any such content can therefore be considered as a fault condition. VHF protection is essential to avoid damage to HF drivers.

  • Page 24: Power Supply

    5. Operation and performance 5.3.11. Short Circuit Protection A low impedance or short circuit at the power output terminals is detected when the output current is high (Current Peak Limiter is active) and, simultaneously, the peak output voltage is below a predetermined threshold. When this situation occurs, the output stage is muted to protect it from damage.

  • Page 25: Signal Flow And Lake® Processing

    6. Signal Flow and Lake® Processing 6. Signal Flow and Lake® Processing 6.1. Signal Flow The figures below depict the audio signal flow for a PLM+ Series device. It is worth noting that this sophisticated device provides seven points in the signal chain where the signal level can be adjusted, muted or disconnected. The blue sections represent Frame data, and the red sections represent Module data - please refer to the Lake Controller Operation Manual for further information.

  • Page 26: Lake Processing And Control

    6. Signal Flow and Lake® Processing 6.2.1. Power Output Section: Limiting and Sensitivity The Current Peak Limiter (CPL) dynamically limits the drive to the power stage based on three parameters: sensed output current level, feedback from the output stage, and sensed voltage clip from the ISVPL. This ensures that power output is maintained within the design limits of the PLM+.

  • Page 27: Modules And Frames

    6. Signal Flow and Lake® Processing Notes 6.4. Modules and Frames 6.4.1. Overview A Frame represents one physical Lake Processor device (e.g. PLM 12K44). A maximum of four Modules are contained within each Frame; these are referred to as Module A, B, C and D. The number of Modules shown in a given Frame is dependent upon the signal processing configuration of that Frame.

  • Page 28: Files And Presets

    6. Signal Flow and Lake® Processing 6.6. Files and Presets The Lake system provides various methods for storing and recalling Module, Frame, or system-wide data. An overview is provided below; for further information please refer to the Lake Controller Operation Manual. 6.6.1.

  • Page 29: Front Panel Interface

    7. Front Panel Interface 7. Front Panel Interface An overview of the front panel interface is provided in section 4.1. This chapter describes each cluster of controls as shown in the diagram below. 7.1. Overview The front panel interface is framed by two sturdy cast aluminium handles and metal grill protecting the air intake and dust filters .

  • Page 30: Front Panel Key Lock

    7. Front Panel Interface 7.1.3. Selecting a Module in the Lake Controller software via the Front Panel It is sometimes useful to identify which Module icon/s in the Lake Controller software are associated with a particular hardware Frame. To highlight the module in the Lake Controller software: 1.

  • Page 31: Mute Enable Button

    7. Front Panel Interface 7.4. Mute Enable Button The dynamic function buttons to the immediate left and right of the LCD are used as MUTE buttons only when the MUTE ENABLE button is activated (flashing). When MUTE ENABLE is activated the MUTE ENABLE button will flash and the four buttons on the left act as Module or Input Router mute controls (depending on active view) and the four buttons on the right enable muting/unmuting of the Amplifier Channel (power outputs).

  • Page 32: Dynamic Buttons, Controls And Leds

    7. Front Panel Interface 7.8. Dynamic Buttons, Controls and LEDs Figure 7.3: LCD with Dynamic Buttons, Controls and LEDs 7.8.1. Communication LED This bright white LED signifies selection in the Lake Controller, or Controller communication providing visual confirmation of: 1. Network communication between the Lake Controller and the Lake Processor (Flashing LED). 2.
  • Page 33 7. Front Panel Interface 7.8.3. Rotary Encoder The rotary encoder is used to adjust parameters in conjunction with the selection made via the dynamic function buttons and LCD menus. The ring around the rotary encoder illuminates when a selected parameter is available for adjustment.
  • Page 34 7. Front Panel Interface 7.8.4.1. Mute Functions The PLM+ provides mute functions at several different points in its audio chain. Please refer to section 6.1 for further information. The four types of mute are: 1. PLM+ Input Router Mute 2. Module Input Mute 3.
  • Page 35 7. Front Panel Interface Note: Fault condition LED indications take priority over mute status indications. If a fault condition occurs, the LED will indicate the fault by flashing and will note the mute status. When a Frame fault is active the audio on all channels is muted. Module Input Mutes may also be controlled in Menu Mode.
  • Page 36 7. Front Panel Interface 7.8.5. LED Fault, Warning and Clip Indication A tricolor LED is embedded inside each of the eight dynamic function buttons. These convey a variety of status indications including faults and warnings, signal clip indications, Module input mute, Module output mute and Power Output mute.

