Quad Eight Electronics is a Southern California audio manufacturer that built large-format recording and post-production consoles, microphone preamps, equalizers, and outboard gear from 1962 through the late 1980s. Founded as Quad-Eight Sound (QES) by Bud Bennett to build film dubbing and editorial systems for Hollywood studios, the company grew into a console maker whose discrete, transformer-balanced circuitry became a fixture at major film lots and music studios including 20th Century Fox, Universal, Decca, Warner Bros., Motown, and Stax, as well as live venues such as the Hollywood Bowl and the Grand Ole Opry. Early Quad-Eight desks were assembled around Electrodyne modules — the same designs credited with combining mic preamp, line amp, EQ, and routing into a single channel strip — before the company brought manufacturing fully in-house.

The Quad Eight sound is associated with classic consoles like the 2082 (the desk used on The Last Waltz) and the Ventura and Pacifica series, along with channel modules and standalone units such as the MM-310 mic preamp and the CA 227 preamp. Pink Floyd's The Wall was famously mixed on three Quad Eight consoles wired together, and the brand earned a reputation among engineers as a 'secret weapon' that held its own against Neve and API for warmth, midrange punch, and depth. After Mitsubishi acquired and eventually shuttered the original company in the late 1980s, Quad Eight Electronics LLC was revived to produce limited-edition, hand-built recreations of the classic designs — including the 310 Classic, 444 Classic, and MM61 modular rack — alongside repair and restoration services for vintage units. A-Designs Audio also produces the Pacifica and 500-series P-1 preamps under license from the brand's lineage.

Quad Eight has 7 products cataloged on Equipboard, including Mixers, Effects Processors, and Preamps. Their gear is featured by 8 artists, with the strongest followings in Rock, Pop, and Electronic. Notable users include Manny Marroquin, Kevin Parker, and Aphex Twin.