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SERIE HT

HT/1205 MKII

$799~~$899~~

The HT/1205 MKII redefines performance for budget-friendly home theater subwoofers, delivering unmatched power and precision.

500-watt Class D Amplifier
12" CarbonGlas™ Driver
Body is finished with a line-grained composite
Home Theatre Ready

color:Black

Black
White

Setup:One Subwoofer

Single Subwoofer
Stereo Pair

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HT/1205 MKII

Single Subwoofer
Black

$799~~$899~~

Rethink What's Possible

Serie HT is designed specifically to answer the challenge of creating affordably priced, exceptionally dynamic, pure home theater powered subwoofers. The HT/1205 MKII is the ideal combination of a lightweight, modern 12” CarbonGlas™ (300mm) driver coupled to a powerful 500W Class D amplifier that runs cool, producing extraordinary dynamics. Internally, we developed specially adapted home theater input filters that produce extremely flat bass down in the 20’s.

We set out to build the loudest, relatively compact 12” unit available for pure home theater use, and at truly attractive pricing. You’ll be the judge of how well we accomplished that goal, but critics are already lining up for reviews. We believe the HT/1205 MKII is destined to become a modern classic with svelte cabinet dimensions finished in an attractive, yet purposeful line grained black aluminum-look and topped by a 12mm thick beautifully polished top that serves to damp vibrations on the critical top surface of the cabinet.

For REL owners already enjoying our Reference, Serie S and T/i subwoofers designed for both 2-channel and theater use, the HT/1205 MKII is designed to supplement their system’s .1/LFE output to produce extremely high output for chest rumbling home theater special effects.

Design

Designer Exterior

The beautiful new cabinetry is bespoke; it has new textures, proportions, and finishing touches previously unseen in the category. Lower, sleeker cabinetry borrows proportions drawn from our new Reference models. Over the years, our experiments have established that this results in a faster, deeper presentation of bass—all while looking smashing. Your eye is immediately drawn to the top panel, whose entire surface finished in 5 coats of hand-polished piano black lacquer. A discreet REL logo floats within the top layer of lacquer whilst the body of the cabinet is clad in horizontally streaked, line-grained composite. The entire affair looks expensive, bespoke, and tastefully restrained. Additionally, you can stylishly combine it with either Serie T/x or Serie S in large, fully-immersive REL HT/3D™ setups.*

Driver

Drive Like You Mean It

The HT/1205 MK II’s driver is a 12” (300mm) CarbonGlas™ construct as it has always been, but all its components were beefed up. It is improved in both large and small ways, enabling it to deliver the greatest performance possible. Lightweight, stiff, and quiet, the combination of glass fibre primary cones with true carbon fibre centre caps results in a cost-effective yet pistonic cone. Larger, more powerful magnets produce more energy. Upgraded suspension designs control the HT/1205 MKII’s output all the way out to the limits of both the amplifier and the driver. The result is crazy output, while the HT/1205 MKII remains fast and liquid.

Amplifier

Now Hear This!

Amplifiers do the heavy lifting in a theatre subwoofer. We turned to a true tier one amp supplier to build our latest design for us—they did not disappoint. They included thicker boards, upgraded the power supplies, and did all the stuff that results in a brutally powerful amp with remarkable longevity. Additionally, the MOSFET power modules rated at 800 watts mean this amp is just cruising at its 500-watt rating. It produces truly awe-inspiring sound. While the theatre gets all the headlines, the HT/1205 MKII’s big secret is that it sounds sublime in musical applications. Big and robust-sounding, it is sure to become an instant classic.

PerfectFilters™: Where it All Starts – Amplifier

REL input filters are renowned throughout the audio world. They bring together ultra-fast crossovers, elevation filters that extend the flatness of deep bass, and explosive-sounding integrated limiters. This compact series of analogue circuits is REL’s secret recipe in both music and film sound. Refined in this second generation, the secondary filters are much higher in frequency; they make the rarefaction of air in the sound of an explosion to feel that much more realistic. Also, our latest circuit includes an all-analogue subsonic filter that begins as low as 8 Hz to minimize the effects of infra-noise from soundtracks that extends well below the resonance point of the driver. The result is incredible delivered power with the ability to play all the way to the driver’s limit without distortion.

Wireless

Wired For Sound: HT-Air

Wired for sound used to entail long runs of cable strewn across the floor. With our optional HT-Air™, great sound has become “un-wired.” Wire has been replaced by a tiny transmitter and matching receiver that sends an incredibly fast 5.8Ghz wireless signal up to 60 feet with no digital compression. This affordable circuit includes the same LSIC chip that powers our state-of-the-art AirShip II, minus the expensive analogue-to-digital and digital-to-analogue (DAC) convertors. The HT-Air is perfect for the .1/LFE signals using RCA connectors that are HT/1205 MKII’s primary mission.

At 6 dB louder than any previous REL within 50% of its price, the original HT/1205 was a remarkable value.

