LD Systems DSP 45 K 4-Channel Power Amplifier with DSP 4 x 1200 watts @ 4ohm

• 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.

The DPA series amplifiers are digital power amplifiers designed to meet the specialized needs of sound contractors for Multi-Zone distributed speaker systems. They are designed in six different models of Class D power amplifiers, divided in three different architectures to meet the requirements for all kinds of applications.

They combine the best of all features in one single series of amplifiers, providing an outstanding sound quality with all the known advantages of Class D Amplifiers. Such as the excellent efficiency and very low heat dissipation. And due to the complete passively cooled entity only a minimal of maintenance is needed, while ensuring maximum reliability.

The small size of a single rack space make them very interesting for fixed rack mount as well as mobile applications.

The DPA74 is built as multi channel power amplifier with four individual controllable channels containing various specific features and advanced protection circuitry which protects against DC malfunctioning, short circuit, overheating and overload.

The signal input connections are accommodated with balanced XLR connectors. The operation mode can be selected between Stereo mode, Bridge mode and Parallel mode. The output connections are accommodated with Euro-Terminal blocks.

• Model Name / Type: DPA74 / Digital Amplifier
• 8 ohms: 4 x 50 W
• 4 ohms: 4 x 75 W
• 8 ohms Bridge: 2 x 150 W
• THD+N:
• Signal / Noise: > 100 dB
• Frequency Response: 20 Hz - 20kHz
• Power Supply: 240 V AC / 50 - 60 Hz
• Dimensions (W x H x D): 483 x 44 x 300 mm

mplifier Gain 32 dB (Lo-Z), 33 dB (70V), 36 dB (100V)
Analog Inputs 4, electronically balanced, Phoenix-type
Audio Network No
CAN Bus Interface Yes (With Optional RCM-810 Card)
Continuous Rated Power
(1 kHz, THD 1%) 100v 500 Watts
Continuous Rated Power
(1 kHz, THD 1%) 2Ω 500 Watts
Continuous Rated Power
(1 kHz, THD 1%) 4Ω 500 Watts
Continuous Rated Power
(1 kHz, THD 1%) 70v 500 Watts
Continuous Rated Power
(1 kHz, THD 1%) 8Ω 250 Watts
Continuous Rated Power
(20-20 kHz, THD Continuous Rated Power
(20-20 kHz, THD Continuous Rated Power
(20-20 kHz, THD Continuous Rated Power
(20-20 kHz, THD Cooling Front-to-Rear, continuously variable fans
DIM 30 0.02 %
Electronics Type Amplifier
Frequency Response 15 Hz-30 kHz
Input Impedance (Balanced) 20 kΩ
Input Sensitivity 0 dBu (.775V)-2 Ω, +3 dBu (1.1V)-4/8 Ω, +6 dBu (1.55) 70V/100V
Intermodulation Distortion (SMPTE) 0.05 %
Mains Voltage 220 - 240 V, 50 - 60 Hz or 120 V, 50 - 60 Hz, 50 - 60 Hz
Maximum Bridged Output 4Ω 1000 Watts
Maximum Bridged Output 8Ω 1000 Watts
Network Control (IRIS-Net) Optional
Slew Rate 28 V/µs
Total Harmonic Distortion 0.05 %
Variable Load Drive (VLD) Yes
Height 2RU 88.1 mm (3.47“)
Width 481 mm (18.94“)
Depth 421.5 mm (16.59“)
Weight Net 11.1 kg (24.47 lbs)

• Eight and four channel models with 300W and 150W per channel • Minimal footprint and mass arround 200mm depth and 6 Kg • Optional Add-on card to interface with third party alarm systems with GPIO connections • FCM™ Faulty Channel Management system to avoid entire device shutdown • State-of-the-art layout for maximum performance and reliability • Highly oversized thermal dissipation design for maximum reliability • Superb distortion and noise figures • All channels bridgeable by pairs • Selectable gain in four channel groups (26, 32 and 38dB) • Subsonic filter per channel (35Hz user selectable) • Temperature and signal dependant, intelligent cooling system for minimal noise • Optimal heat extraction due to the air tunneled enclosure and insulator-less power device attachment to the heatsink • Direct connector-less output for maximum quality loudspeaker control • High grade engineering inside with the latest SMD technology • Balanced Inputs with 0.1% tolerance resistors for a precise noise rejection • Critical electronic and mechanical parts selection • Innovative protection systems, FCM™ Faulty Channel Management and SSP™ SOA Sentry Protection • Detented and optionally tamper-proof volume potentiometers • Hi efficiency, two steps Class H Audio topology • Protection, Signal and Clip indicators per channel • Power On and Standby general indicators • Extremely compact, fully featured QuantaPulse Power supply • Low current consumption and heat generation allowing less demanding conditions for multiple amplifier installations • Factory preset worldwide mains voltage power supply • Laser cut four milimeters aluminium front panel • Rugged 2U steel chasis