$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.

Find a Dealer

REL Customer Promise Learn More

SKU: N/A Categories: , ,

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 26 reviews
Magneplanar LRS, REL T/5i combo

Very pleased with my Magneplanar LRS, double T/5i combo. Driving the setup with PS Audio Stellar Gain Cell/ M700 monoblocks.

The woofs match very well with the Maggies and setup was easy following the REL instructions. I have dialed down both the x-over point and level settings on the woofers since the initial setup, but still within the +/- 3 clicks mentioned in the setup instructions. Great imaging, snap, width and depth. Bass extension better than I expected from such small woofer drivers. Mate beautifully with the quickness of the Maggies and really go deep in my room.

I didn’t need to use an RCA cable as a ground in my setup when I floated the woofer ground wires. Only nit I would pick is that I wish there was a standby mode when there was no signal being fed to the woofers.

Great synergy!

The T/5i paired perfectly with my system (Leben cs600, Harbeth 3pesr). Could not be more pleased. Also, fast shipping and great customer support!

Love my T5

... sub bass system. Works fantastic with my Marantz 5006 and Dali Ikon Mk2's.
Have.had it for a couple of years now, depth, oomph, warmth and easily, if not a lot of tinkering, installed and set up.
Love it...!

Great little sub

I love the tiny footprint and the amazing sonic punch this beautiful sub packs. I have it connected with LFE from my pre/pro and high level straight to my amp. Music and movies are phenomenal. My B&W LCR has renewed life! There are however, two things I find disappointing: 1) there is an annoying light on the back that is always on when sub is powered up. I covered it with electrical tape 2) no standby switch. For a sub of this quality and price I would have expected better from REL. I very much look forward to adding another little monster and getting a couple t9i’s for my big thester room!

A perfect sub

REL was recommended by my speaker manufacturer, even though they have a sub of their own. It mates perfectly with my speakers, REL was very considerate about information and installation, and follow up/installation was well supported.


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.



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.