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Definitive Technology SuperCube I

Powered subwoofer

3 Reviews

Item # 735SCUBE1

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Our take on the Definitive Technology SuperCube I

The SuperCube I contains a 10" woofer pressure-coupled to two 10" radiators, for a total output around that of a traditional 18" woofer. This driver array gives the SuperCube I the advantage of far greater speed, musicality, and control than any large single-woofer sub could produce. The woofer is encased in an incredibly rigid basket engineered to hold the massive magnet structure and large voice coil in absolute alignment. The non-resonant cabinet is nearly 2" thick and uses multiple internal bracings to make sure that you hear clean bass without sound-muddying vibrations.

Huge bass from a compact subwoofer

Definitive's SuperCube® I subwoofer easily fills any home theater room with exciting bass that'll make your spine tingle on your next movie night. The secret to its success is an active woofer/passive radiator combination that produces big sound despite the cabinet's small size. And a powerful built-in 1,500-watt amplifier really shows off this little sub's tight, accurate bass response.

Size comparison

A unique approach to rock-solid bass

Grille off

The SuperCube I contains a 10" woofer pressure-coupled to two 10" radiators, for a total output around that of a traditional 18" woofer. This driver array gives the SuperCube I the advantage of far greater speed, musicality, and control than any large single-woofer sub could produce. The woofer is encased in an incredibly rigid basket engineered to hold the massive magnet structure and large voice coil in absolute alignment. The non-resonant cabinet is nearly 2" thick and uses multiple internal bracings to make sure that you hear clean bass without sound-muddying vibrations.

Flexible inputs and outputs and advanced controls

Line-level and speaker-level inputs let you connect this sub to just about any audio system. The continuously variable low-pass crossover allows you to precisely control the frequencies that your subwoofer handles. And the built-in high-pass crossover is a nice touch: it prevents your main speakers from overloading with low frequencies if you hook them up through the subwoofer's speaker-level outputs.

Product Highlights:

  • bass-reflex (passive radiator) enclosure
  • 10" long-throw woofer pressure-coupled to two 10" low bass radiators
  • built-in 1,500-watt amplifier
  • frequency response 13-200 Hz
  • continuously variable low-pass 40-150 Hz crossover
  • auto on/off
  • phase control dial for fine-tuning bass performance
  • speaker-level inputs and outputs
  • 80 Hz fixed high-pass crossover for speaker-level outputs
  • line-level inputs and outputs
  • continuously variable high-pass 40-150 Hz crossover for line-level outputs
  • LFE input for use with home theater receiver's subwoofer output
  • piano-gloss black finish
  • 14-5/16"W x 14-3/4"H x 15-7/16"D
  • warranty: 5 years woofer, 3 years amplifier
  • Our 60-day money-back guarantee

What's in the Box:

  • 10" Powered subwoofer
  • 4 Threaded rubber-feet
  • 4 Spike feet (hex-nut attached)
  • Owner's Manual
  • Online Product Registration card

Definitive Technology SuperCube I Reviews

Average Customer Review(s):

(3 Reviews)

Great subwoofer for cinema or music.

yogurtforthesoul from Salt Lake City, Utah on 5/4/2012

This is a very quick review and is really a review by someone that just knows the bare minimum about sub-woofers. First and foremost, this is a very powerful device. It will not let you down, but it also shouldn't at it's price. But, what you pay for will be worth every cent. Just connecting it to the LFE In for regular audio listening is an amazing experience and if you take the time to connect it up to the more "advanced" configurations and learn how to maximize your listening experience, you simply will not be let down by this product. It has great fidelity at both low and high ranges; comparing high pitched hits like a gunshot or a cymbal to that of my old sub-woofer were night and day performances. All the "hits" whether they be heavy low cannon shots or higher pitched cymbals being smashed, sound tight and unequivocally near realistic. It is truly a wonderful reproduction of sound. Now, at first I only used the LFE In connection and I must tell you that even just with that, it was a dramatic difference from any sub-woofer I've used or demoed. When I decided to reconfigure and at the least use the high level (in and out) on my full-range speakers, it was MORE than worth it (assuming you can do a little homework and find the right phase transition and other settings for your listening position, it helps you get the maximum sound from your new device by doing so--so make sure you do your homework). Using all of it's abilities I imagine creates a surreal experience.

Pros: Tight low and high bass. Loud bass with room to spare when its LOUD. No easy to hear artifact-ing. High and Low Pass Crossover Filters for your connections to the sub-woofer: receiver/amplifier/pre-amp in (R/L) and speaker out (R/L) setups using the high and low level connections for your full-range speakers; with this is also a 180 degree phase alignment to further refine and enhance your listening experience. This just might be the last sub-woofer you buy! An amazing piece of hardware.

