Jon Herron of Wisdom Audio says the company's driver resembles a car's rear-window defogger. Instead of a cone, a Wisdom speaker uses a thin film with flat wire bonded across it, stretched between rows of magnets, so current moves the whole surface at once. Wisdom says the film weighs less than the air around it, and Herron calls the driver easy for an amplifier to drive. A film can be made as long as a designer likes, so many Wisdom speakers are tall line sources. Ken Taraszka of Home Theater Review explains that a line source sends out sound in an expanding cylinder instead of a sphere, which cuts reflections from the floor and ceiling and makes the sweet spot grow. Darryl Wilkinson of Sound & Vision heard "a near-electrostatic, audiophile listening experience" from the Insight in-walls. Wisdom suits listeners who want big-speaker sound from a wall or from behind a cinema screen.

Wisdom sells two main families, and the way they connect separates them. Start with the Insight Series. Each speaker needs just one amplifier channel and runs from a normal AV processor or receiver. The compact P2i is meant to hand the deep bass to a subwoofer, and Brian Kahn of Home Theater Review played Rage Against the Machine on it at levels bordering on uncomfortably loud through a mid-level AV receiver and heard no compression. Wisdom advises running room correction with the baffle switch on Flat, then moving it to Target. The step up is the Sage Series, which runs through Wisdom's own SC-1 controller, needs two amplifier channels per speaker and calls for a dealer install. Taraszka's L75i system took two people a full day to set up. It then played so deep that he checked whether his subwoofer was on, and it was off. Andrew Robinson notes that neither half of the L75m needs Herculean power.

Tom and Debi Bohlender founded Wisdom Audio in 1996 to build planar line sources paired with conventional woofers, and the first Adrenaline speakers followed in 1997. Jeff Fritz reviewed the Adrenaline Dipole 75 for SoundStage! in 1998. Bohlender delivered and set up every system himself, and at Fritz's house the setup took two days, with some tracks repeated tens of times. Fritz said it passed his "Diana Test" for Diana Krall's voice and wrote that "The Adrenaline 75 is staying in my reference system." Wisdom says The Absolute Sound gave the M-75 system a Golden Ear Award in 2000. In 2006 Wisdom began developing in-wall speakers, and in 2007 it began making its own planar drivers for the Sage Series. In 2011 The Absolute Sound credited Wisdom with one of the "highest performance in-wall/on-wall loudspeaker systems currently available," and Taraszka called the L75i "flat-out the best in-wall speakers built to date, at any price." Wisdom builds its speakers in Carson City, Nevada.