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Definitive Technology SuperCube III Ultra-compact powered subwoofer

Item # 735SCUBE3

The SuperCube III contains a 7-1/2" woofer pressure-coupled to two 7-1/2" passive radiators, for a total output...

The SuperCube III contains a 7-1/2" woofer pressure-coupled to two 7-1/2" passive radiators, for a total output...

Item # 735SCUBE3

Shop all Definitive Technology Powered Subwoofers

About the Definitive Technology SuperCube III

Kristen Schaub

Ultra-compact subwoofer delivers big bass

The SuperCube III contains a 7-1/2" woofer pressure-coupled to two 7-1/2" passive radiators, for a total output around that of a traditional 12" woofer. This driver array gives the SuperCube III 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.

Ultra-compact subwoofer delivers big bass

Definitive's smallest subwoofer, the SuperCube III provides huge bass performance in a compact, room-friendly enclosure that takes up less than a cubic foot of floor-space. 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 650-watt amplifier really shows off this little sub's tight, accurate bass response.

Grille off

A unique approach to rock-solid bass

Connections

A look at the rear panel offering a number of hookup options.

The SuperCube III contains a 7-1/2" woofer pressure-coupled to two 7-1/2" passive radiators, for a total output around that of a traditional 12" woofer. This driver array gives the SuperCube III 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.

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Product highlights:

  • bass-reflex (passive radiator) enclosure
  • 7-1/2" long-throw woofer pressure-coupled to two 7-1/2" low bass radiators
  • built-in 650-watt amplifier
  • frequency response 16-200 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
  • two pairs of line-level input
  • LFE input for use with home theater receiver's subwoofer output
  • piano-gloss black finish
  • 10-3/16"W x 10-13/16"H x 11-5/16"D
  • warranty: 5 years woofer, 3 years amplifier
  • MFR # LDAA

What's in the box:

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

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More details on the Definitive Technology SuperCube III

Stacey B.

Features & specs

Enclosure Passive Radiator
Woofer Size (inches) 7 1/2
Woofer Composition ---
Firing Direction Front
Amplifier Output (watts) 650
Frequency Response 16-200 Hz
Connections
Preamp-Level Inputs Yes
Speaker-Level Inputs Yes
Speaker-Level Outputs Yes
Wireless No
Controls
Low-Pass Crossover Freq 40-150 Hz
High-Pass Crossover Freq 80 Hz
Phase Switch Yes
App Control ---
Remote ---
Other Info
Height (inches) 10-13/16
Width (inches) 10-3/16
Depth (inches) 11-5/16
Weight 25 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 III is a compact, high-quality powered subwoofer intended for use in a music or home theater system. The SuperCube III 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 III is finished in a piano-gloss black lacquer finish with a black non-removable cloth grille.

Features
Controls
Connections

Features

Passive Radiator Design: The SuperCube III features a 650-watt (RMS) class D amplifier driving a 7-1/2 inch SuperCube Technology woofer pressure coupled to two side-firing 7-1/2 inch Ultra Low Bass Radiators. The total piston area is greater than a 12-inch diameter woofer but with far greater speed, musicality, and control than a single large diameter woofer could deliver.

PowerField Technology Amplifier: The SuperCube III 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 III is powered by a 650-watt (RMS) class D amplifier. The result is high-definition bass performance extending effortlessly down to 16 Hz.

High-Definition Subwoofer: The powerful, high-definition 7-1/2 inch long-throw subwoofer driver is specifically engineered by Definitive Technology to deliver rock-solid low distortion bass, reaching down to the lowest subsonic frequencies (16-200Hz), 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 III 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 III features two protection circuits that ensure that the subwoofer can never be overdriven.

Interchangeable Feet: The SuperCube III 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.

Controls

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

Volume Control: The SuperCube III 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 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.

Connections

Line-Level & Speaker-Level Connections: The Definitive Technology SuperCube III 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 III has a separate direct-in LFE low-level input (which bypasses the crossover network).

Low Level Inputs: This input is an RCA type LFE/Stereo input. If you are connecting your subwoofer to an A/V receiver with an LFE or Subwoofer preamp output, connect a single RCA cable to the LFE input. If you are connecting your subwoofer to an AV receiver without a dedicated subwoofer or LFE preamp output, but does features a stereo RCA output, use a stereo RCA cable for connection.

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.

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

  • 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.

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