Beauty, Power & Speed
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 our 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.
We want our customers to enjoy all this performance without being limited to only a few room locations, so we built-in our legendary 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 our competitor’s hardwired designs. It’s just another example of how we strive to offer complete and thoughtful solutions.
Clarity From Strength & Elegance
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. Minimizing 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, our bracing is not unlike the spars in a ship’s hull. Some may view this as excessive, but these are the lengths our design team goes to to deliver the finest subwoofer extant, fully fitting of the title No. 25.
Natural Floor to Ceiling Bass
When we experience bass in real time out in the world, it occurs with height to it. It strikes our sinuses, it kicks at our chest cavities, it rumbles along the floor conveying power authority and majesty. Our Reference Line Arrays permits bass to emerge more naturally, adding a height component in how it propagates throughout the room. The bottom unit reinforces the deepest overtones, creeping and rumbling across the floor to produce room shake. The middle location provides crisp attack and articulation of kick drums or any transient-based event. The unit imparts the flutter and shimmer of all manner of instruments floating in air. Making Reference Line Arrays the Holy Grail of the REL experience and is only available with our Reference products.
Since 90 percent of the energy produced by a system resides in the bass regions, Reference Line Arrays are the magic element missing from so many otherwise state of the art systems. This air, transparency and, of course, effortless power that Reference Line Arrays convey can’t be imagined, it can only be experienced in person.
Scalable Bass, From Whispers To Boom
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 our previous designs, making us 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 our designs. After all, dynamics are not merely the ability to play loud, but to bring to life the contrast between loud and soft passages in music or film. Ultimately, this is what makes the No. 25 the addiction it quickly becomes.
A Carbon Fibre Core
No. 25 has a heart of pure carbon, as we opted for a cone material that is stronger than steel, yet incredibly light. Carefully woven from pure carbon fibre, No. 25’s 15” cone structure weighs 70% less than a 10” cone of just two years ago. This combination of incredibly light weight coupled to remarkable structural integrity is what gives No. 25 its combination of speed and power.
Yet another benefit of the weight reduction strategy we employ is that it permits near-perfect dynamic balancing of the driver, yielding ideal behavior throughout its incredible 4” of fore-and-aft stroke.
Fine Tuning In The Palm Of Your Hand
Begin your relationship with REL Reference by simply picking up the remote; feel its heft, how its rounded contours fit gently in the cup of your hand. This is a carefully wrought system improvement that encourages the sort of finely detailed decisions during set-up necessary to achieve the perfect balance to the ultimate system owner.
REL Reference models employ remote control in order to assist and increase ease of initial set-up. We do this knowing that once properly set, the owner will likely use it rarely during the remainder of their ownership experience as RELs truly can be set-up correctly to reproduce all forms of music and film without resorting to cheap parlor tricks like turning bass up for movies and down for music.
- 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
- 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: WIDTH 29 in. x Height 21.3 in. x Depth 30 in.(736.5 x 540 x 762 mm)
- NET WEIGHT: 168 lbs. (76 kg)
- FINISH: Piano Black Lacquer, 12 coats
We make subwoofers. That’s it. Nothing else. No distractions. Nothing to steal our focus. No kidding ourselves that we can be good at everything. No trying to conquer the whole world. We just do our best to conquer our bit of it.
Each day we come in to work in pursuit of only one intention, to produce the most raw, perfect, pure sound possible, to capture the raw intention of the artist. We use the best quality materials, employ the most exacting construction requirements. We think of the problem holistically. We pursue the chase of the perfect experience of sound with an obsessive passion and vigor.
We do it because we love sound. We believe sound can move people more than any other sense. We believe it’s the integration of the bass via the perfect subwoofer that makes everything else better. And, ultimately, there is a great deal of satisfaction to be gained from doing this well, creating something of unique quality, such that you know it is going to inspire. It makes the hard work and the obsessing over each and every detail worth all the effort. That’s our reward.
From the beginning this has been a labor of love, born from a desire for a more perfect sound experience. It began with one man’s dissatisfaction with the performance of subwoofers available at the time. That search for better, that pursuit of perfect sound remains the driving force behind REL. It has persisted through changes in ownership, it has driven massive advancements in technology and innovations in designs. Turning loose the power, the drama and the fun that lies within great music and movies.
1990 – HIGH LEVEL INPUT:
Key to this evolution was the adoption early on of a High Level connection, one that derives its input signal from the final output stage of an amplifier or receiver. This produces a seamless quality that precisely matches the sound being fed to your loudspeakers.
