• Tzero MKIII Subwoofer
      • Tzero MKIII Subwoofer
      • Tzero MKIII Subwoofer
      • Tzero MKIII Subwoofer
      • Tzero MKIII Subwoofer
      • Tzero MKIII Subwoofer

      REL Acoustics

      REL Acoustics Tzero MKIII Subwoofer



        In stock (1) - 2-3 days Available in store: Check availability

        The Tzero MKIII enriches even modest systems with power & natural bass, bringing the quality & full REL connectivity suite, long throw drivers & powerful, reliable amplifiers to a new lower price point & dimension. Free shipping to Continental US only!

        Product description

        Tzero MKIII is every bit a true REL, just smaller.  It enriches even modest systems with power and natural bass by bringing the quality and full REL connectivity suite along with an all-new aluminum cone that provides much greater stiffness to the driver for punch and a powerful, reliable Class D amplifier, all at an attractive price point and size. Ideal for apartments, flats, studies, anywhere space is limited.

        Miracle In Miniature 100% REL, Just Smaller

        Tzero is, in many ways, the most difficult design we have ever executed because never before have we delivered so much for so little. Five coats of your choice of black or white high gloss lacquer as in all Serie T, NextGen Class D amplifiers, our famous High Level Input, plus a separate .1/LFE input stage with its own volume control to get theatre levels AND music perfect without racing to adjust or looking for a remote control.
        The jewel of the MKIII is the new aluminum-coned driver, a rugged 6.5” unit with exceptional output and low bass extension for its size. While it won’t drive medium or large rooms hard, we make plenty of larger models that handle that task, Tzero MKIII remains a miracle in miniature

        Shockingly, the T-Zero moves enough air to pressurize a small room down into the low 30s, with a growl that makes it sound like it plays much deeper. The T-Zero blends gorgeously with most speakers but has a natural affinity for tiny monitor speakers, giving them the presence and "flesh on the bones" they so desperately crave. The custom designed Class D amp gives the T-Zero sledgehammer slam and surprising dynamic shading; make no mistake, the T-Zero does not defy physics, it is the very essence of a high-quality compact sub-bass system, purpose built for those with necessarily small listening spaces and uncompromising tastes.

        T-Zero Design

        The T-Zero borrows liberally from the design elements of the R-Series and the engineering of the T-series. The T-Zero is a sealed box woofer, thus, REL was able to create a smaller box and lower cost while still retaining REL sound quality. Like other T-Series woofers, the T-Zero uses a custom-made woofer, a REL designed 6.5" Ultra-Long Throw, mated to a wicked fast Class D amplifier delivering a potent and ultra-green 100 watts. The crossover is identical to its larger brothers and offers the same broad and stepped controls for ideal loudspeaker matching.

        REL-D ( for Digital Amplifiers )

        In the past, if someone wanted to connect a REL sub-bass system to a digital amplifier, a special cable with a circuit built-in was required so the REL wouldn't damage that amp. Now that digital amplifiers can be found virtually everywhere, REL has installed a special circuit in the T-Zero called REL-D, which makes any special precautions unnecessary.


        REL takes great pride in building powerful, reliable and musical Sub-Bass systems. A critical element of every REL Sub-Bass unit is the amplifier. The T-Series employs wideband, high-current Class A/B amplifiers, with large high-quality power supplies and excellent overload protection. These amplifiers are purpose built for driving REL Bass Engines and give the T-Series virtually unlimited power to play louder, deeper and cleaner with extremely low distortion.

        On a "Green" Note

        T-Series amplifiers have a unique power saving feature called “power starvation”. Whenever there’s no signal present, the amplifier goes instantly to maximum power saving efficiency, consuming a mere 4 watt of power ( less than an LCD TV in standby ), yet the amplifier remains at maximum readiness to immediately respond to a sudden transient signal, even after a long quiet period and regardless of level. This innovative feature eliminates the need to switch off a T-Series woofer when not in use.


