RCF HDL 50-A 4K

ACTIVE THREE-WAY LINE ARRAY MODULE

• 8000 Watt power, 4 x onboard amplifiers
• 143 dB max SPL
• RDNet networked management and monitoring
• 48 kHz, 32 bit DSP processing

The HDL 50-A 4K is a high-output, active 3-way line-array module engineered for large-scale events, delivering exceptional performance in both indoor and outdoor environments. Designed for demanding professional applications, it achieves an impressive maximum sound pressure level of up to 143 dB SPL.

Powered by an integrated four-channel Class-D amplifier rated at 8000 W peak (4000 W RMS), the system provides immense headroom, precision control, and outstanding reliability. The HDL 50-A 4K is equipped with eight premium transducers, ensuring powerful low-frequency impact, articulate midrange response, and crystal-clear high frequencies-ideal for live music, touring, and large-format sound reinforcement.

At the core of its superior coverage is the proprietary 4PATH waveguide, featuring a 90° x 10° dispersion pattern. Combined with a symmetrically designed cabinet, this advanced waveguide delivers consistent sound distribution, excellent throw, and uniform coverage across wide audience areas.

Built to meet the highest professional standards, the HDL 50-A 4K represents a flagship line-array solution from RCF, offering exceptional power, clarity, and control for world-class sound reinforcement systems.

RCF HDL 50-A 4K Features

• 8000 Watt power, 4 x onboard amplifiers
• 143 dB max SPL
• RDNet networked management and monitoring
• 48 kHz, 32 bit DSP processing
• 2 x 12" neodymium woofers
• 4 x 6" neodymium woofer midrange
• 2 x 3" titanium dome neodymium compression drivers
• Remarkably compact and lightweight

The most powerful HDL array ever made by RCF

The 4K amplifier doubles the power of the HDL 50-A to achieve new levels of clarity and absence of distortion. Transducers work at full performance and the SPL output is more than doubled. Furthermore, we improved the power supply section with a tripled current level on fast transients, for a level of detail usually achieved only in high-end studio monitors.

Faster and more powerful

The 4K amplifier is an essential part of HDL 50-A reengineering effort. The 4000 W RMS Class-D power operates at very low impedance producing a quick and detailed transient response, while the high damping factor improves sound quality and detail.

The HDL 50-A 4K power section is tailored to the transducers and the cabinet design to reach excellent efficiency, low distortion and high signal-to-noise ratio. The amplifier module features a solid machined aluminum structure that stabilizes the amplifier during transportation.

The control panel on the back adjusts volume, bypass, delay, presets and advanced functions. The signal input preamplifier features a double opto isolation to avoid noise and ground loops.

DSP Processing

New generation DSP handles processing inside the cabinet and allows for the adjustment of Cluster size and HF projection. The low-latency 32 bits DSP section deploys a remarkable amount of processing power for live performances with straight-forward control and monitoring of individual sections of the module, including the onboard inclinometer and transducer performance via RDNet. An entire set of protections preserve product life and reliability. All settings are controllable by the encoder on the rear of the cabinets or using the integrated RDNet remote management. The easy-to-access control panel allows for simple optimizations of the module.

V-shaped symmetrical design

The symmetrical design of the cabinet produces identical left / right coverage. The component arrangement and the special DSP crossover filtering of the HDL 50-A allow for a constant directivity without spots of break up or attenuation. The V-SHAPED front baffle provides:

• Coplanar midranges and woofers
• Controlled LF dispersion
• Central space to host the HF guide

Neodymium RCF precision transducers

• High frequencies - Two ND 840 large format compression drivers are one of the key advantages of the HDL 50-A. The 3.0" voice coil allows for a crossover point of 800 Hz. The driver itself delivers a sizable portion of vocal range with better intelligibility.
• Mid frequencies - 4 x 2.0" voice coil 6.0" neo midranges - Water resistant fiber doped cone - Polycotton M-roll surround - High power magnetic structure.
• Low frequencies - 2 X 3.0" voice coil neodymium 12" woofers - Water resistant fiber doped cone - Polycotton M-roll surround - Hypervented magnetic structure.

