Small Footprint. Huge Impact. Pure Home-Theater Energy.HT/1003 MKII doubles the output of the original while keeping the speed, control, and detail that define REL performance.

• Clean, authoritative impact from a 300-watt Class D amplifier
• Strong, fast response from a 10" CarbonGlas™ driver
• Modern, understated design with a line-grained composite cabinet
• Exceptional output for small and mid-sized rooms

• Black
• White

• Single Subwoofer
• Stereo Pair

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Big Impact, Smaller Spaces

Compact Power, Cinematic Impact

Designed specifically for pure home theater, HT/1003 MKII delivers fast, impactful bass that brings movies and games to life without overwhelming the room. It’s a subwoofer that feels agile and controlled, adding excitement, scale, and realism while staying perfectly balanced with the rest of your system.

Engineered for speed and precision, HT/1003 MKII produces bass that’s tight, confident, and effortlessly immersive. It enhances every scene with clarity and punch, allowing soundtracks and effects to hit harder while keeping dialogue and detail intact.

Finished in REL’s purposeful cabinet design and available in both Black and White, HT/1003 MKII pairs compact dimensions with a rigid, vibration-damping enclosure. A lightweight 10” CarbonGlas™ driver and high-current Class D amplification deliver clean, authoritative low frequencies, supported by specially developed home theatre input filters that keep bass flat and controlled deep into the 20Hz range.

Designed specifically for pure home theater, HT/1003 MKII delivers fast, impactful bass that brings movies and games to life without overwhelming the room. It’s a subwoofer that feels agile and controlled, adding excitement, scale, and realism while staying perfectly balanced with the rest of your system.

Engineered for speed and precision, HT/1003 MKII produces bass that’s tight, confident, and effortlessly immersive. It enhances every scene with clarity and punch, allowing soundtracks and effects to hit harder while keeping dialogue and detail intact.

Finished in REL’s purposeful cabinet design and available in both Black and White, HT/1003 MKII pairs compact dimensions with a rigid, vibration-damping enclosure. A lightweight 10” CarbonGlas™ driver and high-current Class D amplification deliver clean, authoritative low frequencies, supported by specially developed home theatre input filters that keep bass flat and controlled deep into the 20Hz range.

Designer Clothing

The sexy new cabinetry is bespoke, with new textures, proportions, and finishing touches previously unseen in the category. Lower, sleeker cabinetry borrows proportions drawn from our new Reference models. Through experimentation over the years, we have found that this results in a faster, deeper presentation of bass—all while looking smashing. The eye is immediately drawn to the top panel, which is 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. Also, it can be combined with either Serie T/x or Serie S in large, fully-immersive REL HT/3D™ setups.*

Drive Like You Mean It

HT/1003 MKII’s driver remains a 10” (250mm) CarbonGlas™ construct to keep its overall size reasonable in its role as the powerhouse for slightly more modest spaces. Every component was beefed up—improved in ways both large and small 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 greater energy. Upgraded suspension designs with enlarged surround to permit greater travel means output remains under control all the way to the limits of amplifier and driver. The result is prodigious output for this price point while remaining fast and liquid, as do all RELs.

Amplified Excellence

Amplifiers do the dirty work and the heavy lifting in a theatre subwoofer. We turned to a true Tier One amp supplier to build our latest design for us; they didn’t disappoint. They created thicker boards, and upgraded power supplies—all the stuff that, while not sexy, results in a brutally powerful 300W amp (did you know all RELs are specified as RMS Continuous, just like a big, expensive 300 W monoblock amp?) with remarkable longevity. It generates truly awe-inspiring sound. While its theatre applications get all the headlines, its big secret is that it sounds sublime in musical applications. Big and robust-sounding, the HT/1003 MKII is sure to become an instant classic.

PerfectFilters™: Where Perfection Starts

REL input filters are renowned throughout the audio world. They bring together ultra-fast analogue crossovers, customer-designed elevation filters that extend the flatness of deep bass, and integrated limiters that allow all the power to explode outward. 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 used now allow extension to a much higher frequency, allowing the rarefaction of air in the sound of an explosion to feel that much more realistic. Additionally, our latest circuit includes an all-analogue subsonic filter that begins as low as 12 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 to the driver’s limit without distortion.

Wired For Sound: HT-Air

Being wired for sound used to require long runs of cable strewn across the floor. With our optional HT-Air™, great sound can be “un-wired”—replaced by a tiny transmitter and matching receiver that sends an incredibly fast 5.8Ghz wireless signal up to 60 feet without digital compression. This affordable circuit includes the same LSIC chip that powers our state-of-the-art AirShip II, without the expensive discrete analogue-to-digital and digital-to-analog (DAC) convertors. It is perfect for the .1/LFE signals using RCA connectors that are HT/1205 MKII’s primary mission.

The HT/1003 MKII is compact yet powerful—purpose-built for home theater. It features a 10" CarbonGlas™ driver and a 300W Class D amplifier to deliver fast, impactful bass with authority down to 22Hz. The HT/1003 MKII offers tight, dynamic low-end performance in a space-saving design—ideal for smaller rooms or systems where space is at a premium

Absolutely. Like all REL subwoofers, the HT/1003 MKII is engineered to perform beautifully with music. While optimized for home theater, it enhances two-channel systems and can serve as a dedicated LFE sub in mixed-use or dual-sub setups.

Yes, the REL HT/1003 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/1003 MKII supports REL’s HT-Air MKII Wireless system, delivering zero-compression audio and low-latency performance—perfect for flexible placement without the need for cables.

The HT/1003 MKII is ideal for small to medium-sized rooms. Its compact footprint delivers impressive performance, offering deep bass with clarity and speed for immersive home theater and music experiences. For larger spaces, consider using a stereo pair or stepping up to the HT/1205 MKII or HT/1510 Predator.

No, the HT/1003 MKII is not designed for Line Array stacking, and we do not recommend using it in that configuration. However, adding additional HT/1003 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.