  • Page 37: Warning And Fault Indications

    7. Front Panel Interface 7.8.5.2. Warning or Fault Indications If certain parameters within the PLM+ approach or exceed preset limits, a warning condition or fault condition may arise. One or more LEDs provide a visual indication of the problem, along with an on-screen description of the condition displayed adjacent to the LED/s.
  • Page 38 7. Front Panel Interface On Screen Warning Type LED No. Event Log Text Warning Text Amp Ch Mute Channel AMP CH. MUTE Amp Channel Mute Amp Temp Fault Channel TEMP FLT:CH Temp Fault: Amp Channel Analog Input Fault Frame ANALOG IN FAULT Frame Fault: Analog Input Check AC Mains Frame...

  • Page 39: Meter Mode

    7. Front Panel Interface 7.10. Meter Mode 7.10.1. Home View The default view when powering on the device is Meter Mode > Home View as shown in Figure 7.7. Figure 7.7: Meter Mode > Home View Home View provides a summary of Module I/O gain level and limiter gain reduction, along with frame, module and channel labeling information.
  • Page 40 7. Front Panel Interface Note: Output limiter (gain reduction) meters take into account the sum of PLM+ ISVPL and Lake LimiterMax. The icons in the center of the LCD indicate the amplifier channel to which each module output is routed. When two amplifier channels are Bridged, both channels will be displayed.
  • Page 41 7. Front Panel Interface LoadPilot Status: 1. High Freq Pilot tone Enabled/Disabled, 2. Low Freq Pilot tone Enabled/Disabled, Status LoadPilot Status: 1. High Freq Pilot tone Enabled/Disabled, 2. Low Freq Pilot tone Enabled/Disabled, Status LoadPilot Status: 1. High Freq Pilot tone Enabled/Disabled, 2. Low Freq Pilot tone Enabled/Disabled, Status Current View title &...
  • Page 42 7. Front Panel Interface 7.10.4. Input Meters View Input View enables inspection of the source selected to each input router; input signal level before the input mixer (i.e. prior to the Home View Module input meters); Module Input Mixer Routing; as well as Input Connection status. Figure 7.11: Meter Mode >...

