True II

About the True II

The Sunfire True Subwoofer Mk II is a compact, high-output powered subwoofer designed by Bob Carver, built around an approximately 11" x 11" x 11" sealed cube cabinet and a 2,700-watt Tracking Downconverter amplifier. Unlike the original True Subwoofer, the Mk II uses dual opposing long-throw diaphragms (one active driver and one passive radiator) with an effective cone diameter of about 8-10 inches, arranged in a push-pull configuration to move a very large volume of air while keeping cabinet vibration extremely low. The system is rated to deliver greater than 110 dB SPL at very low frequencies and extends down to about 18 Hz in-room, with a manufacturer-spec'ed response of roughly 18 Hz to 75-80 Hz (±3 dB) depending on source, and practical usability up toward 100 Hz. Controls include continuously variable volume, phase adjustment from 0° to 180°, and a variable low-pass crossover; published ranges vary slightly by documentation, but typical Mk II settings sit roughly in the 35-40 Hz to 75-80 Hz region, with Sunfire's steep 36 dB/octave slope near the upper crossover range and shallower slopes at lower crossover frequencies. The subwoofer provides both line-level RCA inputs and speaker-level binding-post inputs, plus line-level high-pass outputs around 70 Hz, 6 dB/octave, for feeding satellite speakers. Input coupling is described by Sunfire and reviewers as optical, referring to the internal isolation scheme used for both standard line-level and high-level connections. The cabinet weighs around 48 lbs, carries a black lacquer/anodized finish, and typically omits traditional fabric grilles in favor of exposed flat diaphragms. The Mk II revision focuses on improved driver design and power handling, preserving the same 2,700-watt amplifier topology while reducing cabinet motion and enhancing reliability under high-level use. Soft-clipping and other protection circuits allow the subwoofer to overload gracefully, making it well-suited for demanding audiophile and home-theater applications where very high output from a small enclosure is required.