SERIE HT

HT/1003 MKII

$699
Final Sale

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
color:White
setup:One Subwoofer

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[year] Year warranty3

3 Year warranty

60 day trial & free return

60 day trial & free return

60 day Price Protection

60 day Price Protection

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HT/1003 MKII
  • Single Subwoofer
  • White
$699
White
Single Subwoofer

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 compac...
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Design

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.*

Driver

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.

Amplifier

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.

Wireless

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.

Specifications
Technical Specifications
Type

Closed box, front-firing driver

Active Driver Size & Material

10 in. (250mm) long-throw, CarbonGlas cone structure, inverted carbon fibre centre cap, steel chassis

Passive Radiator Size & Material

NA

Low Frequency Extension

-6dB at 24 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

300 watts (RMS)

Amplifier Type

Class D

Wireless Capability

HT- Air MKII (sold separately)

Dual Parametric Filter

N/A

Finish

Horizontally Oriented Line Grained Composite, 15 mm Top Plate, finished in 5 coats of hand-rubbed high gloss 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

6.3 Amp semi delay 230 or 115 volts operation

Supplied Accessories
Mains Lead

Yes

Neutrik Speakon

NA

Interconnect

No

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
14.25 in. x 13.25 in. x 15.25 in.
(362 x 343 x 387mm)

Net Weight

34.2lbs. (15.5kg), shipping weight 41 lbs. (18.6 kg)

Faq
What are the benefits of adding the HT/1003 MKII to my system?

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

Can the HT/1003 MKII be used in a music system?

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.

Can the HT/1003 MKII be integrated with other REL subwoofer series?

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.

Is the HT/1003 MKII compatible with wireless systems?

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.

What room size is the HT/1003 MKII best suited for?

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.

Can I stack HT/1003 MKII subwoofers in a line array?

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.

Awards & Industry Reviews

Home Cinema Choice
Recommended

"The HT/1003 MKII isn’t a heavyweight sub, all blunt-force trauma and no finesse; instead it's a middleweight with nimble feet and powerful jabs." - Home Cinema Choice

- Home Cinema Choice

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"The HT/1003 MKII is just on another level. Great sub. I love it. Potential Product of the year. I don't care what descriptor you want to use for sound quality, the HT/1003 MKII is going to be very, very, very difficult to beat.."

- Nemo Propaganda

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HT/1003 MKII
HT/1003 MKII
HT/1003 MKII

View HT/1003 MKII in Your Space

What's in the box

  • Serie HT/1003 Subwoofer
  • Grille
  • 6' AC Power Cord
  • User Manual & Warranty Information
  • Quick Start Guide
  • Safety Information

The Right REL for You

HT/1205 MKII
SERIE HT

HT/1205 MKII

$999
W x H x D
16.25 in. x 15.25 in. x 17.25 in.
(413 x 387 x 438mm)
500 watts (RMS) Class D
NA
-6dB at 22 Hz Low Frequency
T/5x
SERIE T/x

T/5x

$799
W x H x D
11.8 x 12 x 12.3 in.,
(300 x 307 x 313 mm)
125 watts (RMS) Class A/B
N/A
-6dB at 32 Hz Low Frequency
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Overall rating: 5.0 / 5 from 18 reviews.

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Reviews

So Happy!

"After being an audiophile since 1973 I have owned many subs and never was satisfied with any! I never could get one to integrate correctly and they all sounded bloated. I thought try it one more time so I did. This REL blended into my system seamlessly in about 30 minutes of adjustment. The plight of this sub is not to give you black eyes but to bring up the bottom end to enhance full range possibilities. Very nice build, fair prices, great sound. Don’t blow money on other brands. Just get a REL!"

Larry S. (5/5)

2nd Rel ht1003 Subwoofer

"One year ago I bought my first Rel ht1003 Subwoofer and I loved it I own a few different ported subwoofers and I thought they was okay at best and I tried this one and I finally heard what bass should be then I finally went ahead and got a 2nd Rel ht1003 Subwoofer and I expect it to be even better but I have to say this even pass my expectations I do movies and music evenly and I love it plus I want to say this help the next person I have a Marantz Cinema 70s and I was told to keep the subwoofer trim level on negative 5 to negative 11 I did that until Rel acoustics said to put it on zero or very close it will sound better and they was right it is far far better than I had it"

Josh P. (5/5)

What the Rel!!!! Wow!!!