Cons: Money. If you are serious about buying a truly wonderful sub-woofer for your theater/music setup the cost won't matter then. Can actually be "too" loud; you may have to find a happy medium depending on your living setup. To truly get the most out of this product you really do need to own great equipment: receiver/amplifier, full-range front R/L (these first two though are very important), good speakers, DVD/Blu-Ray, HDTV, etc... It will be a useless buy if your other equipment is sub-par.

Great Value!

Gary from Roseau, Mn. on 1/8/2010

Crutchfield Customer Review (What's this?)

I've run a powered sub for 15 years. My Velodyne VA10-12 finally died. I was kinda skeptical buying a different brand after running velodyne, but after looking at the specs I figured I would give it a shot. I have a Yamaha RV-X1900 reciever, Klipsch RF-83 fronts and Bose center and surround. The sub matches the tight punch of the RF-83's perfectly. I was really impressed at the sound at low levels of listening, superb! The high level listening is flawless as well. I would recommend this to anyone.



Can you say SPL?

Eddie from Daytona Beach on 12/23/2009

Crutchfield Customer Review (What's this?)

Been using this for a month now, with a Onkyo TX-SR876 receiver, a pair of 10 (15?) year old Polk RT2000P's, and matching Polk center, and surrounds. Main use is for music. Linkin Park, Staind, 3 Doors Down, Nickelback, all in mp3 format, through a Denon DVD-1800BD Blu-Ray player is WOW! It's all a new sound. Movies anyone? Blu-Ray through the Denon is something else. I've been using the RT2000P's built-in 200 watt subs forever, and while they have always sounded great, the SuperCube I makes it seem like they were never there. Music, movies, whatever you toss at it, this sub handles it with ease. Very tight. I would highly recommend this sub to anyone looking in this price range. : EP




Hands-on research

Features and Specs

Enclosure Passive Radiator
Video Shielded No
Woofer Size (inches) 10
Woofer Composition
Firing Direction Front
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs Yes
Speaker-Level Outputs Yes
Low-Pass Crossover Freq 40-150 Hz
High-Pass Crossover Freq 40-150 Hz
Phase Switch Yes
Amplifier Output (watts) 1500
Frequency Response 13-200 Hz
Height (inches) 14-3/4
Width (inches) 14-5/16
Depth (inches) 15-7/16
Weight 70 lbs
Speaker Parts Warranty 5 Years
Speaker Labor Warranty 5 Years
Amplifier Parts Warranty 3 Years
Amplifier Labor Warranty 3 Years

Product Research

Overview: The Definitive Technology SuperCube I is a compact, high-quality powered subwoofer intended for use in a music or home theater system. The SuperCube I powered subwoofer allows for easy, seamless integration into almost any two-channel or multichannel speaker system; delivering true, accurate, and extremely deep bass in any room. The SuperCube I is finished in a piano-gloss black lacquer finish with a black non-removable cloth grille.



Passive Radiator Design: The SuperCube I features a 1500-watt (RMS) class D amplifier driving a 10-inch SuperCube Technology woofer, pressure coupled to two side-firing 10-inch Ultra Low Bass Radiators. The total piston area of this design is 235 square inches; equivalent to an 18-inch diameter woofer, but with far greater speed, musicality, and control than a single large diameter woofer can deliver.

PowerField Technology Amplifier: The SuperCube I incorporates Definitive's proprietary PowerField technology, by which the amplifier is specifically engineered in conjunction with the driver for optimum load matching and power transfer characteristics. The SuperCube I is powered by a 1500-watt (RMS) class D amplifier. The result is high-definition bass performance extending effortlessly down to 13 Hz.

High-Definition Subwoofer: The powerful, high-definition 8" long-throw subwoofer driver is specifically engineered by Definitive Technology to deliver rock-solid low distortion bass, reaching down to the lowest subsonic frequencies (14-200Hz), with superior transient response. The special ultra-stiff, low-mass cone (for super-fast transient response) is joined to a specially formulated surround and long-throw voice coil and spider. The ultra-rigid basket is engineered to hold the woofer's massive magnet structure and large voice coil in absolute alignment. The high temperature voice coil is made of aluminum wound with triple insulated ultra-pure copper wire and baked in epoxy for increased power handling.

