LD Systems DSP 45 K

LD Systems DSP 45 K

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4-Channel Power Amplifier with DSP

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  • 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

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.

Product type
Power Amplifiers


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

Rated ouput power (1kHz @ 8 Ohms, bridged)
2 x 1200 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

Direct access buttons , Exit / lock button , knob , On / off switch

LC display

Line inputs

Line input connectors
Neutrik XLR

Line outputs

Line output connectors
Neutrik XLR

Loudspeaker outputs

Speaker output connections

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

482 mm

89 mm

320 mm

7,9 kg

19″ / 2 U , Active Power Factor Correction , DSP controlled


LD Systems

About LD Systems

Pro Audio in Motion

Designed in Germany, heard around the world!

Within just a decade LD Systems® has become a major pro audio brand with an extensive range of product lines. The expert LD engineering team and highly motivated personnel are continuously engaged in creating advanced, state-of-the-art audio equipment that provides superior sonic performance and exceptional value. Designed in Germany, LD Systems® professional audio products deliver world-class sound around the globe.

LD Systems® is a registered brand of the Adam Hall Group with headquarters near Frankfurt am Main, Germany. Established more than 35 years ago, the company has built a solid reputation for quality products, outstanding customer service and being a dependable partner in the pro audio, events and MI industries. The Adam Hall® Group's rigorous standards and dedication to innovation are reflected in each and every LD Systems® pro audio product.



Paino 2.4 kg
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