1998 – ABC INPUT FILTERS:
These early predecessors to the modern REL filter technology used complicated banks of rotary switches to set crossover points but while they were slow by modern REL standards they were miles ahead of the competition and served us well for almost a decade.
1998 – HIGH CURRENT AMPLIFIERS:
Current, not voltage, is what produces movement in large high powered subwoofer drivers. Our engineers ensure that our designs are incredibly robust and produce tons of current which means they not only reproduce the attack and body of a note, but also the echoes as sound dies away. All amplifiers are not the same and ours are designed specifically to reproduce the lowest of bass notes.
2005 – THE MODERN ERA:
With new ownership came fresh new ideas, efficient global sourcing of components, Silicon Valley engineering and a renewed emphasis on performance, reliability and design. Compared with products produced before this modern RELs play on average twice as loud, are twice as fast, cost far less for similar performance, and look far crisper and more modern than their predecessors.
2007 – NATURALSOUND FILTERING:
Modern REL input filters are exceptionally fast and are the true secret to producing perfect, seamless integration of the main speakers with REL subs. Simple, fast and cleverly designed to eliminate the bumps and discontinuities of competitors, these filters are the secret ingredient buried inside every REL.
2010 – MUSICAL INSTRUMENT GRADE BRACING:
All modern REL designs use heavy duty bracing designed to break up cabinet resonance modes. Many competitors use little to no bracing and those that do frequently use a simple window pane brace that creates massive turbulence and noise inside the cabinet eventually resulting in blurring of detail. On our costlier models, we employ much more elaborate bracing and materials improve all the way up to laminated hardwood braces on our Reference grade products. Proper bracing breaks up boomy cabinet resonances that destroy the correct pitch of instruments far outside the bass region.
2010 – CARBON FIBRE DRIVER CONES:
With the advent of Gibraltar, we moved decisively to the head of the class with the Holy Grail of speed ,stiffness and self-quieting in a virtually perfect bass driver. The first reference series product to emerge from the modern REL was called the G-1 and in its first three months outsold the entirety of its predecessor’s 8 year long career. Since that debut, we use carbon whenever budget permits as it imparts speed, clarity and control down low that is unparalleled.
2010 – UTRASPEED FILTERS:
These new Reference Series filters are as fast as theory permits a filter to be and many times faster than most competitors. Even something as arcane as setting correct phase becomes as clear and evident as turning on a light switch.
2014 – ZERO COMPRESSION WIRELESS:
Perhaps the name doesn’t fall trippingly from the tongue, however at a time when competitors were using antiquated Bluetooth-based systems wholly unsuitable for high end audio applications, we were setting the industry on its ear. First Longbow, using all discrete components—dedicated A/D encoders, D/A decoders and multiple dedicated power supplies and analog filters– showed how unbelievably great sounding wireless without the effects of digital compression could sound. One year later Arrow took the idea of wireless being sent broad bandwidth without the crutch of compression/expansion schemes and brought the price down by half. At REL, there is a restless urgency and a passion to get things right, then to see how far we can push these benefits down market so that the greatest number of people are helped by our team.
2016– NO. 25 ANNIVERSARY MODEL:
No. 25 commemorates and celebrates our quarter century of building the finest sub bass systems, while pointing to the future and our next 25 years as it employs our most advanced design, engineering and craftsmanship. The No. 25 combines the power of an ultra-reliable 1,000 watt NextGen3 Class D amplifier, with a lightweight and perfectly balanced carbon fibre 15” driver. All this is controlled by our 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 for. Learn more
2018– DEBUT OF SERIE HT & HT-AIR WIRELESS:
Serie HT was designed specifically to answer the challenge of creating affordably priced, exceptionally dynamic, pure home theater powered subwoofers. With the ideal combination of a lightweight, modern CarbonGlas™ drivers coupled to a powerful Class D amplifier that runs cool, these subwoofers produce extraordinary dynamics. For REL owners already enjoying our Reference, Serie S and T/i subwoofers designed for both 2-channel and theater use, the HT series was designed to supplement their system’s .1/LFE output to produce extremely high output for chest rumbling home theater special effects.
We’ve stripped back the High Level feature from the Arrow™ wireless to provide a wireless system dedicated for Home Theater buffs, the HT-Air™. Though it is affordable, it retains our single-minded focus on delivering zero compression and maximum dynamics.
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