
RCF - SUB 708-AS II 18" Bass Reflex Active Subwoofer
RCF - SUB 708-AS II 18" Bass Reflex Active Subwoofer, 700Wrms, 1400peak
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Finance this product
- From £28.17 / month (APR 16.9%) or 0% for 4 months
- With a 10% deposit from just £26.55 / month (APR 19.9%)
- SCANPROTECT Protect against installation damage for 28 days.
18" 700W Active Subwoofer
RCF - Sub 708-AS II

powerful bass reinforcement in a compact designRCF's SUB 708-AS II is a wonderfully compact and powerful bass reflex subwoofer for all applications. It is equipped with a 18” high power woofer with 3” voice coil, powered by a 1400 Watt digital amplifier in a robust plywood housing with deep and punchy tuning for a powerful bass. Thanks to the built-in digital stereo crossover (DSP) with adjustable crossover frequency, it can be easily and quickly set up with a satellite speaker. The SUB 708-AS II easily combines with 12” and 15”, ideal for RCF ART and D-Line Series.
at a glance
• 1400 Watt Digital Amplifier
• 18" Woofer, bass reflex housing
• Switchable crossover frequencies
• Stereo crossover
'A Superior Bass Experience'

Powerful lowsRCF subwoofers are the first choice of many sound engineers, thanks to the very high SPL levels at very low frequencies, smaller dimensions compared to the competitors, self-powered design, and impressive size/weight to SPL output ratio. Your crowd will be able to live an engaging immersive musical experience.

Cabinet & mechanicsThe RCF cabinets are made of birch plywood coated with a textured black finish. The subs are stackable and light-weight, for easy set-up and tear down, thanks to the ergonomic handles. A pole receptacle allows the use of the box in various configurations. The powder coated front grille integrates a special transparent-to-sound foam backing on the inside to further protect the transducers from dust.

Powerful class D amplifiersRCF's Class-D power amplifier technology packs huge performance operating with high efficiency into a lightweight solution. RCF amplifiers deliver an ultra-fast attack, realistic transient response, and impressive audio performance. The amplifier features a solid machined aluminium structure which not only stabilises the amplifier during transportation but also helps the fan-less heat dissipation.
The Tech Spec
Features | Specification | Frequency Response | 35 Hz - 120 Hz |
---|---|
Max SPL @ 1m | 133 dB |
Woofer | 18'', 3.0'' v.c |
Input signal | bal/unbal |
Input connectors | XLR |
Output connectors | XLR |
Input sensitivity | -2 dBu/+4 dBu |
Hi-Pass Frequencies | 110 Hz |
Low-Pass Frequencies | 80 Hz |
Protections | Thermal, RMS |
Limiter | Soft Limiter |
Controls | Volume, EQ, Phase, Xover |
Total Power | 1400 W Peak, 700 W RMS |
Low frequencies | 1400 W Peak, 700 W RMS |
Cooling | Convection |
Connections | VDE |
Safety agency | CE compliant |
Cabinet/Case Material | Baltic birch plywood |
Handles | 2 side |
Pole mount/Cap | Yes |
Grille | Steel |
Colour | Black |
Dimensions | Width: 505 mm / 19.88 inches Height: 665 mm / 26.18 inches Depth: 700 mm / 27.56 inches |
Weight | 37.6 kg 82.89 lbs |
PayPal Credit
Monthly Payment: | £34.99 |
Instalment Rate: | 16.9% p.a. (fixed) |
Cost of purchase: | £999.00 |
Total inc. interest: | £1,259.24 |
Monthly Payment: | £28.17 |
Instalment Rate: | 16.9% p.a. (fixed) |
Cost of purchase: | £999.00 |
Total inc. interest: | £1,351.92 |
Example | |
Minimum Spend: | £99 |
Instalment Rate: | N/A |
Cost of purchase: | £99 |
Total inc. interest: | £99 |
Representative Example:
Purchase Rate: 23.9% p.a. (variable)
Representative: 23.9% APR (variable)
Assumed Credit Limit: £1,200
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