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SERIE T

Tzero MKIII

$599

Small Size. Serious Performance. True REL DNA.
Tzero MKIII brings fast, expressive bass to intimate environments perfect for offices, apartments, studios, and smaller living spaces.

Clean, controlled low frequencies from a 100-watt Class D amplifier
Speed and precision from a 6.5" aluminum driver
Tight, natural sound via an acoustic-suspension cabinet
Rigid, low-resonance construction with internal bracing

Color:Black

Black
White

Setup:One Subwoofer

Single Subwoofer
Stereo Pair

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3 Year warranty

60 day trial & free return

60 day Price Protection

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Tzero MKIII

Single Subwoofer
Black

$599

Miracle In Miniature

Tzero is, in many ways, the most difficult design we have ever executed because never before have we delivered so much for so little. Five coats of your choice of black or white high gloss lacquer as in all Serie T, NextGen Class D amplifiers, our famous High Level Input, plus a separate .1/LFE input stage with its own volume control to get theatre levels AND music perfect without racing to adjust or looking for a remote control.

The jewel of the MKIII is the new aluminum-coned driver, a rugged 6.5” unit with exceptional output and low bass extension for its size. While it won’t drive medium or large rooms hard, we make plenty of larger models that handle that task, Tzero MKIII remains a miracle in miniature

Tzero is, in many ways, the most difficult design we have ever executed because never before have we delivered so much for so little. Five coats of your choice of black or white high gloss lacquer as in all Serie T, NextGen Class D amplifiers, our famous High Level Input, plus a separate .1/LFE input stage with its own volume control to get theatre levels AND music perfect without racing to adjust or looking for a remote control. The jewel of the MKIII is the new aluminum-coned driver, a rugged 6.5” unit with exceptional output and low bass extension for its size. While it won’t drive medium or large rooms hard, we make plenty of larger models that handle ...
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Design

Scaled for the Simple Life

At REL every design begins by defining and designing the best bass engine for a given application. With its new aluminum-coned long throw 6.5” driver, the MKIII is powerful and articulate, delivering surprisingly deep bass. Able to fill smaller spaces effortlessly. Have a much larger space? Turn to one of our larger models, there are plenty to choose from.

Driver

Outsized Performance

At REL every clean sheet design begins by defining and designing the best bass engine for a given application. While the long throw 6.5” is our smallest-to-date, but make no mistake it is powerful and articulate, able to fill medium-sized rooms effortlessly. Have a much larger space? Distribute them throughout for an unobtrusive spacious presentation of music and film sound.

Amplifier

Brains & Brawn

Though Tzero MKIII is REL’s entry level, that doesn’t mean it can’t punch far above its weight class. 100 high-current watts from a NextGen Class D amp means it holds its head high and is capable of delivering many years of satisfying performance. We feature the same high-quality input filters, crossovers and limiters as our larger models. Tzero MKIII includes a full REL connectivity suite, fast 8ms delay filter set and our famed High Level Input as well as a separate .1/LFE input with its own level control and a standby circuit that reliably comes alive at very low levels.

Specifications

Technical Specifications

Type

Closed Box, down-firing driver

Active Driver Size & Material

6.5in. (165mm) long-throw, aluminum cone, steel chassis

Passive Radiator Size & Material

N/A

Low Frequency Extension

-6dB at 37 Hz Low Frequency

Input Connectors

High Level Neutrik Speakon, Low Level (1) RCA, (1) LFE RCA

Output Connectors

N/A

Power Output

100 watts (RMS)

Amplifier Type

Class D

Wireless Capability

HT- Air MKII (sold separately)

Dual Parametric Filter

HT- Air MKII (sold separately)

Finish

Piano Black Lacquer, Gloss White Lacquer 5 coats

Protection System

Fully Electronic Set Safe

Yes

D.C. Fault

Yes

Output Short

Yes

Mains Input Voltage

100-240 volts

Fuses

2.00 Amp semi delay

Supplied Accessories

Mains Lead

Yes

Neutrik Speakon

Yes (10 Meters Nominal)

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
8.5 x 9.5 x 10.5 in.
(216 x 241 x 260 mm)

Net Weight

15 lbs. (6.8 kg)

Faq

What are the benefits of adding Tzero MKIII subwoofers to my system?

