REL T/Zero MKIII Subwoofer [2024 Review]

Sometimes you just haven’t got the room size for a great big subwoofer, with booming power and room-shaking bass. Fortunately, for a smaller room size, REL make a really great option to fit perfectly into your home audio system. We took a look at the best REL Acoustics subwoofers and found the REL T/Zero MKIII Subwoofer to be the ideal pick for any room size that is on a smaller scale.

If you’re still unsure whether this is the best REL subwoofer for you, carry on reading and we’ll go into more detail about each one and help you decide which is the ideal pick for your home audio setup.

Let’s get into it and find out more about the T/Zero MKIII Subwoofer.

REL T/Zero MKIII Subwoofer

REL T/Zero MKIII Subwoofer Review

REL Acoustics T/Zero MKIII Subwoofer

REL T/Zero MKIII Subwoofer White

The REL Acoustics T/Zero MKIII Subwoofer is a small subwoofer, hence one of the cheapest options from the brand. But that doesn’t mean it’s sub-par in terms of sound quality. Powered with a 6.5-inch down-firing driver, this subwoofer has the same build quality REL is known for. 

This is good enough for rooms up to 200 sq. ft. and can even cover up to 400 sq. ft. with a Stereo Pair. So this can be a good choice for small home theaters without costing a fortune. And it comes with various input options, including the High-Level input REL offers in select series subwoofers


DRIVER 6.5-inch, 165 mm long-throw, down-firing
INPUTS High-Level Neutrik Speakon, Low-Level single RCA, LFE RCA
HEIGHT 9.5″ 
WIDTH 8.5″ 
DEPTH 10.5″ 
WEIGHT 15.0 lbs / 6.8 kg
FINISH High Gloss Black

Key Features

  • 6-inch driver, which is the smallest of all REL subwoofers but still packs quite  some power
  • Includes the High-Level Neutrik Speakon (10 m) input cable that ensures strong signal
  • -6 dB @ 37 Hz, similar low-frequency extension as T/x series subwoofers
  • Compact design with lightweight steel chassis

This subwoofer has a small, down-firing driver, which renders it a compact enclosure. However, the small driver still delivers powerful low-frequency responses for small rooms. For rooms larger than 200 sq. ft., you may need a pair of these. You’ll get a deep bass with no distortion. 

Its amplifier is Class D with just 100 Watt power, so it’s not as power-hungry as most of the REL subwoofer models. Also, by using the proprietary High-Level input cable, the subwoofer ensures signal quality isn’t lost when connected to the main system or speaker. 

The user manual has appropriate tuning and placement instructions, allowing for optimized bass output. 


  • Doesn’t take amp from speaker
  • High-quality bass for small spaces
  • Lightweight and easy to move
  • Three-year warranty


  • Not for large spaces