  • Page 43: Menu Mode

    7. Front Panel Interface Output 1: Output Label - Output Gain Meter - Lx: Sum of Lake MAX-Peak and MAX-RMS gain reduction Output 2: Output Label - Output Gain Meter - Lx: Sum of Lake MAX-Peak and MAX-RMS gain reduction Output 3: Output Label - Output Gain Meter - Lx: Sum of Lake MAX-Peak and MAX-RMS gain reduction Output 4: Output Label - Output Gain Meter - Lx: Sum of Lake MAX-Peak and MAX-RMS gain reduction Current View title &...
  • Page 44 7. Front Panel Interface 7.11.1.1. Parameters with Individual Values and Group Totals The following parameters display two values: • MODULE > GAIN • MODULE > DELAY • MODULE > LIMITERS > MAXRMS LEVEL • MODULE > LIMITERS > MAXPEAK LEVEL The Module parameter can be adjusted using the rotary encoder.
  • Page 45 7. Front Panel Interface • LOAD MONITOR (See section 7.11.8) • Configure No. of Cabinets in Parallel • LoadSmart Verification • Estimated No. of Cabinets 7.11.2. Module Submenu Only module output channels for routed Power channels are displayed. This applies to all module output configurations described below.
  • Page 46 7. Front Panel Interface 7.11.2.2. Gain MENU > MODULE > GAIN Figure 7.16: Module Gain Edit Screen Press the illuminated button next to the module input/s and/or output/s for adjustment, and use the rotary encoder to change the value(s). Multiple gain values may be adjusted simultaneously in 0.1 dB increments, subject to defined level limits.
  • Page 47 7. Front Panel Interface 7.11.2.5. Amp Gain MENU > MODULE > AMP GAIN By default, all outputs are selected; use the rotary encoder to change the gain of all power outputs or press the associated output button to deselect one or more outputs. Amp Gain adjusts the gain of the PLM+’s power output stage for each output channel.
  • Page 48 7. Front Panel Interface MaxRMS Level (MaxRMSLvl) This sets the maximum RMS signal level at the Module outputs. It is adjustable from -30 dBu to +30 dBu in 0.1 dB increments, subject to user-defined level limits. The Group total is displayed (in brackets) for each channel. MaxRMS Corner (MaxRMSCor) A soft-knee or hard-knee corner may be applied to the RMS Limiter.
  • Page 49 7. Front Panel Interface 7.11.3. I/O Configuration MENU > I/O CONFIG Figure 7.17: I/O Configuration Sub Menu This menu provides configuration options for input routing, along with settings for AES Termination and Iso-Float as described in the following sections. 7.11.3.1. Input Router Configuration MENU >...
  • Page 50 7. Front Panel Interface With a router selected on the front panel, press the middle button on the left of the LCD to activate this parameter for editing. Use the illuminated rotary encoder to scroll through the following options: • Auto Select (default) •...
  • Page 51 7. Front Panel Interface The PLM+ device at the end of a distribution line should be set to TERMINATED; all other PLM+ devices should be set to UNTERMINATED. If an AES3 distribution amplifier (DA) is being used to distribute the digital audio signals, with one DA output per processor, then all terminations should be on.
  • Page 52 7. Front Panel Interface Toggle the Source from which you want to route the channels (Module, Analog, AES) Toggle up among the available source channels Toggle down among the available source channels Unused Unused Toggle left among the available outputs Toggle right among the available outputs Disconnect all Dante assignments Turn Right to Route / Turn Left to Un-route...
  • Page 53 7. Front Panel Interface 7.11.5.1. Frame Info MENU > FRAME > FRAME INFO Frame Info provides information about the device settings and configuration. All data in this front panel menu is read-only; some parameters are fixed, and some can be changed only via the Lake Controller software. Firmware Version (FW Version) The firmware version numbers are displayed on left side of screen.
  • Page 54 7. Front Panel Interface 7.11.5.3. Breaker Emulation Limiter MENU > FRAME > BEL CONF The Breaker Emulation Limiter (BEL) provides Ampere selection (5-32 A) and breaker type selection (CONSERVATIVE, FAST and UNIVERSAL). Select by pressing the adjacent button then use the rotary encoder to change the parameter.
  • Page 55 7. Front Panel Interface 7.11.6. Front Panel Display Controls MENU > FRAME > FRONT Contrast To adjust the front panel LCD contrast, select this option then use the rotary encoder to change the value. Dimming To adjust the front panel LCD & LED brightness, select this option then use the rotary encoder to change the value. Channel Order To adjust the order in which both inputs and outputs are displayed on the front panel in all views, select this option then use the rotary encoder to change the value between TOP-DOWN (default) and BOTTOM-UP.
  • Page 56 7. Front Panel Interface 7.11.8.1. Configure # of Cabinets in Parallel This option allows selection of the number of speaker cabinets connected to each PLM+ output channel. Select individual or multiple outputs and use the rotary encoder to set the value from 1 to 4. This value is used by LoadSmart to confirm the correct connection and status of the speakers connected to each PLM+ channel.

