RCF SUB 708-AS III

The RCF SUB 708-AS III is a 18" high-power portable active subwoofer with incredible power. Featuring a state-of-the-art transducer with a high-power ceramic magnetic circuit and a powerful Class-D amplifier that delivers sound pressure levels up to 133 dB with exceptional headroom, the 708-AS III provides outstanding sound performances every time.

With rear panel controls including volume, EQ, polarity, delay and crossover frequency selection, the Sub 708-AS III is a versatile subwoofer. The rugged design and scratch-resistant polyurea coating makes it incredible easy to carry and install into any PA speaker set up. All this together makes the 708-AS III the perfect subwoofer for any small to mid-sized venues.

• 1400 Watt Class-D Amplifier
• 18” Woofer, bass reflex housing
• Stereo Crossover
• Switchable Crossover Frequencies
• Polarity-reverse switch
• Electronic equalization, soft limiter and protection
• Stereo XLR input, Stereo XLR signal output
• Bass Motion Control excursion management

RCF subwoofers are the first choice of many sound engineers, thanks to the very high SPL levels at very low frequencies, small dimensions compared to the competitors, self-powered design, long-term reliability, and impressive size/weight to SPL output ratio. Your crowd will be able to live an engaging immersive experience in both live sound or DJing applications.

RCF's improvements in transducer design make them stronger and more powerful so the amplifier follows the evolution. With 1400W peak power, the Class-D amplifier manages extreme sound pressure levels with an ultra-fast attack, realistic transient response, and very low heat loss. The speaker design is energy-efficient so there's no need for a cooling fan.

The amplifier is attached to a solid aluminium heat exchanger in the rear of the cabinet with no moving parts. The stereo input circuit with crossover features a new 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 joining high-efficiency with minimum weight.

SUB 7 Series subwoofers can be configured from the rear panel, and features a full set of commands:

• X-OVER PRESET 80Hz/120Hz
• POLARITY REVERSE
• OUT SIGNAL, LINE / HIGH PASS

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 behaviour 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 behaviour, the new BMC algorithm breaks conventional rules.

The subwoofer is suitable for a wide range of live sound applications. The rugged all-plywood cabinet is easy to carry and stack, due to its light-weight. All are equipped with ergonomic handles with rubber grips for easy set-up and tear down. The M20 threaded pole mount on the top allows the cabinet to support speakers with a pole mount.

The heavy-duty polyurea coating, the powder-coated metal grille, and the rugged structure of the cabinet withstand long-term use and transportation. Separate housing for the amplifier guarantees component efficiency and reliability. An acoustically transparent sound foam backing on the inside of the grille ensures protection from dust and humidity. With its frontal vented ports, the subwoofer can also be used in recessed spaces.

Acoustical Specifications

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

Transducers

• Woofer: 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: Yes
• Grille: Steel with clothing
• Colour: Black

Size

• Height: 693 mm / 27.28 inches
• Width: 505 mm / 19.88 inches
• Depth: 685 mm / 26.97 inches
• Weight: 40 kg / 88.18 lbs

Shipping Information

• Package Height: 735 mm / 28.94 inches
• Package Width: 565 mm / 22.24 inches
• Package Depth: 745 mm / 29.33 inches
• Package Weight: 45 kg / 99.21 lbs