"Man let me tell you!!!!! The BASS that this gem puts out is fantastic!!!! Not muddy or boomy. Tight bass too! It is also designer friendly!!! I like the glossy top but you have to wipe down with a micro cloth. I am satisfied with my Rel sub!!!"

Paul D. (5/5)

9-Month update

"This is just an update. I bought this ht10 in 9 months ago and I want to give a little update on this product. Don't hesitate to buy it. This is an amazing subwoofer. I have mine turned on 24/7. I don't use the switch to let it go to sleep because I was told that they prefer to leave it on so that's what I did. If you use it daily, mine gets used television and music at least 14 hours a day between me and my family and not once if I've been disappointed. I've got it in a living room that is 20 ft by 25 ft and it fills the room very nicely. Music sounds just beautiful I've owned six subwoofers from four different companies and yes they were fairly decent. But I was never really crazy about a subwoofer especially from music until I got this subwoofer. Now I just can't hear music without a Rel Subwoofer and movies this Little 10-in can really pack a punch. I mean it can't punch like they're predators or they're 12 in. But for a 35 lb 10-in they pack a punch I'll say this. I have it set at 80 DB at reference level for my movies while my speakers are at 75 DB and for music I have it set for 73 DB and it's never bottomed out. It's never gave me trouble. It moves with precision and adjust. Never lose shape. Never lets me down. I highly highly recommend the subwoofer"

Josh (5/5)

Excellent Subwoofer

"I’ve owned a few subwoofers, the most recent being a Velodyne that gave up the ghost after 17 years. This sub sounds incredible. It is a clear, clean sound, and it improves the music / movie environment without overpowering it. I was looking for a clean sound, that wasn’t too boomy, or overwhelming, and this hits the mark perfectly. It has the qualities of an additional speaker that hits the lowest frequencies. It has more volume than needed, and I’m running it under 50% total volume / gain. I’m hearing tones and sounds I didn’t know existed at lower frequencies. If you’re looking for clean sound that improves the music / movie environment, and isn’t boomy, you will be hard pressed to find something better."

G L. (5/5)

A most huggable bass

"I bought this little/big smashing Hammer to pair with a couple of wonderful Acoustic energy AE500s, what a beautiful combo this is. My house is smaller than average and when the music is turned up fairly loud it fills everything with clear clean sound, when I place the back of my hand on a door way down the corridor I can feel the bass vibrations. I had the sub sitting directly on the bare wooden floor and not only would it go for a walk but it would also send vibrations up my desk and legs, this was kind of annoying so I placed several square pieces of carpet underneath, the problem was solved and now the vibes just travel delightfully through the air as they should. I have never owned a subwoofer before and buying this perfectly made REL lets me know that I could never live without one now, music and movies take my appreciation and expectations to a full aural experience. Go REL."

Mam (5/5)

The Rel 1003 MkII, much like an audio submarine!

"I bought this latest REL sub about a year ago, just before Christmas and thank goodness that I did, as I deeply (see what I did there?) enjoyed the last holiday season! I had already been enjoying my Rel T5 since 2014 and had been watching new and old Rel videos to make up my mind about which one to get! I almost went for a 1205 MkII. But thanks to John's comments about how the 1003 MkII is so similar now to the 1205 and just about twice as loud as the previous 1003 model, (plus the fact that my living room really isn't big enough for a 1205, though I could have just squeezed one in if I moved the sofa over here and put the bar and Christmas tree over there!) I'm so glad that I finally settled on the Rel 1003 MkII, because, while the T5 is still admirably performing 'depth plumbing' duties in the right corner, the new 1003 is taking the strain and descending way down into the depths of the audio abyss, we're talking Mariana Trench like depths, over in the left corner! I'm not 100% sure that it's set up totally perfectly, but man! I've never heard anything go so deep as this baby! My music is bigger and the room is much fuller, with audio presence and joy! I've just seen your blog 'Rel vs. no Rel'. Well I'm on your side with this one, as how can anyone live without a Rel? How did we all survive without bass back in the early days of music (like the 1960's?) :) But this throws up a new question, I'm totally satisfied with my room-filling bass now, but how on this good Earth can a sub go even deeper than this? You have so many bigger, deeper models and I just cannot imagine how much further down a sub can go? I know my neighbours don't even want me to consider this question, so I'd better leave it for now, but maybe in the future? If we get a bigger house? But no, enough now. I'm happy and that's all that matters! You don't have enough stars though, I gave it five, but really you should get seven for this model. So well done John and co. You've done it again!"