  • Page 57: Back Panel Interface

    8. Back Panel Interface 8. Back Panel Interface An overview of the back panel interface is provided in section 4.2. This chapter describes each cluster of connections as shown in Figure 8.1. INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 1-2 INPUT 3-4 1Gbps...
  • Page 58 8. Back Panel Interface 8.1.2. speakON Connectors On both PLM+ models, the power outputs are simultaneously available on a single 8-pole speakON connector, and on two 4-pole speakON connectors. The two 4-pole connectors carry the outputs of channels 1 & 2 and 3 & 4 respectively.
  • Page 59 8. Back Panel Interface PLM+ Output PLM+ Output PLM+ Output Channels 1 & 2 Channels 1 - 4 Channels 3 & 4 Figure 8.5: speakON NL4/NL8 Configuration 8.1.3. Binding Post Connectors Binding post versions of the PLM+ are fitted with four pairs of black and red 4 mm binding posts. SPEAKER OUTPUTS CH 1 CH 3...

  • Page 60: Analog Inputs

    8. Back Panel Interface Connect the ‘+’ loudspeaker terminals to the red binding posts and the ‘ – ‘ terminals to the black binding posts. There are three methods of connecting speaker cables to the binding posts. 1. Solder 4 mm banana-plugs to the ends of the speaker wires and plug into the center of the turrets. 2.
  • Page 61 8. Back Panel Interface 8.2.3. Unbalanced Operation Balanced connections are recommended where possible. However, if it is necessary to drive the device from equipment with an unbalanced output, wire the inputs as shown in Figure 8.10. COLD COLD SCRN SCRN Unbalanced Output Balanced Input (Typically phono)

  • Page 62: Aes3 Digital I/O

    8. Back Panel Interface 8.3. AES3 Digital I/O 8.3.1. AES3 XLR Connector AES3 digital audio input is via two XLR3F connectors. Connectors are provided for Inputs 1 & 2 and Inputs 3 & 4. Wiring of this connector follows the same standard as for analog XLR connections as shown section 8.2.2. The AES3 signal format carries two channels of audio and associated data on a single cable/connector.
  • Page 63 8. Back Panel Interface Pin No. Color Brown Brown + White Green Blue + White Blue Green + White Orange Orange + White Table 8.14: RJ45 Wiring & Pin Out Description Figure 8.15: RJ45 Wiring & Pin Out Diagram When the device is connected to an active network, the yellow LINK LED illuminates above the connector in use. Data activity on the network is indicated by illumination of the green ACT LED.

  • Page 64: Power Inlet

    8. Back Panel Interface 8.5. Power Inlet 8.5.1 Power Connector A Neutrik NAC3 Series powerCON connector rated at 32 A is fitted to the rear of the PLM+ for AC mains input. The power cable (AC cord) supplied with the PLM+ has the mating connector ready-fitted, but may require a mains (AC) plug specific to your country to be fitted to the other end.

  • Page 65: Appendix

    9. Appendix 9. Appendix 9.1. Faults and Warnings Overview Category/Type Name On screen text Description Action FRAME Check network cabling/ Frame unable to find Lake controller Lake Controller offline CTRL OFFLINE network if controller Warning on the network expected on the network Frame not able to lock to Check AES sender and AES clock slipping...
  • Page 66 9. Appendix Category/Type Name On screen text Description Action The Under Voltage limiter is active as the mains supply is approaching the lower Increase mains distribution Under Voltage Limit UVL ACTIVE end of the device´s operational voltage. stiffness or reduce output Warning Output power is decreased to ensure power to avoid limiting...
  • Page 67 9. Appendix Category/Type Name On screen text Description Action LoadSmart detected more speakers Check load and More speakers OVR SPKR COUNT Warning than expected cabling or fingerprint Check load and Uncertain about load UNCERTAIN LOAD LoadSmart uncertain about load Warning cabling or fingerprint Perform LoadSmart Load not verified...

