REL Acoustics Classic 99
The REL Classic 99 delivers rich, textured bass with the weight, warmth and control to make a stereo system feel larger and more lifelike. Its 12-inch sealed, down-firing design and high-level connection enable seamless integration, while the walnut cabinet brings genuine furniture-grade appeal. Future Audiophile and hi-fi+ found it enhances clarity, space and musical presence well beyond the low end.
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Deliciously Crispy
Bass
92/100
Integration
93/100
Dynamics
88/100
Build Quality
92/100
Features Usability
87/100
Value for Money
94/100
Pros
Deep, warm and controlled bass adds convincing weight, texture and room-filling impact without losing composure.
Exceptional integration can make the subwoofer disappear, while improving the whole soundstage, vocals and instrumental detail.
High-quality walnut veneer, thick cabinet construction and classic styling make it unusually attractive for a subwoofer.
Flexible high-level, RCA and LFE inputs support straightforward integration with both stereo and home-theater systems.
Cons
Its rounded, generous voicing is not the last word in transient speed or punch compared with faster rivals.
There is no onboard EQ or app-based room correction, so difficult rooms may require careful placement, setup or external equalisation.
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What Reviewers Are Saying
Assessments of Build Quality, Usability, and Overall Propositions.
Bass
92/100
Reviewers consistently praise deep, weighty and controlled bass, describing bass lines as tighter, easier to follow, and more substantial. It can energize a room convincingly and adds rich texture and pressure, though its deliberately warm, rounded character can leave a little lingering bass detail in less accommodating rooms.
Integration
93/100
Integration is a major strength in the listening reports: one reviewer heard “no discontinuity” between speakers and subwoofer, while another said it became “one complete sound field.” High-level connection, careful phase adjustment, and time alignment are repeatedly discussed as useful routes to this seamless result, rather than the sub drawing attention to itself.
Dynamics
88/100
The Classic 99 is described as visceral, taut and clean with enough grunt to underpin music at sensible volumes without losing composure. Reviewers also found its added bass pressure made music feel impactful, but comparisons note that REL’s T/x range and the Magico ASUB offer greater transient speed and punch.
Build Quality
92/100
Reviewers find the thick-walled, well-braced cabinet, walnut veneer and overall fit and finish exceptionally well executed. The veneer was praised as close enough to solid walnut to be mistaken for it, and the sub is widely seen as substantial enough to work as an attractive piece of furniture.
Features Usability
87/100
The Classic 99 offers flexible high-level, low-level RCA and LFE connections, with adjustable crossover and level controls, and reviewers found it straightforward to dial in. The supplied long Speakon cable and optional wireless systems broaden placement options, although one reviewer would welcome onboard EQ for more difficult rooms.
Value for Money
94/100
At around £1,799/$1,899, reviewers repeatedly call the Classic 99 remarkable or difficult to better for the money, particularly for a music-focused, beautifully finished subwoofer. It costs more than REL’s T/9x and a stereo pair is a significant investment, but commentary generally finds its sound, finish and likely resale appeal persuasive against peers in this class.
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Specifications
- Type
- Closed Box, down-firing driver
- Active Driver Size & Material
- 12 in. (305mm) Amended Pulp-on-Paper, Downfiring Inverted Cone, Steel Chassis
- Passive Radiator Size & Material
- -
- Low Frequency Extension
- -6dB at 24Hz Low Frequency
- Input Connectors
- High Level Neutrik Speakon, Low Level RCA, LFE RCA
- Output Connectors
- N/A
- Power Output
- 450 watts (RMS)
- Amplifier Type
- Class D
- Wireless Capability
- HT-Air MKII Wireless or AirShip II, Sold separately
- Dual Parametric Filter
- N/A
- Finish
- Walnut veneer
- 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
- 4 Amp semi delay 220 volts operation 8 Amp semi delay 120 volts operation
- Mains Lead
- Yes
- Neutrik Speakon
- 10 Meters (33’6”) Nominal
- Interconnect
- -
- User Manual
- Yes
- DIMS
- W x H x D \n 15.75 in. × 21.0 in. × 13.8 in. \n(400 × 534 x 350mm) Add 1.75in \n(44.5mm) in depth when using a High Level connector \n \n Shipping DIMS \n W x H x D \n 22.5 in. × 27.6 in. × 20.6 in. \n(572 × 701 x 522mm)
- Net Weight
- 49.3 Ibs. (22.4 kg). Shipping weight: 60.34 Ibs. (27.4 kg)
Manufacturer's Description — REL Acoustics
A Modern Classic with Vintage Soul, Warm, Deep, and Effortlessly Musical.Classic 99 enriches any system with warm, textured bass that unfolds gracefully into the room. Its acoustic-suspension design delivers natural ease and beautifully layered tone.