RCF HDL 50-A 4K Specification

ACOUSTICAL SPECIFICATIONS

• Frequency Response: 40 Hz - 20000 Hz
• Max SPL @ 1m: 143 dB
• Horizontal coverage angle: 90°
• Vertical coverage angle: 10°

TRANSDUCERS

• Compression Driver: 2 x 1.4'' neo, 3.0'' v.c
• Midrange: 4 x 6.0'' neo, 2.0'' v.c
• Woofer: 2 x 12'' neo, 3.0'' v.c

INPUT/OUTPUT SECTION

• Input signal: bal/unbal
• Input connectors: XLR, RDNet Ethercon
• Output connectors: XLR, RDNet Ethercon
• Input sensitivity: +4 dBu

PROCESSOR SECTION

• Crossover Frequencies: 200 Hz - 800 Hz
• Protections: Thermal, RMS
• Limiter: Soft Limiter
• Controls: Cluster size, HF correction, RDNET
• RDNet: Onboard

POWER SECTION

• Total Power: 8000 W Peak
• High frequencies: 2000 W Peak
• Mid frequencies: 2000 W Peak
• Low frequencies: 4000 W Peak
• Cooling: Convection
• Connections: Powercon IN/OUT

STANDARD COMPLIANCE

• Safety agency: CE compliant

PHYSICAL SPECIFICATIONS

• Cabinet/Case Material: Baltic birch plywood
• Hardware: Integrated Mechanics
• Handles: 2 side, 2 rear
• Grille: Steel
• Color: Black

SIZE / WEIGHT

• Height: 366 mm / 14.41 inches
• Width: 1171 mm / 46.1 inches
• Depth: 502 mm / 19.76 inches
• Weight: 58.4 kg / 128.75 lbs

SHIPPING INFORMATION

• Package Height: 400 mm / 15.75 inches
• Package Width: 1200 mm / 47.24 inches
• Package Depth: 600 mm / 23.62 inches
• Package Weight: 62.4 kg / 137.57 lbs

  What is the RCF HDL 50-A 4K?
A: The HDL 50-A 4K is a flagship active 3-way line-array module designed for large-scale sound reinforcement in both indoor and outdoor environments. It is built for professional touring, festivals, and high-capacity installations.

  What type of events is the HDL 50-A 4K best suited for?
A: It is ideal for large concerts, outdoor festivals, arenas, stadiums, major corporate events, and houses of worship requiring extremely high output, long throw, and precise coverage.

  How powerful is the built-in amplifier?
A: The system features an integrated four-channel Class-D amplifier delivering 8000 W peak (4000 W RMS), providing massive headroom, efficiency, and reliable performance even under demanding conditions.

  What is the maximum sound pressure level (SPL)?
A: The HDL 50-A 4K delivers an impressive maximum SPL of up to 143 dB, making it suitable for very large audience areas and long-throw applications.

  How many transducers does the HDL 50-A 4K use?
A: It is equipped with eight high-performance transducers, optimized for accurate low-, mid-, and high-frequency reproduction with exceptional clarity and impact.

  What is the 4PATH waveguide?
A: The proprietary 4PATH waveguide is an advanced acoustic design that ensures phase-coherent sound propagation, high efficiency, and extended throw while maintaining consistent coverage.

  What is the coverage pattern of the HDL 50-A 4K?
A: The system offers a 90° horizontal x 10° vertical dispersion pattern, delivering wide, uniform coverage and excellent control in large venues.

  Can the HDL 50-A 4K be used in permanent installations?
A: Absolutely. In addition to touring and rental use, it is well suited for fixed installations in large venues where high output and precise coverage are essential.

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