  • Page 68: Maintenance

    9. Appendix 9.2. Maintenance During normal operation this devices provides trouble-free service. If the LCD or front panel display requires cleaning, use a soft cloth only; do not use solvent cleaners. The dust filters on both sides of the front panel, behind the grilles, should occasionally be removed and cleaned to ensure maximum airflow through the device.
  • Page 69 0 dB Polarity: Positive (In phase) Mutes: Unmuted Load Model: No Load Model Breaker Emulation Limiter: PLM 20K44 - 32A PLM 12K44 - 25A IP Configuration: Auto Zero Conf. (Auto IP) Dual Redundancy: Disabled Dante Slave Only: Enabled PLM+ SERIES Operation Manual rev 1.0.0...

  • Page 70: Current Draw And Thermal Dissipation Specifications

    9. Appendix 9.4. Current Draw and Thermal Dissipation Specifications The tables in this section provide measured current consumption and calculated heat dissipation for five different operating conditions for each PLM+ Series device. 1. Standby Mode 2. Power On (Idle - No Signal) 3.
  • Page 71 9. Appendix PLM 20K44 Rated power Power Level Load Line Current Measured Power (W) Thermal Dissipation per channel Factor Dissipated BTU/hr kCal/hr Mains Voltage 100 VAC, 30 A 0.33 51.8 58.006 14.627 Standby Power on, Idling 2.43 96.8 801.853 202.199 16 Ω...

  • Page 72: Glossary Of Terms, Acronyms And Abbreviations

    Iso-Float is Lake’s proprietary method of electronic balancing, which provides a particularly high level of isolation and immunity from ground loops. ISVPL is an abbreviation for Inter-Sample Voltage Peak Limiter, a proprietary Lab.gruppen technique for ensuring that voltage at the output terminals of a PLM+ ISVPL does not exceed a pre-determined level.
  • Page 73 Short Circuit Protection A Lab.gruppen proprietary protective circuit designed to mute a channel when a short circuit is detected at its output terminals to prevent damage to the device. Once activated, SpeakerSafe constantly monitors the voltage and current at the PLM+’s outputs. Using Fingerprint data, the software then calculates parameters SpeakerSafe such as voice coil and magnet temperatures, providing the operator with real-time performance monitoring.

  • Page 74: Application Guide

    10. Application Guide 10. Application Guide This chapter describes the practical application and use of PLM+ Series devices. 10.1. Rack I/O Panels For fast and simple system connection, pre-wired racks using connection panels can be used. With an I/O connector panel fitted to the front of the rack, all audio, loudspeaker, network and power cables can be plugged in at one position, without requiring rear panel access.

  • Page 75: Gain Structure

    10. Application Guide 10.2.2. Six PLM+ Series Devices with 100-120 V Mains Supply If the mains supply is 115 V and the system requirement is 6 PLM+s, then the mains capacity would need to be able to supply two 3 x 30 A circuits. There are two methods of achieving this: 1.
  • Page 76 10. Application Guide 10.3.3. Module Input Gain Input Gain is used to adjust the level between different speaker cabinets in the system. This gain can remain at 0.00 dB unless a lower level is required for the cabinet/s driven by this Module. To adjust, navigate to MODULES >...

  • Page 77: Gain / Level Optimization

    10. Application Guide 10.4. Gain / Level Optimization 10.4.1. Maximize Volume Capability To maximize the volume capability of the device, ensure there is sufficient headroom in the signal path to avoid clipping before the limiters engage. It must be possible to achieve enough gain through the device to engage the limiters and realize a high average SPL.
  • Page 78 10. Application Guide Figure 10.3 illustrates how to achieve the lowest possible output noise, although this is not a recommended configuration. • Input Clip: 0 dBFS • Amp Gain: 22 dB • SNR: 114.8 dB • Absolute Noise Floor: -71.9 dBu 100,0 50,0 Clip...
  • Page 79 10. Application Guide Figure 10.5 illustrates how to minimize absolute noise while achieving full power. In this illustration it can be seen that there is no available headroom. • Input Clip: 12 dBu • Amp Gain: 30.9 dB • SNR: 111.3 dB •...

