RCF KXL 4-A Active Two-Way Array Speaker 135 dB 100 x 25 TRW

RCF KXL 4-A Active Two-Way Array Speaker with TRW Coverage

The RCF KXL 4-A is a compact, flexible active two-way array speaker designed for professional systems that demand 135 dB max SPL, precise directivity, and reliable rigging in both vertical and horizontal array configurations. A rotatable 100 x 25 degree True Resistive Waveguide (TRW) tightly controls dispersion, so engineers can sculpt coverage for clubs, churches, live venues, and Chicago ballrooms while keeping clarity and intelligibility consistent across the audience.

Low frequencies come from two 10 inch neodymium woofers with 3.0 inch voice coils in a bass-reflex enclosure, while the high-frequency section uses a neodymium compression driver with a 4.0 inch titanium dome on the TRW waveguide. A 3200 W two-channel Class-D amplifier, tailored to the transducers, delivers clean, high-headroom power with efficient convection cooling. The onboard DSP platform with FiRPHASE and Bass Motion Control (BMC) optimizes phase response and woofer excursion, backed by high-end AD/DA conversion for transparent processing.

Integrated RDNet networked management gives system engineers deep control and monitoring, including transducer status, temperature, VU meters, limiters, and more. The Baltic birch plywood cabinet, weatherproof polyurea coating, machined aluminum heat-sink structure, and high-strength steel rigging are built for touring and fixed installations alike, with powerCON TRUE1 TOP mains connectors and ergonomic handles simplifying deployment.

• High-output array element: 135 dB max SPL with 45 Hz – 20 kHz response for full-range reinforcement.
• Focused coverage: rotatable 100 x 25 degree TRW waveguide for precise vertical or horizontal arrays.
• Dual 10 inch neodymium woofers: 3.0 inch voice coils and hypervented cooling for punch and low compression.
• 4 inch titanium-dome compression driver: neodymium motor, high flux density, and low distortion.
• 3200 W Class-D bi-amplification: 2000 W LF plus 1200 W HF with convection cooling and fast limiting.
• FiRPHASE and Bass Motion Control DSP: coherent phase, extended low end, and controlled excursion.
• RDNet onboard: networked monitoring and control with multiple internal sensors.
• Tour-ready enclosure: Baltic birch, polyurea finish, structural steel hardware, and powerCON TRUE1 TOP.

Real-World Applications and Sound Roles

• Club and theater arrays: build precise hangs with tight 25 degree vertical coverage.
• Chicago DJ and event stacks: ground-stack or pole-mount KXL 4-A elements above subs for modern music rigs.
• Touring and rental inventory: flexible active array element that travels easily between venues.
• Installations with strict coverage control: use the TRW waveguide to keep energy off walls and ceilings.

Where the RCF KXL 4-A Excels

• Controlled Array Coverage: The 100 x 25 degree True Resistive Waveguide focuses energy where it is needed, making it easy to stack or fly multiple KXL 4-A cabinets without wasting output on ceilings or side walls.
• High SPL from a Compact Footprint: Dual 10 inch neodymium woofers and a 4 inch titanium-dome driver deliver up to 135 dB max SPL while keeping the cabinet size manageable for tight stages and truck packs.
• Networked System Management: RDNet onboard allows engineers to supervise temperature, VU meters, limiters, and transducer status, applying system-wide tweaks across arrays from a central computer.
• Advanced DSP and Linearity: FiRPHASE and Bass Motion Control work with the KX DSP platform to maintain clarity, phase coherence, and low-frequency integrity at any level.
• Precision Transducer Engineering: The neodymium compression driver with a 4 inch pure titanium dome and the hypervented woofers are optimized for power handling, low distortion, and long-term reliability.
• Transducer Swap Capability: The design supports transducer swapping with the proper firmware update, offering additional flexibility for service and system configuration as specified by RCF.
• Tour-Ready Mechanical Design: Baltic birch construction, polyurea coating, structural steel rigging, and ergonomic handles stand up to frequent load-ins, truck rides, and outdoor exposure.
• Built for Demanding Events: From high-energy DJ sets and live bands to corporate productions, the KXL 4-A behaves like a scalable array element rather than a simple point-source speaker.
• Friendly for Chicago DJs and techs: Fast rigging, predictable coverage, and active amplification support quick changeovers between DJ nights, festivals, and corporate ballrooms.

Control Modes and System Management for the RCF KXL 4-A

The RCF KXL 4-A integrates a next-generation DSP platform and RDNet networking so system technicians can shape the response of each cabinet locally or across an entire array.

• DSP with FiRPHASE and BMC: Internal processing aligns phase and amplitude, while Bass Motion Control maps woofer behavior to manage excursion and preserve low-frequency integrity.
• High-end AD/DA conversion: The signal path into and out of the DSP is kept clean and detailed to maintain the character of the mix.
• Crossover and protection: A 900 Hz crossover, thermal and RMS protections, and a fast limiter protect the drivers while retaining musical dynamics.
• Front-panel controls: The processor section offers Gain Reduction indication, delay and processing controls, plus 8 selectable presets so you can adapt the KXL 4-A to different array sizes and deployment scenarios.
• RDNet onboard: Each KXL 4-A appears as an addressable device in RDNet, enabling remote monitoring of sensors, level, and status, as well as centralized configuration for multiple arrays.
• Professional connectivity: Audio is handled via balanced XLR input and XLR link outputs, while RDNet Ethercon ports carry control data. PowerCON TRUE1 TOP in/out connectors provide secure mains distribution.

