REL No.25 SubwooferREL No.25 Subwoofer
REL Acoustics

No.25 Subwoofer

No. 25 commemorates the quarter century of REL building the finest sub bass systems, while pointing to the future and the next 25 years as it employs their most advanced design, engineering and craftsmanship.

3 Years

£7,200

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Description

No. 25 combines the power of an ultra-reliable 1,000 watt amplifier, with a lightweight and perfectly balanced carbon fibre 15” driver. All this is controlled by REL’s legendary filter sets and proprietary crossovers with 2 separate parametric equalizers permitting remarkably flat in-room response, while maintaining the speed and resolution for which modern RELs have become known.

REL want their customers to enjoy all this performance without being limited to only a few room locations, so they built-in LongBow™ wireless receivers into every No. 25. This design utilizes zero compression, resulting in stunning dynamics and bass extension without being tethered to a cable, while delivering sound quality comparable to competitor’s hardwired designs. It’s just another example of how REL strive to offer complete and thoughtful solutions.

No. 25 marks a new standard in cabinet execution, both for its physical beauty and the manner in which it manages the critical backwave propagating from the rear surface of the massive 15″ carbon fibre piston at its heart. The shape of No. 25 is designed to disturb and cancel much of the incredible force created by the inward stroke as No. 25 reloads for your music or film’s next set of demands. It is necessary to keep this backwave as silent as possible, while allowing the driver to “breathe” without compressing dynamics. The curvilinear cabinet walls deflect, diffuse and dissipate these waves into smaller cross plane waves. Minimising rear waves that eventually emerge as comb filtering — noise that cancels the primary bass — is what creates clear, purposeful bass that strides into a room with tremendous energy and clarity.

Comprised of 30mm thick (about 1 1/8″) Australian MDF, transected by hardwood spars that break up common mode resonances within the top surface of the cabinet and down its sidewalls, the bracing is not unlike the spars in a ship’s hull. Some may view this as excessive, but these are the lengths REL’s design team goes to to deliver the finest subwoofer extant, fully fitting of the title No. 25.

It takes huge power to invest the No. 25 with the shattering dynamics of which it is capable. The rugged beast of a 1,000 watt NextGen3 amplifier that powers No. 25 has already proven itself in the field in one of REL’s previous designs, making them comfortable with not only its startling sonic performance but also its reliability.

However, No. 25 is no mere exercise in excess, but rather a thorough exposition in the art of rendering sub bass, totally, completely and with great deftness in tonality, expression and dynamics. It is this ability to not merely play loud, but to bring to life the contrast between loud and soft passages that makes REL owners so passionate about their designs.

TYPE
Closed box, front-firing driver

ACTIVE DRIVER SIZE & MATERIAL
15 in., 380mm long-throw, carbon fibre cone with inverted carbon fibre dust cap

PASSIVE RADIATOR SIZE & MATERIAL
N/A

LOW FREQUENCY EXTENTION
-6dB at 14 Hz

INPUT CONNECTORS
High Level Neutrik Speakon, Low Level stereo RCA, LFE RCA, LFE XLR, SMA for wireless antenna

OUTPUT CONNECTORS
High Level, LFE RCA, LFE XLR Daisy Chain Outputs

POWER OUTPUT
1,000 watts (RMS) Ultra High-Current Power Supply

AMPLIFIER TYPE
NextGen3 Class D

WIRELESS CAPABILITY
Longbow (Optional), Zero Compression, Individual discrete D/A and A/D Encoders

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
29 x 21.3 x 30 in. (736.5 x 540 x 762 mm)

NET WEIGHT
168 lbs. (76 kg)

FINISH
Piano Black Lacquer, 12 coats

1 x Sub, 1x Mains Lead, 1x 10m Neutrik speakon cable, 1x User manual