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The Definitive Technology SuperCube III is an ultra-compact powered subwoofer featuring a 7.5-inch SuperCube Technology woofer pressure coupled to two side-firing 7.5-inch Ultra Low Bass Radiators, providing bass performance equivalent to a 12-inch woofer but with greater speed and control. It is powered by a 650-watt RMS class D amplifier utilizing Definitive's proprietary PowerField technology for optimum load matching and power transfer, delivering high-definition bass down to 16 Hz. The subwoofer has a frequency response of 16-200 Hz and includes controls for low-pass crossover frequency (40-150 Hz), high-pass crossover frequency (80 Hz), and a phase switch. It supports preamp-level and speaker-level inputs and outputs but does not have wireless capability or room correction features. The enclosure is a passive radiator design finished in piano-gloss black lacquer with a non-removable black cloth grille. Dimensions are approximately 10-13/16 inches high, 10-3/16 inches wide, and 11-5/16 inches deep, weighing 25 lbs. Warranty coverage includes 5 years for speaker parts and labor, and 3 years for amplifier parts and labor.
Driver and acoustic performance characteristics
Amplification power output and characteristics
Driver configuration and enclosure design
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Estimated price (community-sourced)
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Components that show up alongside the SuperCube III in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The SuperCube's low-frequency extension is 13 Hz against the SuperCube III's 16 Hz, its woofer 10" against 7.5", and its crossover 80 Hz against 40 Hz. Both share high-frequency extension (200 Hz).
Both turn up in the same documented systems.
The SUB3010's high-frequency extension is 150 Hz against the SuperCube III's 200 Hz, its woofer 10" against 7.5", and its low-frequency extension 28 Hz against 16 Hz. Both share ways (1).
The S8's woofer is 8" against the SuperCube III's 7.5", its high-frequency extension 180 Hz against 200 Hz, and its low-frequency extension 27 Hz against 16 Hz. Both share ways (1).
The SUB-80X Down Firing's woofer is 8" against the SuperCube III's 7.5", its high-frequency extension 180 Hz against 200 Hz, and its low-frequency extension 23 Hz against 16 Hz. Both share ways (1).
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