The REL Tzero MKIII delivers musical bass in an ultra-compact footprint. With a 6.5" forward-firing driver and a 100-watt Class D amplifier, it’s perfect for small spaces, desktops, or systems where discretion and detail matter more than sheer output. It brings REL’s signature speed and clarity to entry-level audio systems in smaller rooms.

Can Tzero MKIII be used in both music and home theatre systems?

The Tzero MKIII is designed primarily for 2-channel music systems however it has a LFE input to for compact home theater setups. This unit goes down to 40Hz so this model isn't going rattle your foundation but it will add texture and impact to low-frequency effects. It’s best suited for smaller spaces where clarity and tight bass are preferred over deep cinematic rumble.

Can the Tzero MKII be integrated with other REL subwoofer series?

Yes, the Tzero MKIII can be paired with other REL subwoofers. For mixed-series integration, Tzero MKIII works well with T/5x of Serie HT.

What size room is ideal for Tzero MKIII?

The Tzero MKIII is ideally suited for small rooms up to 150 square feet, making it a perfect choice for bedrooms, home offices, or compact apartment living areas. It’s designed to deliver exceptional sound quality in spaces where every inch counts.

Can I stack Tzero MKIII in a line array configuration?

While Tzero MKIII is not designed for vertical line array stacking, it excels when used in stereo pairs or dual-sub setups.

Awards & Industry Reviews

“I can say without a doubt that these tiny REL’s excelled in becoming one with my monitors in a way I’d never really experienced prior…. Overall I fell in love with these little REL’s. They’re small, WAF (Wife Acceptance Factor) friendly, and in the right circumstances would be all you’re looking for in a two channel system.”

- Everyday Audiophile

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Outstanding Product

I have always felt a subwoofer points to a deficiency in the main pair of speakers, this, again, is not the case. I feel as if the subwoofer makes speakers more efficient and in the case of these two REL Tzero MKIIIs they are supporting the soundstage handsomely, without becoming too overbearing.

- HiFi and Music Source

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"I think the Tzero MKIII is a serious over achiever...the fact that it's so freaking tiny and beautifully finished, you could just tuck it away anyway. It has a lot going for it and it comes highly, highly recommended"

- Steve Gutteberg, The Audiophiliac

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"I've enjoyed my time with this subwoofer. It was quite surprising in a lot of ways. I did not expect the things it did and the ways it delivered it. I think at the end of the day, in the right hands, for the right customer, I could see people saying that's the best $500 I ever spent."

- Nemo Propaganda

- Nemo Propaganda

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"tu nuevo botón de "loudness" protege tus oídos! "

- De Audiofilos y Locos

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"The Tzero III acquitted itself really well. It’s tiny, but that doesn’t stop it adding useful low-end grunt to speakers up to, say, £1,000. It also opens up their soundstage notably, a benefit that shouldn’t be underestimated. "

- HiFi Starters Club

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View Tzero MKIII in Your Space

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What's in the box

Serie Tzero MKIII Subwoofer
Grille
6' AC Power Cord
32' Neutrik Speakon Cable
User Manual & Warranty Information
Important Safety Instructions

Download User Manual

The Right REL for You

Specifications will never tell the whole story behind one of our subwoofers, but they can help to clarify the technical difference between them.

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

SERIE T

Tzero MKIII

$599

W x H x D
8.5 x 9.5 x 10.5 in.
(216 x 241 x 260 mm)

100 watts (RMS) Class D

N/A

-6dB at 37 Hz Low Frequency

SERIE HT

HT/1003 MKII

$699

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

300 watts (RMS) Class D

-6dB at 24 Hz Low Frequency

Compare More RELs

Overall rating: 4.979798 / 5 from 99 reviews.

AI Generated Review Summary

The Tzero MKIII offers powerful, natural bass in a compact form, praised for its excellent sound quality, seamless integration, and convenient size. Customers appreciate its clear connection and amazing performance, making it a great value for money.

