RCF SUB 708-AS MK3 - 1400W 18-inch Powered Low Frequency Subwoofer with 3-inch Voice Coil in Black Finish

The RCF SUB 708-AS MK3 is a powerful, high-performance 18" active subwoofer designed for live sound applications. Featuring a state-of-the-art transducer with a high-power ceramic magnetic circuit and a robust 1400W Class-D amplifier, it delivers impressive sound pressure levels of up to 133 dB with exceptional headroom. This subwoofer is engineered to complement 8" or 10" loudspeakers, making it ideal for a wide range of applications, from small to mid-sized venues to portable setups. Whether you're using it in a PA system or for DJing, the SUB 708-AS MK3 offers exceptional bass performance with a clean, deep low-frequency response.

The subwoofer's design features a 18" woofer with a 3.0" voice coil, providing powerful low-end output with great accuracy and control. The speaker is powered by a Class-D amplifier that ensures extreme sound pressure levels with ultra-fast attack, realistic transient response, and low heat dissipation. The amplifier is mounted to a solid aluminum heat exchanger in the rear of the cabinet, eliminating the need for a fan and ensuring quiet operation. The advanced power management system makes the SUB 708-AS MK3 energy-efficient, while its robust design ensures reliability and longevity even under demanding conditions.

One of the key innovations in the SUB 708-AS MK3 is the Bass Motion Control (BMC) technology. This advanced excursion management feature allows the woofer to handle the lowest audible frequencies without compromising stability. The BMC system analyzes the dynamic behavior of the woofer and generates a custom algorithm that limits over-excursions, providing enhanced low-frequency performance and improved sound integrity. This eliminates the need for traditional high-pass filters, ensuring better sound reproduction without altering the phase behavior of the subwoofer.

Built with a Baltic birch plywood cabinet and a heavy-duty polyurea coating, the SUB 708-AS MK3 is designed for durability and ease of transport. The cabinet is lightweight, yet strong, and equipped with ergonomic handles with rubber grips for easy handling. The subwoofer also features an M20 threaded pole mount for speaker integration and is equipped with vented ports to improve efficiency and reduce distortion. The acoustically transparent sound foam backing on the inside of the grille ensures protection against dust and humidity, adding to the speaker's long-term durability.

Rear panel controls allow for precise customization of the sound, including volume, EQ, phase, and crossover frequency selection. The subwoofer features a stereo XLR input and output, making it easy to integrate into any audio system. With a frequency response of 35 Hz to 120 Hz, the SUB 708-AS MK3 delivers deep, powerful bass that enhances the overall sound experience. Whether used as part of a complete PA system or in conjunction with other RCF subwoofers, this subwoofer ensures immersive and clear bass in any live sound application.

Features

• 1400W peak power with 700W RMS for powerful, controlled bass output
• 18" woofer with a 3.0" voice coil for deep, accurate low-frequency performance
• Class-D amplifier with convection cooling for quiet, energy-efficient operation
• Bass Motion Control technology for enhanced low-frequency response and stability
• Stereo XLR input and output connectors for easy system integration
• Adjustable volume, EQ, phase, and crossover frequency controls for sound customization
• Durable Baltic birch plywood cabinet with scratch-resistant polyurea coating
• Ergonomic handles with rubber grips for easy transport and setup
• M20 threaded pole mount for integration with other speakers
• Vented ports for improved efficiency and reduced distortion
• Maximum SPL of 133 dB for powerful and immersive bass
• CE compliant and designed for long-term use in demanding environments

Specifications

Acoustical specifications

• Frequency Response: 35 Hz ÷ 120 Hz
• Max SPL @ 1m: 133 dB

Transducers

• Woofer: 1 x 18", 3.0" v.c

Input/Output section

• Input signal: bal/unbal
• Input connectors: XLR
• Output connectors: XLR
• Input sensitivity: -2 dBu/+4 dBu

Processor section

• Hi-Pass Frequencies: 110 Hz
• Low-Pass Frequencies: 80 Hz
• Protections: Thermal, RMS
• Limiter: Soft Limiter
• Controls: Volume, EQ, Phase, Xover

Power section

• Total Power: 1400 W Peak, 700 W RMS
• Low frequencies: 1400 W Peak, 700 W RMS
• Cooling: Convection
• Connections: VDE

Standard compliance

• Safety agency: CE compliant

Physical specifications

• Cabinet/Case Material: Baltic birch plywood
• Handles: One each side
• Pole mount/Cap: M20 thread
• Grille: Steel with clothing
• Color: Black

Size / Weight

• Height: 27.28 inches
• Width: 19.88 inches
• Depth: 26.97 inches
• Weight: 89.51 lbs

Shipping information

• Package Height: 28.94 inches
• Package Width: 22.24 inches
• Package Depth: 29.33 inches
• Package Weight: 100.53 lbs