REL Acoustics NO.31 (Black) Reference Series - Subwoofer Speaker

No.31 is nothing less than a pure reference model, sculpted from the flanks of the remarkable No.32, but using a newly developed 12 (350mm) all carbon fiber driver. Every facet of No.31 has been comprehensively upgraded and refined from its predecessor. No.31 delivers the classic Reference filter used in No.32, the same dual parametric filters, a driver that handles three times the power to deliver a truly thrilling experience.

*When Only the Best Will Do
(But Youve Run Out of Room)

No.31 exists to satisfy the needs of those who crave the finest yet have space limitations. Whilst some can afford our flagship No.32 model, it is larger and deeper than some rooms can accommodate. How can you best deliver No.32s sound quality, build quality, and thoughtful features with a more compact footprint? Enter No.31.

*Perfection Repeated

No.31 matches No.32s design stroke for stroke, yet somehow it manages to look more svelte, crouching closer to the flooralmost feline in its grace. The elegant plated handles inset into an ellipse is retained, as is the string grille that permits vast amounts of air to explode into your room without creating noise like cloth grilles can. No.31 features the curvilinear radius to the sidewalls that define both its performance and its character. But the reduction in visual and actual three-dimensional physical mass is remarkable. No.31: when the best must be delivered in a smaller space.

*Arrayed for Battle

No.31 permits the same vertically stacked line array as the ultimate No.32. It delivers transformative performance that no competitor has been able to. For those who have been seeking the ultimate musical and theatre experience, Line Arrays unlock the final dimension of system reproduction. Audiophiles have chased three-dimensional sound for years, yet they have missed the simple fact that the heightnot the depthof image is the missing link. By creating products that are designed to be stacked 3 (or in exceptionally tall rooms, 5) units high while retaining individual crossover and gain control of each subwoofer in the array, REL has created a masterpiece that finally delivers what the most experienced audiophiles have been chasing for the past 40 years.

*Amplified Perfection

No.32s 1,000 watt amplifier also lives inside No.31, only limited to 900 watts to ensure the perfect complement to the 12 bass engine within No.31. This allows the maximum dynamics to be delivered while ensuring a long, cheerful life for both components. Here too, the LimitLess Limiter, which permits the amplifier to tiptoe right up to its limit without audible compression is part of the magic, conveys a rhythmically effortless quality. Also, its dual parametric filters allow precise micro-tuning; the deepest bass is slightly reinforced, while the upper ranges of bass can be gently trimmed to ensure a brilliantly rendered transition from bass to the main speaker. The electronic design of the reference range is itself artistry.

**Specifications
Type
Closed box, front-firing driver

Active Driver Size & Material
12 in. (300mm) long throw, carbon fiber cone with inverted carbon fibre centre cap, die cast alloy chassis

Passive Radiator Size & Material
N/A

Low Frequency Extension
17Hz at -6 dB

Input Connectors
High Level Neutrik Speakon, Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR

Output Connectors
High Level Neutrik Speakon, (1) Low Level RCA, (1) LFE XLR, (1) Line XLR

Power Output
900 watts (RMS)

Amplifier Type
NextGen 7 Class D

Wireless Capability
REL AirShip II (sold separately)

Dual Parametric Filter
Yes

Protection System
Fully Electronic Set Safe
Yes

D.C. Fault
Yes

Output Short
Yes

Mains Input Voltage
220-240 volts, 110-120 volts for certain markets

Fuses
7 Amp semi delay 230 volts operation, 15 Amp semi delay 115 volts operation

Dimensions
W x H x D
25 1/8 x 17 x 28 1/2 in (638 x 435 x 720 mm)

Net Weight
114.5 lbs (52kg), shipping weight - 156 lbs (71kg)

Finish
Piano Black Lacquer, 12 coats

Supplied Accessories
Mains Lead
Yes

Neutrik Speakon
Yes (10 Meters Nominal)

Interconnect
Users Manual
Yes