Big-Cinema Performance. Compact Footprint.HT/1205 MKII brings fast, controlled theater bass to any room, powerful, compact, and beautifully understated.

• Punchy, controlled bass from a 500-watt Class D amplifier
• Deep, accurate response from a 12" CarbonGlas driver
• Clean, modern aesthetic with a line-grained composite cabinet
• Exceptional theater output for its size and price

• Black
• White

• Single Subwoofer
• Stereo Pair

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Bring the Theatre Home

High-Impact Home Theater, Perfectly Balanced

Designed specifically for pure home theater, HT/1205 MKII delivers explosive dynamics and clean, controlled bass that feels instantly cinematic. It brings scale, impact, and excitement into your space, powerful enough to thrill, yet refined enough to stay composed.

Inside, HT/1205 MKII is engineered for speed, control, and effortless impact, creating bass that feels tight, confident, and perfectly integrated with the rest of your system. Every moment lands with clarity and intention, enhancing immersion without drawing attention to itself.

Finished in REL’s purposeful cabinet design and available in both Black and White, HT/1205 MKII combines compact dimensions with a rigid, vibration-damping structure. A lightweight 12” CarbonGlas™ driver and high-current 500W Class D amplifier work together to deliver fast, authoritative bass, while specially developed home theatre input filters keep performance flat and controlled deep into the 20Hz range. For systems already anchored by REL’s Reference, Serie S, or Serie T/x subwoofers, it integrates seamlessly as a dedicated .1/LFE solution, adding cinematic weight without changing the system’s character.

Designed specifically for pure home theater, HT/1205 MKII delivers explosive dynamics and clean, controlled bass that feels instantly cinematic. It brings scale, impact, and excitement into your space, powerful enough to thrill, yet refined enough to stay composed.

Inside, HT/1205 MKII is engineered for speed, control, and effortless impact, creating bass that feels tight, confident, and perfectly integrated with the rest of your system. Every moment lands with clarity and intention, enhancing immersion without drawing attention to itself.

Finished in REL’s purposeful cabinet design and available in both Black and White, HT/1205 MKII combines compact dimensions with a rigid, vibration-damping structure. A lightweight 12” CarbonGlas™ driver and high-current 500W Class D amplifier work together to deliver fast, authoritative bass, while specially developed home theatre input filters keep performance flat and controlled deep into the 20Hz range. For systems already anchored by REL’s Reference, Serie S, or Serie T/x subwoofers, it integrates seamlessly as a dedicated .1/LFE solution, adding cinematic weight without changing the system’s character.

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.*

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.

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.

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.

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.

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.

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.

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.

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.

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.