Serie T/i

$599 $549

Smaller does not mean lesser. We designed the compact T/5i to give smaller sized spaces and systems equal quality sound, so while scale may change the performance stays the same.

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Purity Reimagined

Stunningly Simple

Simplify, Then Add Lightness: Simplicity is its own reward and T/5i reduces the classic cubic sub to its bare essence. A single, high quality AlloyFibre™ composite driver and down firing orientation produces maximum coupling with the floor and eliminates the need for a grille. T/5i is the purest expression of REL.


Reinforced Simplicity

A 360-degree Upgrade

When we upgraded our drivers, we were forced to redesign outward. The lovely cabinets grew over its predecessor due to thicker cabinet walls and improved bracing. Why? Because the additional speed and impact of the new drivers requires greater control or the benefits can be lost before they get to the listener.


Faster & Deeper


We began by updating our classic 8” bass engine to reduce mass, while greatly increasing stiffness. This improvement led to upgrading cabinet dimensions and wall thickness to better control the deep bass. Additional upgrades extended even into the design of our feet, resulting in greater speed and solidity to the presentation of sound.


Proven Power

REL's Reliable Brains And Brawn

REL’s electronics are the brains and power behind our success. Serie Ti uses the same Class A/B power amplifier sections with large, high current power supplies, precision-wound transformers and an amazing reliability record that has powered some 100,000 RELs. Standby Mode switch not included on 110V units.


Zero Compression Wireless

Introducing Arrow™

Arrow™ is REL’s latest generation of zero compression wireless. Super-fast delivery of both High Level Bass and .1/ LFE ensures the rich, natural warmth that only RELs can deliver. With a throw distance of some 45’(13.7M) Arrow permits flexible placement without sacrificing sound quality.

Customer Reviews

Based on 73 reviews
great fit

I have had a pair of the new Sonus faber Lumina 1 for about 4 months now and they are delightful but a very small speaker. They are very fast and clean with solid punchy bass powered by the really capable Denon PMA 600NE. The bottom was missing though so I looked into REL and chatted with a friend who has this sub, he said I would not be let down and he was right. The sub blends in perfectly with the speakers, it is not there but it is there. The sub is fast and completes the scene and to be honest I really have not moved it around and experimented with placement yet and also not even using the high level connects, can it get much better?

Dead on arrival

I really wanted to like this subwoofer but it came in dead out of the box. The same amp and the same setup worked just fine with my Polk sub. Sent it back the next day and still waiting to get my refund.

Absolutely Flawless

Paired the T/5i with a pair of Audio Engine HD6 book shelf speakers. It blends flawlessly with them. Watching TV and movies sound excellent. Music however, is superior, especially from the Rel. The details I can hear from the Rel are absolutely stunning. I have a Large 7.2 home theater setup with bi-amped front towers, 2 15" subs, rear towers, large center channel, and heights. It is great for making movies and music LOUD! However, my experience with the Rel, I actually prefer to listen to music on the small system. It plays detail that I cannot hear from my large system. I have heard alot of Subwoofers, none have matched the clarity that this Rel has. If you want musical detail in the low end? Look no further, buy a T series Rel and surrender you ears to audio bliss.

Great little Sub

This little guy completes my system perfectly. I’ve had these Focal Micro Utopia Be speakers for more than a decade but I was always missing the low frequencies... until now. This sub is a perfect match for these high end speakers and I was totally surprised by the results when I hooked it up to my Conrad-Johnson amps. My system sounds so good now with the addition of this very inexpensive Sub. I am dialed in like never before.
I have tried other subs but they didn’t work nearly as good as this T/5I. And the other Subs I tried were more than twice the price of this little gem. I am so happy with the results of finding and adding this little guy to my system. Thank you REL !!!

T5i amazing

Couldn’t be happier with the Rel T5i. It makes my B&W speakers sound better than I could have ever imagined. Integration was super easy and the sound is fantastic. My room is 18x12 and the T5i provides more than enough bass for the space.


Suggested Retail: $599 $549

Smaller does not mean lesser. We designed the compact T/5i to give smaller sized spaces and systems equal quality sound, so while scale may change the performance stays the same.

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