Founded in 1924 by Cyril French and his brothers in Hampton Wick, London, Celestion is a British loudspeaker manufacturer headquartered in Ipswich, England. The company's early work producing radio and gramophone speakers laid the foundation for what would become one of the most influential names in guitar amplification. Celestion's trajectory changed when Vox selected a modified Celestion G12 radio speaker for its AC15 and AC30 amplifiers, establishing the brand as the backbone of amplified guitar tone. The iconic Alnico Blue — painted azure at the request of Vox founder Tom Jennings — became synonymous with the AC30 and was embraced by guitarists including Brian May and George Harrison.

Celestion's guitar speaker lineup reads like a catalog of industry standards. The Greenback (G12M), with its distinctive green magnet cover, became the defining voice of early Marshall stacks, favored by Eric Clapton, Jimi Hendrix, Angus Young, and Eddie Van Halen. The Vintage 30, introduced in 1986, is one of the most widely used guitar speakers in rock and metal, with players like Slash, Peter Frampton, and Steve Vai among its advocates. The Creamback series bridges the classic Greenback warmth with higher power handling for modern applications, while the G12H variant delivers a tighter, more aggressive low-end response. Beyond guitar speakers, Celestion manufactures professional audio loudspeakers and compression drivers used in sound reinforcement, and offers digital impulse responses through its Celestion Plus platform. Their speakers are standard equipment in amplifiers from Marshall, Vox, Fender, and Orange.

Celestion has 57 products cataloged on Equipboard, including Guitar Amp Speakers, Guitar Amplifier Cabinets, and Speakers & Accessories. Their gear is featured by 148 artists, with the strongest followings in Rock, Metal, and Folk, World, & Country. Notable users include Takayoshi Ohmura, Steve Rothery, and Glenn Fricker. Celestion's catalog spans the full price spectrum — from entry-level options to high-end flagships.