Summary topics

REL TZero Performance: 13%
Product Quality: 6%
REL Performance: 9%
Product Connection: 5%
Product Size: 5%

Review topics: [].

Review highlights

"The REL is beautiful on the outside and pure quality performance." — R. Y.
"No muddy sounds, the Tzero blends perfectly." — Ted H.
"The connection and tuning videos are clear and helpful." — Tim B.

Reviews

Excellent

"We love the Tzero, Compact with impact. We are not worried about cinema effects but we do want to try and mirror the sense of being in the concert hall. The Tzero really helps with that. Indeed we bought a second one! Equally we think that the customer support at REL is second to none. We were trying to decide between this and a T/5x and Ben in Bridgend spent so much time talking it through with us. Cannot thank him and his team enough."

— Jennifer M. (5/5)

Multiple T-Zeros. Do not let size fool you.

"Long story, but I saw a few car audio videos where they used multiple little woofers in a series and the sound was so smooth and tight. So, why can't I do this in my home audio setup? Well, I started with a pair of the T-Zeros, then I picked up another pair for my two channel rig. I added the miniDSP to handle the crossover and REW to tune everything in. The sound is amazing! Much better than anything my pair of SVS SB3000 subs could produce. Very happy!"

— Mike W. (5/5)

Great tiny sub for my KEF LSX II LT speakers

"Working pretty good with a pair of KEF LSX II LT in a small office room. So far I'm liking it. Still tweaking with some settings, but overall I'm loving it. It improves the overall sound coming out of the small KEF speakers. I'm not a base head, all I wanted was for the sound to be more rich and complete. Main reason I went with REL was for the incredible compact size - that was the decisive factor for my purchase and why I was willing to pay the otherwise higher price."

— Alexandru R. (5/5)

TZero MKIII

"An excellent and necessary addition to my sound system. Currently run to B&W’s 805D3’s with McIntosh 275 and McIntosh c2500 tube amplifier and preamplifier. Couldn’t believe the sound!"

— Arissa M. (5/5)

High quality sound

"Excellent Sub, I had a follow up phone call from REL once my Sub arrived. 10/10 for product and support"

— Paul A. (5/5)

Great Subwoofer for smaller spaces

"Great subwoofer if you’re looking for something that’s going to fill the missing piece in your setup. I got this to pair with a Pro-Ject Debut Carbon Evo and Kanto Yu4 bookshelf speakers in my bedroom. It provides that perfect extra kick without being overpowering in the slightest. If you’re in a smaller room and need something to fill that gap in bass you’re missing this it it."

— Caelan S. (5/5)

An amazing subwoofer

"Yeah, it's small. Yeah, it looks like a toy. It's not! I have a Bluesound POWER NODE, with a pair of B&W LM1s connected. While the LM1s sound very good, they have no useful output below 70Hz. The TZero fills that void perfectly in my small-ish living room. The LM1s open up nicely, and now there is palpable bass energy throughout the space. Simply an amazing subwoofer."

— Orlando C. (5/5)

So far so good

"Enjoying this product so far. Has transformed my bookshelf speakers for music - after tuning the settings I found an optimal setting that gives more weight and warmth to the sound without the bass dominating (as it should be). Small size very convenient for small rooms like mine."

— Michael L. (5/5)

T Zero Mk III Subwoofer

"I bought this subwoofer to fill out the bottom end of my powered, Little British Monitors Mk II speakers, and have not been disappointed. The monitors are transmission line speakers, and so reproduce bass disproportionately well for their size, but the 75 mm mid/woofer driver could never hope to cover the lowest lows. The T Zero Mk III blends in seamlessly with the LBMs using their dedicated RCA sub out. I could not be happier. Together they make for a great speaker system."

— Michael S. (5/5)

What A Difference A Pair Makes!

"Here in my 9' X15' office I listened with quality stand mounts and a single Tzero MKIII. I thought, why not a second Tzero MKIII? Wow! what a difference a pair makes. My small office, mostly lower volume listening, blossomed with a second REL sub. Tzero is all I needed, but a pair made it magic."

— Mike S. (5/5)