RCF SUB 18-AX 18" Powered Subwoofer

Description
Tech Specs
Delivery & Returns

Description

The SUB 18-AX is a portable 18" high-power active subwoofer for live sound applications with fully featured processing, a color touch panel, and remote control via Bluetooth®. The combination of a latest-generation transducer with a powerful Class-D amplifier delivers sound pressure levels up to 135 dB with exceptional clarity and headroom. SUB AX subwoofers are designed specifically for small to mid-sized venues and ideal for portable applications. SUB 18-AX is the ideal complement for 10", 12” or 15" woofer-size loudspeakers; it centralizes speaker management inside the subwoofer, providing dual crossovers, 8-band EQs, routing, delays, cardioid configurations, and recallable crossover presets. The polyurea-coated all-wood cabinet features a sealed Powercon True1 Top connector.

RCF cabinets are made of high-quality multi-ply hardwood coated with a rugged black (or white) polyurea finish. Subs are stackable and lightweight, have ergonomic handles with rubber grips, and are designed for easy set-up and tear-down. The M20 threaded pole mount on the top of the cabinet supports RCF speakers of various sizes. The powder-coated front grille integrates a special transparent-to-sound foam backing on the inside to further protect transducers from dust. SUB AX Series subwoofers are built to last, with powerCON® TRUE1 TOP mains connectors, so you can be sure that they will stand up to the rigors of use and transport.

Industry-Leading Subs

Lightweight and powerful, RCF woofers are a reference in high performance. RCF Precision Transducers engineers have developed new specific magnet sizes and molds to optimize magnetic flux while maintaining a low weight. The magnetic circuit topology is capable of delivering the highest, balanced level of performance in three specific areas: maintenance of a consistent, high integrity magnetic flux gap, exceptionally low distortion and efficiently integrating the magnetic circuit in a minimum weight design. The T-pole design optimization generates the minimum amount of flux modulation in the magnetic assembly during typical voice coil movement within the gap.

Drive the Rhythm of the Beat

With 2,200 Watts of power, our Class-D amplifier can manage extreme sound pressure levels with an ultra-fast attack, realistic transient response, and very low thermal loss. The stereo input circuit features a low distortion design with an advanced safety limiter, maintaining the true character of the input signal at all levels. RCF amplifiers are designed according to EN62368-1 for maximum safety and present a Switch Mode Power Supply section combining high efficiency with minimum weight.

Bass Motion Control

When searching for an extended bass with enhanced performance, RCF engineers found a way to remove the high-pass filter, replacing it with a forward-thinking approach. Introducing BMC (Bass Motion Control), the newly advanced woofer excursion management feature. The speaker equipped with BMC can handle the lowest audible frequencies without affecting the woofer stability, with extended linearity and better sound integrity.

The BMC method works by creating a complete map of the dynamic behavior of the woofer, to generate a custom algorithm that only limits over-excursions. This gives total freedom of signal reproduction to the transducer. When high-pass filters normally protect the woofer motion from becoming destructive but change the phase behavior, the new BMC algorithm breaks conventional rules.

Features

2200 Watt Class-D Amplifier
135 dB MAX SPL
18” Woofer, bass reflex housing
Digital Crossover w/ Presets
Multi-ply hardwood polyurea-coated
LiveRemote App
Dual XLR/TRS combo Input + Link, Dual XLR Xover Out
Bass Motion Control excursion management
Powercon True1 Top Sealed AC Connector

Why We Like This

The integrated DSP with touchscreen and Bluetooth control makes this subwoofer more than just a low-frequency unit—it becomes the control center of a full PA system. Combined with high output and flexible routing, it’s built for modern professional setups.

FAQs

Q: What makes the SUB 18-AX different from other RCF subs?
It features advanced DSP with a touchscreen interface and Bluetooth control, allowing full system management directly from the subwoofer.

Q: Can I control it remotely?
Yes. It supports wireless control via the LiveRemote app over Bluetooth®.

Q: Is it suitable for larger systems?
Yes. With 135 dB output and advanced processing, it is designed for professional and scalable sound systems.

Based in Chicago, IL, Gear Club Direct supports DJs, musicians, and audio professionals every day with reliable gear and knowledgeable service you can trust.

Tech Specs

Speaker Type:	Active Subwoofer
Enclosure Type:	Bass-Reflex
Total Output Power:	1100 W RMS / 2200 W Peak
Amplifier Class:	Class-D
LF Driver:	1x 18" / 45.7 cm Inverted Woofer Voice Coil: 4" / 101.6 mm
Frequency Range/Response:	35 Hz to 120 Hz
Maximum SPL:	135 dB
Protections:	RMS, Thermal
EQ & Filters:	8-Band EQ
Dynamic Processing:	Soft Limiter
Alignment Delay:	Up to 134 ms (147.6' / 45 m)
Digital Signal Processing:	Delay, User Settings
Audio I/O:	2x Combo XLR-1/4" TRS Line Input 2x XLR 3-Pin Link Output 2x XLR 3-Pin Line/High-Pass Output
AC Input Power:	AC Input Power
AC Power I/O:	1x powerCON TRUE1 Input 1x powerCON TRUE1 Output
Mounting:	1 x 1.38" / 35 mm Pole Socket (Top)
Handles:	1x Each Side
Dimensions:	27.3 x 27 x 19.9" / 69.3 x 68.6 x 50.5 cm
Weight:	96.6 lb / 43.8 kg

Delivery & Returns

At Gear Club Direct, we want you to be happy with your purchase. We understand that there are times when once a product is received, it may not be what you needed or wanted after all. So, we will gladly accept your qualifying return within 15 days of the delivery date. After 15 days of the delivery date, all sales are final.

The Return Process
Customers are required to obtain a Pre-Authorization to return any product. To submit a request for a return, simply log in to your account and request a return and one of our sales representatives will contact you within 24-48 business hours. If you do not have an account with us, please open a help ticket, providing as much detail as possible and whether you are requesting a refund or an exchange. READ MORE