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4-Channel Power Amplifier with DSP


Item No.: LDDSP45K


  • 4-channel power amplifier with DSP control
  • 4 x 1200 watts @ 4 and 2 ohms, 2 x 2400 watts bridged @ 4 ohms
  • 10 Hz - 22 kHz frequency response with 120 dB dynamic range
  • 24-bit/48kHz DSP with FIR and IIR filters, parametric EQ, crossover, delay, RMS and peak limiters
  • DC, overcurrent, thermal and short circuit protection, soft start, clip and SMPS overload limiters
  • Dual temperature-controlled fans
  • Power factor correction (PFC)
  • Menu driven 4-line display with rotary encoder and security lock
  • Includes control and monitoring software and LD Systems® Loudspeaker Preset Library
  • Description

    The LD Systems® DSP 45 K is a professional 4-channel power amplifier with extensive DSP control. Designed for demanding large-scale sound reinforcement and concert-quality performance, it delivers a massive 1,200 watts per channel and 2 x 2,400 watts bridged. The high-efficiency Class H topology and switch mode power supply with power factor correction (PFC) provide a wide dynamic range and excellent transient response.


    The DSP 45 K features comprehensive protection circuitry including power-up, DC, overcurrent, thermal and short circuit protection plus current and clip limiters to prevent SMPS overload and loudspeaker damage. Together with a pair of temperature controlled fans, they ensure exceptional reliability in the most demanding applications. The 24-bit DSP allows precise control with FIR and IIR filters, parametric EQ, crossover, delay, RMS and peak limiter functions. User configurable loudspeaker presets with password protection enable fast setup


    The DSP 45 K is housed in a dual rack space all-steel chassis and weighs just 7 kg. It provides balanced Neutrik® XLR inputs, speakON® output connectors plus USB and Ethernet ports. The front panel sports a menu driven 4-line display and rotary encoder with push button switch for easy configuration. For optimal speaker performance and safe operation the DSP 45 K comes with an LD Systems® loudspeaker preset library, and the included software enables computer control and monitoring.

  • Specification

    Product type Power Amplifiers
    Type 4-channel
    Rated ouput power (1kHz @ 2 Ohms) 4 x 1200 W
    Rated ouput power (1kHz @ 4 Ohms) 4 x 1200 W
    Rated ouput power (1kHz @ 8 Ohms) 4 x 675 W
    Rated ouput power (1kHz @ 4 Ohms, bridged) 2 x 2400 W
    High Z 70Vrms / 100Vpeak 4 x 1200 W
    High Z 100Vrms / 140Vpeak 2 x 2400 W
    Output circuitry Class H
    Frequency response 10 - 22000 Hz
    Total Harmonic Distortion (THD) < 0.05 % @ 1 kHz
    Signal-to-noise ratio 104 dB
    Protection circuits clip limiter , DC protection , Multiband limiter , over-current , RMS speaker limiter , short circuit , soft start , thermal protection
    Controls Direct access buttons , Exit / lock button , knob , On / off switch
    Indicators LC display
    Line inputs 4
    Line input connectors Neutrik XLR
    Line outputs 4
    Line output connectors Neutrik XLR
    Loudspeaker outputs 4
    Speaker output connections Speakon
    Cooling 2 fans, temperature controlled
    Maximum Ambient Temperature 0 - 40 °C
    Operating voltage 220 V AC - 240 V AC, 50-60 Hz , Switching power supply
    Relative Humidity < 80% (non-condensing)
    Power consumption @ full load 1900 W
    Width 482 mm
    Height 89 mm
    Depth 320 mm
    Weight 7,9 kg
    Features 19" / 2 U , Active Power Factor Correction , DSP controlled
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