Serie T/i


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 63 reviews
T/5i is more than capable of pairing well with floor-standing speakers

As a rank amateur learning the ropes of high-end audio, I bought this sub (although I probably should have gone for the T/7i) to pair with two floor-standing speakers driven by a Sony str-dn1080 receiver, and the T/5i has completely elevated the sound of both music and movies in a 2.1 set-up. My Pearl Jam FLAC HD files sound stunningly good.

The missing link

Very happy with my T/5i subwoofer combined with my Kef LS50 wireless, the white gloss finish matches the Kef's perfectly, this sub has a very high WAF ! More importantly very happy with the sound, the sub blends in very well, it doesn't draw any attention to itself (I can't stand boomy subs) it gives a very nice weight to the overall sound. I only listen to 2 channel streaming audio, I cant believe I didn't purchase this sub sooner. 2 minor gripes; I cant believe there is no auto shut off when there is no signal and why does the LED on the rear have to be so bright ? (I put black tape over it)
All and all very pleased .


super me encanto

So far so good!

2 T/5i with Maggy MMGs driven by 2 Outlaw Audio M2200 200watt monoblocks. Still tuning it all in but sounds better every day. Couldn't be happier!

Tres Hombres and Sign o' the Times

I test drove my T/5i with ZZ Top's Tres Hombres and Prince's Sign o' the Times that was all I needed to hear to justify the purchase of this sub. It was like listening to a whole new album.

I've got two small kids and a dog, so I'm forced to have bookshelf speakers up high, away from danger. I love my Klipsch RP-600ms, but they are obviously limited. Not any more. Setup and break in was easy. I was worried that my hardwood floors would somehow distort the bass with the downfiring driver. Not so.

I was on the fence for a while, hemming and hawing about the $600 price tag. I'm glad I finally bought this. I can't wait to hear what other albums really pop.


Suggested Retail: $599

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.



Closed Box, down-firing driver

Active Driver Size & Material

8 in., 200mm long-throw, FibreAlloy™ inverted aluminium dust cap, steel chassis, white cone

Passive Radiator Size & Material


Low Frequency Extention

-6dB at 32 Hz

Input Connectors

High Level Neutrik Speakon, Low Level single RCA, LFE RCA

Output Connectors


Power Output

125 watts (RMS)

Amplifier Type

Class A/B

Wireless Capability

Arrow (Optional), Zero Compression, Single Large Scale Integrated Chip

Protection System

Fully Electronic Set Safe


D.C. Fault


Output Short


Mains Input Voltage

220-240 volts, 110-120 volts for certain markets


1.6 Amp semi delay 230 volts operation, 3.15 Amp semi delay 115 volts operation


W x H x D

10.5 x 12.5 x 12.7 in. (267 x 317 x 322 mm)

Net Weight

26.5 lbs. (12 kg)


High Gloss Black, High Gloss White, 5 coats

Supplied Accessories

Mains Lead


Neutrik Speakon

Yes (10 Meters Nominal)


Users Manual


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