Definitive Technology is an American loudspeaker manufacturer founded in 1990 in Owings Mills, Maryland by Sandy Gross, Don Givogue, and Ed Blaise. Gross, previously a co-founder of Polk Audio, launched the company with a focus on monolithic bipolar tower speakers — a design that fires drivers from both the front and rear of the cabinet to create a more enveloping soundstage. The brand built its reputation in the U.S. premium home-audio market with tower speakers that integrated powered subwoofers into the cabinet, an unusual approach at the time.

The company's catalog centers on home theater and stereo listening rather than professional studio monitoring. Flagship and well-known product lines include the Dymension bipolar towers (DM40, DM60, DM70, DM80) with built-in powered subwoofers, the earlier BP-9000 bipolar series, the more traditional monopole Demand Series bookshelf and tower speakers, and the compact ProCinema home-theater packages. The lineup also spans center channels, in-wall and in-ceiling speakers, Dolby Atmos height modules, subwoofers, and outdoor speakers.

Definitive Technology operates from Vista, California, and its products are typically sold through custom-installation dealers and specialty AV retailers. The brand is best known in the home-theater enthusiast community for the bipolar radiation pattern and integrated-sub tower concept that has been a through-line across generations of its flagship speakers.

Definitive Technology has 14 products cataloged on Equipboard, including Surround Sound Speakers, Floor-standing Speakers, and Home Subwoofers.