The RCF SUB 708-AS MK3 is a high-performance 18-inch active subwoofer built for professional live sound, DJs, touring systems, clubs, and event production. Powered by a 1400W Class-D amplifier, it delivers deep, controlled bass response with up to 133 dB SPL, making it ideal for high-impact low-frequency reinforcement in medium to large venues.
The RCF SUB 708-AS MK3 is a high-power 18-inch active subwoofer designed for professional live sound reinforcement, DJs, touring systems, and portable PA applications that require deep, impactful bass with exceptional clarity and reliability. Combining a powerful 1400W Class-D amplifier with an advanced 18-inch woofer and sophisticated DSP processing, this subwoofer delivers massive low-frequency performance suitable for demanding live environments.
Engineered as part of RCF’s professional SUB 7 Series, the SUB 708-AS MK3 is designed to pair perfectly with compact and mid-sized full-range speakers, creating a powerful and balanced PA system for concerts, clubs, weddings, corporate events, and mobile entertainment.
The SUB 708-AS MK3 features a high-performance 18-inch woofer with a 3-inch voice coil housed in a bass reflex enclosure optimized for efficiency and deep low-frequency extension. Powered by a 1400W Class-D amplifier, it delivers up to 133 dB maximum SPL while maintaining tight, controlled bass response.
Its extended low-frequency performance down to 35 Hz makes it especially suitable for bass-heavy music applications, live bands, DJs, and electronic music events where powerful sub-bass impact is essential.
The SUB 708-AS MK3 incorporates RCF’s Bass Motion Control (BMC) technology, designed to improve woofer excursion handling and low-frequency linearity while reducing distortion at high output levels. Unlike traditional high-pass filter systems, BMC allows deeper bass reproduction while maintaining woofer stability and sound integrity.
The built-in DSP section also includes electronic equalization, crossover management, polarity control, soft limiting, and protection systems for reliable long-term operation.
Official RCF specifications confirm the 1400W amplifier, 18-inch woofer, 35 Hz low-frequency response, and Bass Motion Control technology. :contentReference[oaicite:0]{index=0}
The SUB 708-AS MK3 is designed to complement 8-inch and 10-inch active tops while also working effectively with larger full-range systems. It is commonly used in mobile DJ rigs, live music setups, rental systems, and portable event production where strong low-frequency reinforcement is required.
Its integrated crossover presets and polarity controls allow easy system integration for optimized speaker alignment and balanced overall sound performance.
The cabinet is constructed from rugged Baltic birch plywood with a scratch-resistant polyurea coating, ensuring durability during transport and repeated live use. Ergonomic side handles simplify carrying and setup, while the steel grille and internal acoustic foam help protect the components from dust and moisture.
The front-ported bass reflex design also allows flexible placement in mobile and installed sound environments.
Live sound users and DJs frequently highlight the SUB 708-AS series for delivering powerful bass performance in a relatively portable single-18” format. Community discussions often recommend the 708-AS MK3 for pairing with RCF ART and NX tops in scalable mobile systems and live event applications. :contentReference[oaicite:1]{index=1}
The RCF SUB 708-AS MK3 is built for professionals who need deep low-frequency extension, high SPL performance, and reliable touring-grade construction in a portable active subwoofer. Its combination of advanced DSP processing, powerful 18-inch driver, and rugged wooden cabinet makes it an excellent solution for professional DJs, live sound reinforcement, event production, and scalable PA systems.
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