  • Page 80: Speaker Configurations

    10. Application Guide 10.5. Speaker Configurations Connecting two speakers in parallel to a PLM+ power output presents a load to the amplifier which is half the impedance of that presented by one speaker. Therefore, the current that two speakers will attempt to draw from the output stage is double that for one speaker, and this higher current may be sufficient to cause the Current Peak Limiter to become active.
  • Page 81 10. Application Guide The data format allows for auxiliary data which can be used for information on signal characteristics as well as the sampled audio data. The physical interconnection, as defined by IEC 60958 Type I, specifies three-conductor 110-ohm twisted pair cabling terminated by an XLR connector. Please refer to section 8.3 for wiring details. AES3 provides for multiple sampling rates and resolutions of up to 24 bits;...
  • Page 82 10. Application Guide 10.6.3.3. Cable Types and Distance Limitations All digital connections should be made with 100 ohm balanced cables wired according to the AES3 standard (see Section 8.2.2). Although standard analog microphone cabling may function in limited circumstances, the potential for problems is greatly increased.

  • Page 83: Digital Clock Configuration

    10. Application Guide 10.6.5. Additional Reference Material Complete technical information on the AES/EBU (AES3) standard can be downloaded from the AES web site at http://www.aes.org/publications/standards/. 10.7. Digital Clock Configuration 10.7.1. Digital Clock Overview In order to provide a flexible and robust audio processing system, the device is equipped with a configurable digital clocking system.
  • Page 84 10. Application Guide 10.7.2. Clock Source Priorities There are two options for clock source configuration: Manual Configuration or Automatic Detection. For Manual Configuration, the selected internal or external clock source remains fixed regardless of whether a compatible clock signal is preset. For Automatic Detection, the most appropriate clock matching the selected base-rate is automatically selected according to the following priorities.

  • Page 85: Technical Specifications

    11. Technical Specifications 11. Technical Specifications PLM 12K44 PLM 20K44 General Processing / Network Lake / Dante Lake / Dante Numbers of amplifier channels Total burst power all channels (share among channels with RPM) 12000 W 20000 W Max. Output Power (all ch.’s driven)
  • Page 86 Intercooler, Class TD and Lake are national and/or international registered trademarks of Lab.gruppen AB. PLM, Powered Loudspeaker Management, R.SMPS, LoadLibrary, LoadSmart, SpeakerSafe, BEL, UVL and ISVPL are trademarks of Lab.gruppen AB. Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. Contour, Mesa Quad EQ, Mesa Parametric EQ, Raised Cosine Equalization, LimiterMax and Iso-Float are trademarks of Dolby Laboratories.

  • Page 87: Warranty And Support

    Lab.gruppen dealer. If the product fails to perform as specified during the warranty period, Lab.gruppen will undertake to repair, or at its option, replace this product at no charge to its owner, provided the unit is returned undamaged, shipping prepaid, to an authorized service facility or to the factory.
  • Page 88 12. Warranty and Support 12.3.2. Factory Service In the event a Lab.gruppen product requires factory service, you may contact Lab.gruppen’s service department for return instructions and a Return Authorization number. Please note for product return: 1. Use the original packing.
  • Page 89 Notes Notes PLM+ SERIES Operation Manual rev 1.0.0...
  • Page 90 Notes Notes PLM+ SERIES Operation Manual rev 1.0.0...
  • Page 91 Notes Notes PLM+ SERIES Operation Manual rev 1.0.0...
  • Page 92 Intercooler, Class TD and Lake are national and/or international registered trademarks of Lab.gruppen AB. PLM+, Powered Loudspeaker Management, R.SMPS, LoadLibrary, LoadSmart, SpeakerSafe, ISVPL, BEL, UVL and CAL are trademarks of Lab.gruppen AB. Dolby is a registered trademark of Dolby Laboratories. Raised Cosine Equalization, LimiterMax and Iso-Float are trademarks of Dolby Laboratories.

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Plm 12k44

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