• 2200W Two Way Amplifier
  • 135 dB Max SPL
  • 48 kHz, 32 bit DSP processing
  • RDNet Networked Management
  • 2 x 8” Neodymium Woofers, 2.5” voice coil
  • 1.4” Titanium Compression Driver, 3.0” voice coil
  • Exclusive FiRPHASE technology on-board
  • 750 Hz Crossover Point

The RCF HDL 28-A is a compact bi-amped 2-way active touring system for a wide range of applications, both indoors and outdoors, with an emphasis on vocal intelligibility. It features two 8-inch woofers and an impressive 3-inch titanium compression driver. The time coherent waveguide is the result of in-depth research and design. Following the HDL 30-A philosophy, the HDL 28-A shares the composite material cabinet, the zero-degree phase and ultra-linear amplitude response. The built-in 2200 watt class-D amplifier delivers excellent playback clarity and up to 135 decibels SPL max. The RCF HDL28-A features state of the art RCF transducers with lightweight neodymium magnets. Considering its acoustical power, it has a remarkably low weight for easy handling and flying. The HDL 36-AS is the ideal flyable bass complement for the HDL 28-A array system.

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Networked control and much more
RDNet is a robust management network and control platform for small, medium and large arena-sized sound systems, as well as complex and extended installations. Based on a proprietary network protocol, RDNet provides intuitive control and monitoring of every connected device/object in the RCF audio system. Each device has DSP to address specific presets or modifications of parameters to single or groups of objects. A network user can change level, delay, EQ (linear phase FiR as well) and other settings, including advanced subwoofer configurations. RDNet is not only designed for loudspeakers—you can control parameters and routing of multiple RCF devices, such as digital matrixes or amplifiers.

The acoustic beauty of the symmetry

The symmetrical design of the cabinet produces identical left and right coverage. The component positioning and special DSP crossover filtering of the HDL 28-A take care of the constant directivity without spots of break up or attenuation. The specially-designed front baffle provides coplanar woofers, controlled LF dispersion and a central space to host the 4PATH waveguide. The heavy-duty front grille is powder coated. A special transparent-to-sound foam backing inside helps to further protect the transducers from dust. For weatherproof capabilities, a rain cover is available.
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Powerful class D amplifiers

RCF's Class-D power amplifier technology packs huge performance operating with high efficiency into a lightweight solution. HDL amplifiers deliver a ultra-fast attack, realistic transient response, and impressive audio performance. The amplifier features a solid machined aluminium structure which not only stabilises the amplifier during transportation but also helps the fan-less heat dissipation. All the HDL amplifiers present SMPS power supply section to produce maximum output and minimum weight.

First class transducers

The RCF HDL 28-A features state-of-the-art RCF transducers with neodymium magnets. RCF’s experienced engineering teams have specially developed and matched each component — starting from the power supply through the input board to the amplifiers and transducers right up to the complete HDL 28-A System.
High frequencies
  • High-performance RCF ND840
  • 3.0-inch diaphragm titanium compression driver
  • 1.4-inch exit throat
  • 750 Hz Crossover Point
Low frequencies
  • 2 X 2.5”voice coil neodymium 8” woofers
  • Linear low frequencies handling down to 65 Hz
  • Water resistant fibre doped cone
  • Polycotton M-roll surround
  • Hypervented magnetic structure

Flying attitude

The advanced rigging concept derives directly from its big brothers:
the RCF HDL 30-A and HDL 50-A.

The integrated mechanics are both fast and reconfigurable, allowing the system engineer to create J-shaped and spiral arrays. The hardware is designed for easy and fast setup. The angle can be adjusted on the ground before the system is hung and slipped automatically into the correct position as the array is pulled up.

Up to 20 HDL 28-A modules can be fastened on a single flybar.
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New perspective on linearity

RCF speakers are designed using a proprietary and advanced digital FiR technology, conceived to deliver transparent sound, absolute clarity, and perfect imaging to the listener. The special FiRPHASE filters allow for coherent distribution of sound for all listeners without phase distortions, ensuring minimum latencies in the system.
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The ideal flyable bass complement

Theatrical and indoor requirements often need space in front of the stage, leaving no space for subwoofers.
The HDL 36-AS is the ideal flyable bass complement for the HDL 28-A array system.
It features one 4.0” voice coil, 15” Neodymium woofer to handle 135 dB SPL Max from 40 Hz to 140 Hz with maximum linearity and low distortion. The built-in 3200 Watt Class-D amplifier delivers excellent playback clarity and up to 135 decibels SPL max. With RDNet compatibility, the HDL 36-AS is part of the professional HDL System.
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Acoustical specifications
Frequency Response:
50 Hz ÷ 20000 Hz
Max SPL @ 1m:
135 dB
Horizontal coverage angle:
Vertical coverage angle:
Compression Driver:
1 x 1.4'' neo, 3.0'' v.c
2 x 8'' neo, 2.5'' v.c
Input/Output section
Input signal:
Input connectors:
XLR, RDNet Ethercon
Output connectors:
XLR, RDNet Ethercon
Input sensitivity:
+4 dBu
Processor section
Crossover Frequencies:
750 Hz
Thermal, RMS
Soft Limiter
Preset, RDNet bypass
Power section
Total Power:
2200 W Peak, 1100 W RMS
High frequencies:
600 W Peak, 300 W RMS
Low frequencies:
1600 W Peak, 800 W RMS
Powercon IN/OUT
Physical specifications
Cabinet/Case Material:
PP Composite
Array fittings
2 Side
Black, White
294 mm / 11.57 inches
569 mm / 22.4 inches
491 mm / 19.33 inches
20.6 kg / 45.42 lbs
Shipping information
Package Height:
375 mm / 14.76 inches
Package Width:
650 mm / 25.59 inches
Package Depth:
500 mm / 19.69 inches
Package Weight:
23.6 kg / 52.03 lbs

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