RCF HDL 38-AS Active Flyable Subwoofer 136 dB SPL RDNet Bass

RCF HDL 38-AS Flyable 18-Inch RDNet Subwoofer System

The RCF HDL 38-AS is an active flyable subwoofer module built to extend HDL 30-A line arrays with real low-frequency authority while staying compact and rigging-friendly for theaters, indoor venues, and production companies. A single 18 inch neodymium woofer with a 4.0 inch voice coil delivers deep, controlled bass from 30 Hz to 140 Hz, reaching up to 136 dB max SPL with low distortion and high linearity across the operating band.

A 3200 W peak / 1600 W RMS Class-D amplifier drives the transducer with high efficiency and fast transient response. The amplifier is built on a solid machined aluminum structure that stabilizes the electronics during transport and supports fan-less convection cooling, while an SMPS power supply helps keep weight manageable without sacrificing output. Built-in protections and a soft limiter safeguard the system when used hard in demanding shows.

Like the rest of the HDL family, the HDL 38-AS integrates with RDNet networked management. Through RDNet, engineers can monitor each subwoofer, apply processing, and integrate the low-frequency system with HDL 30-A arrays and other compatible devices from a central interface. Volume and preset selection controls on the module make local setup straightforward when a full network is not required.

The cabinet is constructed from Baltic birch plywood with integrated array fittings that are mechanically compatible with HDL 30-A rigging, making it easy to design flown bass systems that follow the same geometry as the main array. A heavy-duty steel grille with internal acoustic foam helps protect the transducer, and an available rain cover supports weather-aware deployments. Black and white (RAL 9003) finishes allow the system to blend into clubs, theaters, churches, and high-end corporate or wedding environments.

Real-World Applications and Sound Roles

• Flyable bass extension for HDL 30-A line arrays in theaters, clubs, and live music venues.
• Low-frequency system for indoor touring rigs that need compact, high-output sub arrays.
• Installed subwoofer solution for houses of worship and performance spaces using HDL 30-A tops.
• Flown or clustered subs for corporate AV, ballrooms, and convention centers where sightlines matter.
• Bass foundation for Chicago event companies and DJs deploying HDL 30-A based systems.

Where the RCF HDL 38-AS Excels

• Flyable Bass for HDL 30-A: Designed as the ideal bass partner for HDL 30-A arrays, sharing compatible rigging hardware for coherent flown systems.
• Deep 30 Hz Extension: 30–140 Hz frequency response lets systems reach true sub-bass while keeping the footprint focused for indoor venues.
• High Output Headroom: 136 dB max SPL gives each module serious punch, so fewer enclosures can carry larger rooms when correctly deployed.
• Precision 18 Inch Neodymium Driver: A neodymium motor with a 4.0 inch voice coil supports high power handling and low distortion at show levels.
• 3200 W Class-D Power: Lightweight, efficient Class-D amplification with SMPS supply combines fast attack with strong low-frequency control.
• RDNet Networked Management: RDNet onboard opens up integrated monitoring, line array design tools, and detailed DSP control from one software platform.
• Touring-Grade Birch Cabinet: Baltic birch plywood construction, steel grille, and protective foam backing stand up to transport and daily use.
• Flexible Color Options: Available in black or white (RAL 9003) to match interior design, worship spaces, and upscale wedding or corporate rooms.
• Ready for Chicago Events: A strong choice for Chicago production houses and DJs that need compact, flyable subs to keep dance floors energized without cluttering stages.

Control Modes for RCF HDL 38-AS

The HDL 38-AS provides both local panel controls and full RDNet integration so you can adapt the sub system to each venue and show. Straightforward analog connections and simple control points keep standalone operation easy, while RDNet opens up detailed tuning and monitoring when the system is networked.

• Signal and Network I/O: Balanced and unbalanced audio can be connected via XLR input and link outputs. RDNet Ethercon ports allow the subwoofer to join the RDNet control network alongside HDL 30-A arrays and other compatible devices.
• Volume Control: A dedicated volume control on the module lets you trim the low-frequency level relative to the main arrays during system setup or fine-tuning.
• Preset Selection: Preset selection control provides access to factory voicings stored in the onboard DSP, aligning the subwoofer response with common deployment scenarios and array designs.
• Onboard Protections: Thermal and RMS protections, together with a soft limiter, protect the amplifier and transducer during demanding shows while keeping performance predictable.
• RDNet Platform: Within RDNet, engineers can monitor every connected HDL 38-AS module, group subs, apply processing, and integrate them with the rest of the HDL system using tools for system control, line array design, and acoustic measurement.
• Power Distribution: Powercon IN/OUT connections support secure AC daisy-chaining across flown or clustered subs, simplifying power runs in larger systems.

Deep 30–140 Hz Bass from an 18 Inch Neodymium Engine

At the heart of the HDL 38-AS is a single 18 inch neodymium woofer with a 4.0 inch voice coil, optimized to deliver powerful, articulate bass from 30 Hz to 140 Hz. The design focuses on achieving high linearity and low distortion so that kick drums, synth bass, and cinematic effects remain tight and controlled even at elevated output levels. This allows HDL 30-A arrays to operate in a more comfortable band while the HDL 38-AS handles the heavy lifting in the low end.