In-Depth Look at the RCF KXL 4-A Array Platform

Advanced Class-D Electronics and KX DSP Platform

The KXL 4-A uses high-powered Class-D amplifiers that are carefully matched to the low- and high-frequency sections, combining high efficiency with low distortion and reduced heat. The amplifier is mounted on a solid machined aluminum structure that acts as a large heat sink, allowing convection cooling without fans. At the core of the processing chain is the KX DSP platform, a real-time engine built to deliver high processing density and scalability for complex systems of RCF active speakers and DSP amplifiers.

True Resistive Waveguide and Coherent Directivity

The 100 x 25 degree True Resistive Waveguide is designed for consistent, coherent directivity across the listening area. The narrow 25 degree vertical pattern allows multiple KXL 4-A cabinets to be arrayed for precise coverage of deep rooms, raked seating, or large spaces without wasting acoustic energy. The horn can be rotated, so engineers can maintain the desired orientation of the dispersion pattern when the cabinet is used horizontally or vertically.

Precision Transducers and Swap-Ready Design

The high-frequency section employs a neodymium compression driver featuring a 4 inch pure titanium dome, ultralight edge-wound aluminum voice coil, high-flux magnet assembly, optimized phase plug, and copper ring design. This combination maximizes linearity, power handling, and sensitivity while keeping distortion low across the operating band. The low-frequency section uses two 10 inch hypervented woofers from the Precision Transducers line, with a large neodymium magnet, new aluminum basket, and intensive air-forced ventilation for efficient cooling and reduced power compression. The system architecture also allows transducers to be swapped when combined with the appropriate firmware update as specified by RCF, providing an additional level of service and configuration flexibility.

Bass Motion Control and FiRPHASE Processing

Bass Motion Control (BMC) extends low-frequency performance by mapping the dynamic behavior of the woofers and applying a custom algorithm to control over-excursion. Unlike traditional high-pass filters that simply remove low-frequency content and disturb phase and magnitude, BMC keeps the response linear while safeguarding the drivers. FiRPHASE processing uses advanced FIR filters to align phase and amplitude through the passband, providing transparent sound, precise imaging, and minimal latency for listeners throughout the coverage area.

Road-Ready Baltic Birch Enclosure and Rigging System

The KXL 4-A enclosure is built from high-quality Baltic birch plywood, assembled with water-resistant adhesive and finished with a weatherproof polyurea paint that resists water, UV, abrasion, and impacts. A machined aluminum structure on the rear panel reinforces the cabinet and offers efficient heat dissipation. High-strength structural steel rigging delivers a robust safety factor when the cabinet is flown, while die-cast aluminum handles with ergonomic rubber grips make handling and positioning easier. Waterproof powerCON TRUE1 TOP mains connectors round out a design intended for rigorous touring and outdoor conditions.

How to Deploy the RCF KXL 4-A in the Field

The RCF KXL 4-A is engineered as a versatile active array element that can be flown, ground-stacked, or pole-mounted, making it suitable for modular systems that scale from small events to large venues.

• Vertical arrays: Use the array fittings and threaded rigging points to build vertical hangs with multiple KXL 4-A cabinets, leveraging the 25 degree vertical coverage to aim sound precisely at the audience.
• Horizontal clusters: Rotate the TRW waveguide and create horizontal clusters where wide horizontal coverage and limited vertical spread are required, such as low ceilings or under balconies.
• Ground-stacked configurations: Stack KXL 4-A cabinets on appropriate subwoofers or platforms to form powerful ground arrays for festival stages or outdoor events.
• Pole-mounted setups: The 35 mm pole insert allows single-cabinet or small-stack deployment on stands or poles, ideal for mobile DJ rigs and small live shows.
• RDNet-based optimization: Once deployed, connect the KXL 4-A units to an RDNet network to align levels, check limiting, adjust delay, and fine-tune tonal balance across the entire array.
• Safe power and cabling: Use the powerCON TRUE1 TOP in/out connectors for secure, locking mains connections and XLR plus RDNet Ethercon for audio and control, routing cables along rigging paths to keep the system tidy.

From flown arrays to pole-mounted DJ stacks, the RCF KXL 4-A lets you build clean, scalable coverage patterns that match real-world Chicago rooms and outdoor stages.

Why Choose the RCF KXL 4-A from AVMaxx

The RCF KXL 4-A is designed for professionals who need a modern active array element with tight vertical control, strong output, and integrated network management. Partnering with AVMaxx ensures that this technology is matched to the way Chicago DJs, production companies, and venues actually work.

• Array-grade performance in an active package: 135 dB SPL, dual 10 inch neodymium woofers, and a 4 inch titanium-dome driver make the KXL 4-A a serious building block for scalable systems.
• Coverage tailored to real venues: The 100 x 25 degree TRW waveguide gives installers and engineers precise tools to shape coverage for long rooms, balconies, and tiered seating.
• Networked control ready out of the box: RDNet onboard means the KXL 4-A drops directly into modern networked workflows without external processors.
• Durability for Chicago streets and stages: Baltic birch, polyurea coating, structural rigging, and TRUE1 TOP connectors stand up to busy rental calendars and weather swings.
• Application-aware system design from AVMaxx: AVMaxx can help pair the KXL 4-A with appropriate subs, rigging, and control layouts for clubs, theaters, houses of worship, and mobile DJ rigs throughout the Chicago area.

AVMaxx combines RCF engineering with field-tested system design so your KXL 4-A arrays deliver consistent, confident results for DJs, bands, and production clients show after show.

Frequently Asked Questions — RCF KXL 4-A

Share your room layout, SPL goals, and DJ or live music needs with AVMaxx, and we’ll help you design an RCF KXL 4-A array system that hits coverage targets and keeps Chicago crowds locked in all night.