- Smooth, controlled dynamics from a 450-watt Class D amplifier
- Warm, natural timbre from a 12" pulp-on-paper driver
- Fast, balanced response from an acoustic-suspension cabinet
- Rich walnut veneer for a timeless, furniture-grade finish
Nothing Continues to Say Lifestyle like Mid-Century Modern RELs
Classic 99
Classic 99 extends our Classic Line to loftier heights. Richer, bolder, and more powerful? Certainly. Yet 99 is also capable of far greater nuance, air, and resolution than its lesser brethren. For those with more capable systems and larger rooms, Classic 99 delivers advances on every front, while still maintaining the same easy-going, room-filling nature all Classic offerings possess. The high-grade genuine dark walnut veneer complements a variety of decors. Classic 99 delivers this in the same simple, comforting form of Mid-Century Modern design. Perfect for those who welcomed the original, yet were waiting for the next chapter to be written, those who crave even higher performance and the ability to fill larger, grander spaces with a broad carpet of deep bass. You’ll still want to put on a record, pour a favorite drink, sink into your favorite chair, and relax into the music or movie of your choice. Classic 99, for those who waited for more.
Classic 99 extends our Classic Line to loftier heights. Richer, bolder, and more powerful? Certainly. Yet 99 is also capable of far greater nuance, air, and resolution than its lesser brethren. For those with more capable systems and larger rooms, Classic 99 delivers advances on every front, while still maintaining the same easy-going, room-filling nature all Classic offerings possess. The high-grade genuine dark walnut veneer complements a variety of decors. Classic 99 delivers this in the same simple, comforting form of Mid-Century Modern design. Perfect for those who welcomed the original, yet were waiting for the next chapter to be written, those who crave even higher performance and the ability to fill larger, grander spaces with a broad carpet of deep bass. You’ll still want to put on a record, pour a favorite drink, sink into your favorite chair, and relax into the music or movie of your choice. Classic 99, for those who waited for more.
Designed to Be Superior
Classic 99 adopts the form language introduced in its model 98 stablemate. As comfortable as a pair of well-worn loafers, it features solid cabinet walls as thick as 32 mm, clad in rich, warm walnut veneer, hand fitted with care. The simplest of natural aluminum badges and softly radiused feet milled from solid billet, blacked out to allow it to seemingly float, ensure that nothing, not even a grille disturbs the vibe. Yet, as with all RELs, the styling conveys far more than simple comfort. The down-firing 12” driver, while unseen, will surely be felt. Continuing to the rear panel, one finds the period-correct detailing extends to the amplifier panel, where all controls are finished in lovely white gold. Everything that one encounters has the heft of quality switch gear, even the click made by the phase switch is near perfection. Quality abounds everywhere one looks or touches. Don’t be surprised if your children fight over it later in life.
Driven to be Louder. And Quieter.
As anyone familiar with REL will tell you, we always begin with the driver. In this case, a bespoke 12” long stroke driver that uses lightweight, stiff, hot-pressed paper to form the main body of the cone. Laid atop that is a stiff center cap made of hand-thrown paper; to randomize the fibres, ensuring that the driver has excellent self-damping. This is one of REL’s secrets. Understanding that it is the quietness, that attention to bring the driver to complete silence, that produces the most startling dynamics. Whilst Classic 99 will play shatteringly loud, it’s from the very black background that the loudest dynamics emerge to produce the sense of shock sought by great composers and directors.
More than Ample Amplification
Classic 99 is big, bold, and full of character, similar to the Stentor II of our youth, but at one-third the price. Of course, the 99 has a great amp. In order to generate deeper bass and significantly higher output, we turned to a tried-and-true Class D amplifier that we’ve already used in thousands of previous units. This 450 watt amplifier is fed by an all analogue PerfectFilter front end that extends useful output well into the low 20 Hz range - superb for a design of this size and price. It produces a sound that’s both rich and richly detailed at the same time. Classic 99 borrows the best from current technology to deliver a sound slightly warmer and more like what we all imagine vintage sound to be, with superior reliability and performance than was ever available back in the day.
The Freedom of Clean Connection
The future meets the past in REL Acoustics wireless offerings, now centered on HT-Air MKII Wireless. Designed for seamless integration, it supports Left or Right Low Level Connection or .1/LFE. High-Level Connectivity is not supported with the HT-Air MKII.
Operating on a 5.8 GHz platform, HT-Air MKII delivers uncompressed, stable wireless performance with carefully engineered front-end components for maximum signal integrity. The result is clean, reliable transmission without cable clutter, preserving both sound quality and living space aesthetics.
It’s a simple, affordable way to bring REL’s trusted wireless performance into more systems—delivering freedom, flexibility, and purity of connection.
Verified Dealers
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Authorized dealers for REL Acoustics Classic 99
- The ASOC Gallery of Fine Audio — in-store — Stratford, Ontario, Canada (website)
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- 3mA Audio — online and in-store — Houston, Texas, United States (website)
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- Acoustic Streams — in-store — Lower Drift, England, United Kingdom (website)
- Acoustica — online and in-store — Chester, England, United Kingdom (website)
- All Elite Audio — online and in-store — Perry Hall, Maryland, United States (website)
- Alta Fedelta — online and in-store — Lombardia, Italy (website)
- American Sound — in-store — Richmond Hill, Ontario, Canada (website)
and 239 more verified dealers