Specifications

Technical Specifications

Type

Closed box, front-firing driver

Active Driver Size & Material

12 in. (300mm) long-throw, CarbonGlas™ cone structure, inverted carbon fibre centre cap, steel chassis

Passive Radiator Size & Material

Low Frequency Extension

-6dB at 22 Hz Low Frequency

Input Connectors

(2) Low Level RCA or (1) LFE RCA

Output Connectors

Daisy Chain (2) Low Level RCA or (1) LFE RCA

Power Output

500 watts (RMS)

Amplifier Type

Class D

Wireless Capability

HT- Air MKII (sold separately)

Dual Parametric Filter

N/A

Finish

Horizontally Oriented Lined Grained Black Composite Cabinet, 15mm Top Plate, finished in 5 coats of Hand rubbed High Gloss Black Lacquer

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

4 Amp semi delay 230b, 4 Amp semi delay 115b operation

Supplied Accessories

Mains Lead

Yes

Neutrik Speakon

Interconnect

User Manual

Yes

In the interest of product development, REL Acoustics Limited reserve the right to vary these specifications without notice.

Dimensions

DIMS

W x H x D
16.25 in. x 15.25 in. x 17.25 in.
(413 x 387 x 438mm)

Net Weight

43.2 lbs. (19.6kg)

Faq

What are the benefits of adding the HT/1205 MKII to my system?

The HT/1205 MKII is engineered to deliver deep, tactile bass for home theater—but as a REL, it also must excel with music. To meet that standard, it features a 12" CarbonGlas™ driver, ultra-fast filters, and a 500W Class D amplifier, resulting in a subwoofer with impressive speed and authority down to 22Hz. Compact in size but big on performance, the HT/1205 MKII brings rich textural detail and deep low-end impact—perfect for both cinema and music systems.

Can the HT/1205 MKII be used in a music system?

While its strength lies in cinematic effects, the HT/1205 MKII also delivers exceptional value for music systems. It digs deep, plays loud, and offers rich texture—making it an ideal match for mixed-use systems that rely on the subwoofer output.

Can the HT/1205 MKII be integrated with other REL subwoofer series?

Yes, the REL HT/1205 MKII can be integrated with other REL subwoofer series, particularly when used in a multi-subwoofer setup. For best results, it’s ideal to stay within the Serie HT family for consistent voicing and performance. It works beautifully with the Serie T/x —if configured thoughtfully tuned for balance and blending.

Is the HT/1205 MKII compatible with wireless systems?

Yes, the HT/1205 MKII is fully compatible with REL’s HT-Air MKII Wireless system, delivering zero-compression audio and low-latency performance—ideal for clean setups without the hassle of cables.

What room size is the HT/1205 MKII ideal for?

The HT/1205 MKII is a high-output subwoofer capable of digging deep into the lower 20Hz range. Incredibly versatile, it can easily pressurize small to medium-sized spaces. Rooms up to 400 square feet are ideal for the HT/1205 MKII to deliver clean, controlled, and powerful bass.

Can I stack HT/1205 MKII subwoofers in a line array?

No, the HT/1205 MKII is not designed for Line Array stacking, and we do not recommend using it in that configuration. However, adding additional HT/1205 MKII units is ideal for stereo pairs or building a REL 3D theater system. For users interested in vertical stacking, we recommend exploring the HT/1510 Predator, Serie S, or Reference models.

Awards & Industry Reviews

Recommended

"The power the REL Acoustics HT/1205 MKII brings to music and home entertainment systems is remarkable at the price. The 500W power output rating really does seem under-specified as this potent performer will easily drive medium-sized rooms without breaking a sweat, and there’s plenty in reserve to drive even larger rooms should circumstances require."

- Audiograde

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Recommended

"The HT/1205 MKII is yet another fantastic sounding subwoofer from REL’s Serie HT. It’s attractively designed with a gorgeous CarbonGlas driver that should see the grille left firmly in its box. Its relatively unobtrusive dimensions mean the REL could grace an owner’s living room without drawing too much attention to itself. What’s more, the HT-Air was a revelation in ease of use. It took seconds to set up and did away with the need to hide unsightly wiring."

- avforums

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Best of 2022

"Back for 2022, REL takes the subwoofer top spot again for value, integration and build quality. The HT/1205 MKII will make a welcome addition to any bass light system without getting in the way, to simply enhance the low frequencies as required without fuss or favour."

- Audiograde

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Best Subwoofer Solution

"The REL HT/1205 MKII is another beautifully built subwoofer from REL’s Serie HT line of home theatre-aimed subwoofers. It delivered an authoritative low-end performance, with a highlight being its ability to reproduce punchy, tactile bass impact. It will not plumb subterranean ultra-low frequency depths, but that doesn’t reveal itself at normal listening levels."

- avforums

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Recommended

"If you're looking for power and attack this classy
subwoofer is the kind of high-calibre artillery you should add to your home cinema arsenal."

- Home Cinema Choice

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"If you’re looking for a classy subwoofer that boasts muscular delivery and percussive attack when handling today’s blockbuster movies the HT/1205 MKII is the kind high-calibre cannon that will blast your home cinema with a broadside of bass."

- Sound Advice

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Best Subwoofer Solution 2023/2024

"The REL HT/1205 MKII and HT-Air make a fantastic, living-room-friendly combination, that is capable at times of startling bass transients."

- avforums

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The sexy new black lacquer top plate has a subtle REL logo floating on top, while the expensively wrought black line-grained composite for the cabinet looks the business. HT/1205 MKII plays 50% louder than its predecessor, while also delivering more precision and subtlety. It is capable of output levels more commonly found in models well over $1,000/£1,000. Fantastic for music and available HT-Air rounds out a perfect offering.