Serie T/i


We have a longstanding tradition of requiring the top model in any range to be more. More than the sum of its parts, it represents the grandest scale, the highest output and the most we can do within any given technology envelope.

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The Most T/i Available

The Series Flagship

T/9i represents the most of T/i that we can deliver, and if sheer output alone is a primary requirement for your theater or music system then read no further. The combination of a lightweight, composite 10” driver coupled to a matching 10” T/i passive delivers speed, slam and attack when called upon but also is capable of tracing more delicate passages when necessary. Large in sonic scale, the T/9i is ideal for mating up with floor standing speakers and rooms that are on the medium-to-large size. Powerful, concussive, yet beautiful.


Reimagined, Then Reengineered

A completely redesigned flagship

T/9i delivers more than just raw output. We started with our driver upgrades and built outward. The lovely cabinets grew by 4 lbs. (1.8 kg) 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.


Outsized Performance

Innovative Alloy/Fibre Bass Engines

The new composite alloy/fibre engine in T/9i blends precisely the correct dimension of stiffening alloy with a fibre material chosen for its sonic neutrality and light weight. The combination is brilliant; exceeding the performance of competitors’ drivers that are many times more expensive. The forward-firing 10” active couples with a 10” down-firing passive, again with carefully chosen balances of alloy to fibre and the result is seamless, effortlessly deep bass that blends perfectly with the main speakers.


Great Subs, Great Amps

The Brains Behind the Brawn

Our acclaimed input filters and robust amplifiers result in some of the best sounding, most reliable designs ever produced. High current power supplies, huge toroidal transformers, and what many critics call the best filters in the world produce the famous REL Effect—where in not simply the bass region but ALL music and movie sound is uplifted and improved.

Standby Mode switch not included on 110V units.


Zero Compression Wireless

Introducing Arrow™

Following on the heels of the acclaimed LongBow™ Wireless, Arrow delivers much of the promise and connectivity of hardwired RELs with the placement flexibility and pure cool factor of great wireless for all of T/i. For a reasonable sum, Arrow gives you the ability to place subs in distant corners, along glass walls, or on hardwood floors where a cable would otherwise destroy the effect.

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Customer Reviews

Based on 45 reviews
My review

I recently bought a rel t9i , I have a pair of old kef 107 speakers i bought them new in 1987, they came with a base extension kube, two years ago the kube quit working, kef no longer produced the kube. The base was dramatically reduced, after many adjustments woke up my old kef 107s the base is deep and very controlled and tight the whole sound stage is dramatically improved my old kef speakers sound better than new.

Beautiful blend

Bass is rich, full, and immersive. Sub can turn on a dime, disappearing instantly if needed. Incredibly musical. So articulate, so punctuative. A gem.

I truly did not realize what I was missing!

I've had an Anthem integrated 225 paired with Paradigm Monitor 11's in my TV/music room for the last 4 years now and didn't ever really think about a subwoofer. Then recently some different audiophile videos started popping up in my YouTube feed, including a lot of folks talking about REL. This led me further down the rabbit hole and watching a lot of REL's videos and philosophy behind what a subwoofer can and should do for your system. The T/9i seemed the best pick for my room size and budget, and I can't imaging being happier with it's performance. Set up is a breeze. I feel like I'm listening to my music library for the first time--I tell 'ya I have some HD audio Metallica concert recordings and it feels like a live show in my living room. TV/movie soundtracks also sound amazing. Thank you REL for such an amazing product!

You will be amazed at what you have missed

I have a T7i partnering my TV but purchased a T9i for my ageing but still excellent music system. The Kef 105/3 speakers I have had new since 1992 along with Audiolab monoblocks are still giving anything a run for their money at any price. But on the way down to 45 Hz and tailing off at way above that the addition of the T9i supplements and then adds and then adds some more. The easy set up adjustments on the T9i ensure a nuance to be added or for the right music, party time! I sat it on a solid 40 mm thick piece of granite, it looks good, compliments my system very well indeed and has allowed me to fall in love with my system all over again. The only downside is that I have missed so much of my music over 27 years! This product really has finished it off.


Amazing subwoofer
Have paired with an Ambeo sound bar and a 65 inch Sony A9G

Coming from a 10 year old Bose Acoustimass with about 560 watt Onkyo Amp this system totally blew it away!

So natural sounding. Feels like you are in concert hall or live theater with the performers right in front of you.

Incredible range on the system. Never knew a good sub could make such a difference

Reviews + Awards
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Suggested Retail: $1,299

We have a longstanding tradition of requiring the top model in any range to be more. More than the sum of its parts, it represents the grandest scale, the highest output and the most we can do within any given technology envelope.



Front-firing active driver, down-firing passive

Active Driver Size & Material

10 in., 250mm long-throw, FibreAlloy™ inverted aluminium dust cap, steel chassis, white cone

Passive Radiator Size & Material

10 in., 250mm long-throw, inverted aluminium dust cap, steel chassis, black cone

Low Frequency Extention

-6dB at 28 Hz

Input Connectors

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

Output Connectors


Power Output

300 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


3.15 Amp semi delay 230 volts operation, 6.3 Amp semi delay 115 volts operation


W x H x D

13 x 15.2 x 16 in. (330 x 387 x 407 mm)

Net Weight

41.3 lbs. (18.7 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.