3200 W Class-D Amplifier with Lightweight SMPS Power

The built-in 3200 W peak Class-D amplifier is designed to pack high performance into a portable, installation-friendly format. RCF Class-D technology is engineered for high efficiency, ultra-fast attack, and realistic transient response, so the system stays responsive and musical. A solid machined aluminum structure stabilizes the amplifier during transportation and supports fan-less convection cooling, reducing moving parts. An SMPS power supply section helps the module deliver maximum output while keeping weight manageable for flown systems and everyday handling.

RDNet Networked Control for Integrated HDL Systems

The HDL 38-AS is part of the broader RDNet ecosystem, an advanced platform for integrated monitoring and control of sound systems ranging from small setups to large arenas. RDNet combines system control, line array design tools, and audio measurement into a single software package, giving engineers a comprehensive view of their rigs from one interface. In practical use, HDL 38-AS subs can be grouped, processed, and monitored alongside HDL 30-A arrays and other compatible devices to create cohesive full-range systems.

With real-time access to operating status and DSP parameters, engineers and technicians can quickly refine system response and correct issues before they become problems. This level of control is especially valuable in complex theatrical, corporate, or worship environments where multiple zones and coverage requirements must be balanced.

Baltic Birch Cabinet, Rigging, and Weather-Aware Options

The HDL 38-AS enclosure uses Baltic birch plywood for strength, acoustic consistency, and durability. Integrated array fittings are engineered for easy and fast setup and are fully compatible with HDL 30-A rigging, so flown bass arrays can share the same mechanics and geometry as the main system. A front steel grille is powder coated for long-term wear resistance, while transparent-to-sound internal foam provides additional protection against dust.

For applications where weather exposure is a concern, a dedicated rain cover is available to improve weather resistance. Together, these mechanical features make the HDL 38-AS suitable for both touring and semi-permanent installations where reliability is non-negotiable.

Precision Transducers for Modern Low-Frequency Performance

RCF precision transducers draw on developments such as advanced neodymium magnetic circuits, innovative voice coil ventilation systems, and direct drive voice coil assemblies. These technologies are applied in the HDL 38-AS to support higher power handling, reduced power compression, and improved thermal behavior. For users, this translates into more consistent low-frequency performance across long events and repeat shows.

Black or White Finishes for Theaters, Worship, and Events

Available in black or white (RAL 9003), the HDL 38-AS can be matched to the visual needs of many different environments. Black cabinets integrate naturally into club and theater rigs, while white subs are an ideal fit for corporate AV, worship spaces, and high-end wedding production where loudspeakers must blend into clean stage designs and room decor.

How to Deploy RCF HDL 38-AS in the Field

When building a system around HDL 30-A arrays, treat the HDL 38-AS as the dedicated flyable bass element. Use the cabinet's array fittings and HDL 30-A compatible hardware to integrate subs into flown configurations according to RCF rigging documentation and load tables. Align the number of HDL 38-AS modules and their positioning with the main arrays so low-frequency coverage follows the same audience geometry.

During system setup, use the HDL 38-AS volume and preset selection controls to bring the low-frequency level and voicing into the right range for the room. Once the physical rig is built, connect the subs and arrays to RDNet so you can manage them as a single system. RDNet tools, together with RCF subwoofer alignment resources, support tuning of time, level, and processing for a coherent transition between HDL 38-AS subs, HDL 30-A arrays, and any supplemental speakers.

The enclosure also includes an M20 threaded point, giving system designers options for compatible pole-mount or cap solutions when appropriate. Regardless of the configuration, keep cable runs clean by taking advantage of Powercon IN/OUT and XLR link connections, and verify that each module's indicators and network status are correct before the audience arrives.

Build your HDL 30-A rig on a foundation of HDL 38-AS subs, then use RDNet and RCF alignment tools to lock in tight, musical low end that follows the same coverage footprint as your main arrays.

Why Choose the RCF HDL 38-AS from AVMaxx:

AVMaxx works directly with systems that rely on RCF HDL arrays, so we understand how crucial the low-frequency section is to the overall impact of a show. The HDL 38-AS is not just any 18 inch subwoofer; it is voiced and engineered as the flyable bass counterpart to the HDL 30-A, with matching rigging and RDNet integration. Our team can help you design systems that take full advantage of those strengths instead of treating the subs as an afterthought.

Whether you are outfitting a theater, modern worship space, corporate ballroom, or building a touring rig, AVMaxx can guide you on how many HDL 38-AS modules you need, how to pair them with HDL 30-A arrays, and how to structure your RDNet layout for reliable day-to-day operation. We focus on practical details like deployment workflow, alignment strategies, and service considerations so your investment keeps delivering consistent results.

For Chicago DJs, event companies, and installers, working with AVMaxx means getting product recommendations that take into account local venue realities and real-world usage. From first quote to final tuning, our priority is to make sure your HDL 38-AS subs and HDL 30-A arrays are working together as a complete, professional HDL system.

AVMaxx is your partner for RCF solutions—field-aware recommendations, dependable support, and builds that help Chicago DJs and event pros perform with confidence.

Frequently Asked Questions — RCF HDL 38-AS

Share your venue layout, coverage goals, and existing HDL 30-A inventory with AVMaxx, and we will help you design an HDL 38-AS bass system that delivers tight, musical low end for every show.