RCF SUB 708-AS MK3 18" Subwoofer

Description
Tech Specs
Delivery & Returns

Description

The SUB 708-AS mk3 is a portable 18" high-power active subwoofer for live sound applications. It features 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. Designed as the ideal complement for 8" or 10" loudspeakers, it provides outstanding performance in any application. Rear panel controls include volume, EQ, polarity, and crossover frequency selection. The rugged all-wood cabinet with scratch-resistant polyurea coating makes it durable, easy to carry and install securely. With its versatility, sound quality, and high power output, the SUB 708-AS MK3 is perfect for small to mid-sized venues and portable applications.

Power That Moves

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 aluminum 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

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.

Tour-Ready Workhorse

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.

Features

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

Why We Like This

The 18" woofer and high SPL capability provide strong low-frequency output for larger setups. The built-in crossover and BMC technology make it easier to integrate into a system while maintaining controlled performance.

FAQs

Q: What speakers pair well with this subwoofer?
It is designed to complement 8" or 10" full-range speakers.

Q: Does it include a built-in crossover?
Yes. It features selectable crossover presets (80Hz / 120Hz).

Q: Can I mount a speaker on top of the subwoofer?
Yes. It includes an M20 threaded pole mount for speaker mounting.

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:	700 W RMS / 1400 W Peak
Amplifier Class:	Class-D
LF Driver:	1x 18" / 45.7 cm Inverted Woofer Voice Coil: 3" / 76.2 mm
Frequency Range/Response:	35 Hz to 120 Hz
Maximum SPL:	133 dB
Protections:	RMS, Thermal
Crossover Frequency:	80 / 110 Hz
Audio I/O:	2x XLR 3-Pin Link Input 2x XLR 3-Pin Link Output
AC Input Power:	100 to 120 VAC, 50 / 60 Hz 220 to 240 VAC, 50 / 60 Hz
AC Power I/O:	1x IEC Input
Mounting:	1 x 1.38" / 35 mm Pole Socket (Top)
Handles:	2x Side
Dimensions:	27.2 x 26.9 x 19.8" / 69.1 x 68.3 x 50.3 cm
Weight:	88.2 lb / 40 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