Non-Resonant Cabinet: The cabinet of a loudspeaker plays a large part in its sonic performance. Resonance and vibration can add unwanted distortion as well as drain away important energy from the system. The Definitive Technology SuperCube I powered subwoofer utilizes a monocoque cabinet, which has been specifically engineered to be totally inert and vibration free, to ensure you of pure sonic reproduction. Monocoque means that the cabinet is of a unitized construction where all panels are permanently joined together into one solid structure. The cabinet walls themselves are high-density medite fused together by space-age polymer adhesives. The front and rear panels nearly 2-inches thick and the cabinet, itself, incorporates multiple internal braces to ensure total solidity.

Protection Circuits: The Definitive Technology SuperCube I features two protection circuits that ensure that the subwoofer can never be overdriven.

Interchangeable Feet: The SuperCube I comes with 4 rubber feet and 4 spiked feet for safe and secure placement of the powered subwoofer on your carpet or hardwood floors.

Placement: The Definitive Technology powered subwoofer has been designed to operate at frequencies generally below 150 Hz. Because low-frequency information in this range essentially is non-directional, your subwoofer can be located anywhere in your listening room that is most convenient. Also the continuously variable low-pass filter operate at a very fast roll-off, ensuring great performance wherever you place the subwoofer. There are, however, some general rules that you should bear in mind when locating the powered sub.

  • For maximum output the subwoofer should be placed in a corner or against the wall; leaving roughly 2- to 4-inches of clearance between the subwoofer and the wall(s).
  • Corner placement will increase the subwoofer's efficiency, which in turn will increase your system's maximum output and improve the dynamic capability of the subwoofer.


Subwoofer Controls: A complete array of controls allow the SuperCube I to be perfectly integrated with any stereo or multi-channel audio system, and tuned for optimum performance in any room.

Volume Control: The SuperCube I features a rear-mounted volume control. This control is used to raise or lower the output level of the subwoofer in relation to the other speaker in your system.

Variable Low-Pass Crossover: The Definitive Technology powered subwoofer features a continuous variable low-pass filter control on the back-panel. This filter is continuously variable between 40 and 150 Hz. It "rolls-off" (24dB/oct) the high-frequency response of your subwoofer so only low-frequencies below the desired setting will be heard. This low-pass filter control is used to obtain the optimum transition between the subwoofer and your main speakers.

Variable High-Pass Crossover: The SuperCube I is equipped with a continuously variable high-pass filter (40-150Hz, 12dB/oct) which is used when you wire the low-level inputs of the subwoofer to a full-range signal and the low-level outputs of the subwoofer to the left and right channel inputs of your amplifier. When hooked up this way, it allows you to vary the low-frequency roll-off of your main speakers. This control only works using the low-level inputs and outputs.

Variable Phase Alignment: The powered subwoofer features a rear-panel variable phase control dial with a range of 0-180 degrees. This control is used to perfectly blend the output of your subwoofer with your main speakers to compensate for any possible problems due to placement constraints.

Auto Turn-On Circuit: The powered subwoofer has a special power circuit which automatically turns the powered subwoofer on when a signal is fed to the loudspeaker and turns it off when there is no signal present, so it does not require an on-off switch.

LED Indicator: The red LED on the back panel of the powered subwoofer will light up when a signal is sensed and the amplifier turns on. It will automatically turn off with the powered subwoofer, a little while after the signal is discontinued.


Line-Level & Speaker-Level Connections: The Definitive Technology SuperCube I powered subwoofer has a complete range of inputs and outputs to allow easy and effective hookup to any system. Both (high) speaker level and low-level inputs are provided in case you do not have a subwoofer output. In addition, the SuperCube I has a separate direct-in LFE low-level input (which bypasses the crossover network).

LFE Input: The LFE input on the SuperCube I is a mono-RCA input which is not affected by the subwoofer's low-pass filter or low-pass crossover control. It is designed to connect the SuperCube I to a receiver which features a dedicated subwoofer output which features its own low-pass crossover filter.

Low-Level Inputs: If your receiver does not feature a dedicated subwoofer output, but does feature stereo RCA outputs, you can use the SuperCube I's stereo RCA low-level inputs (which provide its own dedicated variable low-pass crossover circuit) to connect the subwoofer to your receiver,

Speaker Level In: The Speaker Level inputs (binding posts) are designed to be used on receivers or amplifiers that do not incorporate any RCA type subwoofer outputs. If your receiver is equipped with an RCA type subwoofer outputs, these speaker level inputs should not be utilized.

Low Level Output: The SuperCube I features a pair of low level outputs for connecting the powered subwoofer and your main speakers in a Pre-Amplifier/Power Amplifier configuration.

Speaker Level Output: The SuperCube I also features speaker level outputs (binding posts), so you can connect your front (main speakers) through the powered subwoofer. The SuperCube I has a built-in speaker level high-pass crossover preset at 80 Hz (6dB/oct).

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.