        The crossover in the REL T-Series is a 12 dB / Octave hand-built crossover manufactured by highly skilled Welsh technicians. The precision and testing that goes into the T-Series crossovers are consistent with the highest manufacturing practices to ensure long life, reliability and consistent performance. This does not mean added complexity! To adjust the crossover point upwards, simply rotate the crossover knob clockwise, to lower the crossover point downwards, rotate counter-clockwise. In adjusting the crossover, please notice that REL has chosen to use a "stepped" switch instead of the more conventional smooth rotating crossover adjustment. This allows the user to precisely define the exact crossover point with confidence and the ability to achieve 100% repeatable results. This also makes integrating a REL extremely easy, simply move the crossover point one click at a time until a proper blend has been achieved. Want to double check the results? Simply adjust the crossover by one click up or down; does the REL sound better? If not, simply reverse the change and the REL is exactly where it needs to be. This precision and attention to detail are hallmarks of REL products and engineering. There’s a great tip for setting the crossover point for T-Series woofers in the owner’s manual:

        "There may be a tendency to set the crossover point too high and the volume of the Sub-Bass System too low when first learning how to integrate a REL with the system, the fear being one of overwhelming the main speakers with bass. But in doing so, the resulting set-up will be lacking in bass depth and dynamics. The proper crossover point and volume setting will increase overall dynamics, allow for extended bass frequencies, and improve soundstage properties. Note: volume must be adjusted in conjunction with crossover changes. In general, when selecting a lower crossover point, more volume may need to be applied."


        REL has a different approach to low frequency reproduction and also a different perspective on how to achieve this goal. All REL Sub-Bass systems offer two types of connection, a unique High-Level ( Speaker Level ) connection and a .1/LFE connection ( RCA ), each with their own volume controls. The T-Series has an additional input, a Low level input ( RCA ).

        The High-Level connection is highly preferred as it connects the REL directly to the system’s amplifier, allowing the REL, chameleon-like, to take on the sonic character of the entire system. The very high input impedance (100kΩ) of the High-Level connection ensures that the system’s amplifier doesn’t even see (electrically speaking) the REL, yet this connection enables the REL to very accurately reproduce both the timbre and timing of the system.

        The .1/LFE RCA connection is a separate connection designed to be used in tandem with the High-Level connection to provide unparalleled flexibility in a home theater environment. The High-Level connection provides low-frequency reinforcement to the main speakers while the .1/LFE connection provides reproduction of the exclamation point bass the LFE channel is intended for. Simply connect an RCA cable from the LFE output on the surround processor to the .1/LFE input on the REL. This input has its own volume control, but all crossover adjustments for this input are done at the surround processor.

        If for some reason the High-Level connection cannot be used, ( e.g. a system with powered speakers) then the Low-Level input should be used, allowing the T-Series to be connected via an RCA cable. This is a mono input, so if stereo output is available from the preamp or processor, a y-adaptor should be used to combine the signals. The Low-Level input shares the crossover and volume control of the High-Level input. The Low-Level input is not the preferred connection, only use if High-Level connection is simply not possible.

        Good, Better, Best

        The Good, Better, Best philosophy too often leads to compromised products or a “one-model fits all” mentality. REL does not adhere to this flawed marketing scheme. There are no compromises in REL models and in our opinion every single REL woofer is worth owning. However, like all high quality tools, every REL is engineered for a specific purpose, which makes it easier to pick the right tool for the job; some models work better in small rooms, some models work better with large speakers, some integrate better with small speakers, some models even work better with planar speakers! With REL, there are no bad choices and hopefully the description above has helped guide your choice, but if you have questions that aren’t answered here or if you’d like a recommendation for the best fit for your system, please don’t hesitate to call us and ask for a REL specialist.


        Type: Sealed, down-firing active woofer
        Drive Unit: 6.5in. long-throw, steel chassis
        Lower Frequency Response: 38 Hz at -6 dB in room
        Input Connectors: High-Level Neutrik Speakon, Low-Level single phono, LFE phono
        Input Impedance: High-Level: 150k, Low Level: 10k, .1/LFE: 10k ohms
        Gain Control Range: 80 dB
        Power Output: 100 Watts ( RMS )
        Phase Switch: Yes, 0 or 180 degrees
        Amplifier Type: Class D

        Protection System:

        Fully Electronic with SET-SAFE: Yes
        D.C. Fault: Yes
        Output Short: Yes
        Fuses: 2.00 Amp semi delay

        Dimensions ( W x H x D ): 8.5" x 9.5" x 10.25"
        Net Weight: 15 lbs.
        Finish: Gloss Piano Black or White Lacquer

        Shipping weight & dimensions: 18.8 pounds, 11.5" x 11.5" x 14"

        Available in store


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