REL's No.31 and No.32 Reference line subwoofers look to take no prisoners for those serious about subs with an equally serious budget.

Following the recent debut of its HT/1510 Predator II subwoofer, which we met at HiFi Lounge's recent REL open day, REL has announced its new Reference Series subwoofer line. This new range starts with the not insubstantial offerings of the No.31, featuring a 12-inch driver (900W RMS), and the No. 32, which sports a 15-inch driver (1,000W RMS) boasting 4-inches of stroke.

Both models are closed box designs with front-firing drivers constructed of long throw carbon fibre cones with inverted carbon fibre centre caps. These are powered by Class D amplification with dual parametric filters and an 80 dB gain control range. Furthermore, you get variable crossover control from 20 to 90 Hz and switchable phase control (0 or 180 degrees) to match the in/out motion of the subwoofer driver to the rest of the speakers in your system.

The rear panels are also shared by both models and include High-Level Neutrik speakOn, Low-Level stereo RCA, and XLR, LFE RCA, and Line XLR inputs alongside High-Level Neutrik speakOn, LFE XLR, and Line XLR outputs.

You might be glad to know that the new REL No.31 and 32 come with a neat, circular remote control instead of having to get to the rear panel to make adjustments. This handy device offers at-seat access to crossover control, parametric EQ, hi/low-level volume control, phase and more.

The No.31 measures 435x638x724mm (WxHxD) and the No.32, 540x743x816mm (WxHxD), with the No.31 going down to 17Hz (-6dB) and the No.32 diving down to 15Hz (-6dB). The finishes are a high gloss black for No.31 and a piano black lacquer for No.32.

Should you require even more low-end artillery, both models are stackable to create a line array. Using the REL Couplers, you can stack three subs (five if you've got the room height!). The couplers are solid, milled aluminium units that bolt to each sub and, along with the substantial rails on the underside of each cabinet, create an extremely heavy, sturdy bass tower.

The REL No.31 Reference Subwoofer (US$7,000) and No.32 Reference Subwoofer (US$10,000) are available now.

Visit REL Acoustics for more information