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Description
RCF SUB 708-AS MK3 Bass Reflex Active Subwoofer - 18"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,
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.
Legendary subwoofers
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.
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.
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
Specifications
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
Well made; works as it should!
Color: White, Size: 10FT (2 USB-C)
Works perfectly as stated. Flush with wall. Better than I anticipated. Cord well made. Not cheap
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
★★★★★ 5
Good extension cord
Color: White, Size: 10FT (2 USB-C)
I have an upside down plug halfway up my wall that was really difficult to use and this is really been a game changer. It's flat against my wall so I'm not going to hit the cord and it it's long enough to put it in a more usable spot in the spare bedroom. The USB ports come in handy so I can keep the outlets free for my TV, lamps etc.
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Reviewed in the United States on March 5, 2026
★★★★★ 5
Works well
Color: White, Size: 5FT (2 USB-C)
Works pretty well and the 360 rotation feature is super useful.
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Reviewed in the United States on April 3, 2026
★★★★★ 5
Nice oak corner shelf but check your measurements first
5 stars for the shelf, 3 stars for myself :-)
This is a well-made oak corner shelf that looks great where I put it. The wood is nice quality and the construction is solid.
Before you order though, do yourself a favor and check two things: 1) Make sure the size is actually big enough for what you need, and 2) Check that your corner is actually a true 90-degree angle. Turns out mine isn't perfectly square and now I'm trying to figure out how to position this thing properly.
Good product overall, just wish I'd measured more carefully before ordering.
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Reviewed in the United States on August 12, 2025
★★★★★ 5
It’s Poyfect!
Color: White, Number Of Shelves: 2, Size: 35.4inch(set of 2), Color: White, Number Of Shelves: 2, Size: 35.4inch(set of 2)
i’ve been wanting this shelf for quite some time and finally decided I’m doing it. I’m absolutely completely satisfied with the size the quality of the wood and the paint job. It’s made very well. I have to say I was surprised at how nicely sanded it was and ready to hang.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 10, 2025
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