Gilbert (5/5)

tight arse bass

"Test driving this sealed box sub as a replacement for a direct competitor subwoofer that has developed a bad rattling noise within fhe first year of ownership. This 1003 has the tight bass i like with both my movies and music. it hits hard and gets off the note when it needs to. no sounding like a 1995 S10 minitruck with a cheap band pass box baning down the street. The sound is there. when it needs to move air to feel the alien land after jumping in Quiet Place, it shakes, hits and moves on. when Darth Vader imposes the force on an empirieal officer that screwed up in The Empire Strikes Back or Star Wars, it sustains and you feel as well as hear the force. Only wish REL would offer a trigger on option, and a mat black finish. Otherwise. . . . . NICE, NiCE, Nice! Best of last four subs I have owned or tried. Made the final purchase from a local dealer today."

Cr (5/5)

Fantastic !

"First of all I would like to thank you for the quality of your product ! I am a sound technician and I can say the sound that delivers the REL 1003 is stunning ! Very low, very precise, hyper fast. It’s very discrete also. I like the fact that you don’t "hear" it. The quality and the price are amazing. By the way, I wanted to tell you that it sounds better with LFE without main because the frequencies aren’t added with my speakers. I had some phase issues with the main mode on. I don’t know if it’s clear (it would have been easier in French ^^) The only drawback to me is that, despite the fact it is heavy, it moves when placed on the floor. I put some silicone dampeners under the sub and it solved the problem. Thank you !"

Eric (5/5)

Amazing sub. Amazing value.

"Beware of preconceived notions. My view of Rel was that is was an Elite brand that did in fact make amazing subs, but that you also paid a premium for the name. Well, I was right about the former but wrong about the latter. The value this sub represents is simply astonishing. My Home Theater listening room is 20L x 13W x 8H. Half of one side of the room is open, out to another room. So it's a fairly decent sized area that needs to be pressurized. Most sub companies, including Rel, are generous with "in-home listening trial periods". So I had this HT 1003 MKll, and another well known brands sub in my living room at the same time for a while to compare. The other sub is physically larger, has a 13 inch driver and an amp rated at more than twice the power compared to the 1003. The other sub is also rated to go a little lower in frequency. My test material was 1) Music that I know to have very deep, as well as quick, demanding bass. 2) The opening scene of Blade Runner 2049 (on disc with DTS-HD Master Audio). 3) The 18 wheeler explosion scene in Terminator 2: Judgement Day (also on disc). At loud but sane and tolerable listening levels both subs sounded phenomenal. There was literally no discernible difference between the 1003 and the other brands larger and more powerful sub. Let's be honest, when pushed to extremes the other larger sub would most likely begin to strut it's stuff. But at the area volume that I'm trying to fill and at the medium to high volume levels I'm comfortable with, I was simply blown away by both of these subs. And on those movie scenes I mentioned, both subs easily had the walls shaking without the subs themselves becoming unruly or stressed. So why is the other brand's sub all repackaged up in its box and ready to go back? Because the Rel HT 1003 MKll is plain and simple an unbeatable value. I hope Rel doesn't read this - but this sub is in a performance category that defies it's retail price. If my use case sounds familiar and similar to yours, this is the sub you should get. I'm extremely impressed with this thing- Highly Recommend."

Tom L. (5/5)

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HT/1003 MKII Product Overview

Delivers Twice the Output With Looks to Die For