Celestion

The speakers that gave rock its voice

History

Celestion was founded in 1924 in Hampton Wick, London by Cyril French and his brothers as the Electrical Manufacturing and Plating Company. In 1925, Cyril and Eric French filed a patent for the "clamped-edge" speaker, giving birth to the Celestion brand name (suggested by another brother, Ralph). The company initially produced speakers for communication equipment, public address systems, and industrial applications—including use in coal mines, aircraft, and lifeboats. Celestion's reputation for building rugged, reliable speakers under challenging conditions was established early. The direction that would define Celestion's legacy began in the 1960s when the company started producing speakers for the emerging electric guitar amplifier market. When Jim Marshall and Ken Bran started making guitar amplifiers in 1962, they found Celestion speakers delivered the sound they were looking for. The partnership between Marshall and Celestion helped create the sound of British rock and roll. The Celestion Blue (introduced in the 1950s, popularized in the 60s) became known as the "Marshall Blue" and delivered the bright, aggressive tone heard on countless classic rock recordings. The Celestion Greenback (G12M) became another icon, delivering the thick, overdriven sound of 1970s rock. In 1992, Celestion became part of Gold Peak Industries (along with KEF), forming Gold Peak Acoustics UK. While the company ceased manufacturing complete speaker systems in 2006, Celestion continues as the world's premier manufacturer of guitar and bass speakers.

Key Facts

Fact	Detail
Founded	1924, Hampton Wick, London
Founders	Cyril French and brothers
Original Name	Electrical Manufacturing and Plating Company
Patent	1925 "clamped-edge" speaker
Key Era	1960s-70s guitar speaker dominance
Current Status	Guitar/bass speaker specialist

Legendary Products

Celestion Blue (G12) "The Marshall Blue"

The original alnico-magnet guitar speaker that defined the British Invasion sound. Its bright, articulate character with aggressive breakup became the voice of 1960s rock. Still manufactured today as the "Heritage" series.

Celestion Greenback G12M (1960s-70s)

The ceramic-magnet speaker that delivered the thick, overdriven sound of 1970s hard rock. The "Greenback" name comes from the green plastic magnet cover. Variants include the 25-watt and 30-watt versions, each with distinct sonic character.

Celestion G12H-30 "Heavy" (1970s)

A higher-powered variant of the Greenback design, delivering more headroom and tighter bass response. Favored for harder rock styles and still widely used today.

Celestion Ditton Series (Hi-Fi)

Before focusing on guitar speakers, Celestion produced respected hi-fi speakers including the Ditton 15, 25, 33, and the legendary Ditton 66—a large studio monitor used by BBC and major recording studios.

Sound Signature

Celestion guitar speakers have a distinctively British voice that is immediately recognizable on thousands of classic recordings. The Blue (alnico magnet) delivers a bright, articulate tone with a complex harmonic breakup that responds beautifully to playing dynamics — dig in harder and the speaker rewards you with rich, musical distortion. The Greenback is darker and thicker, with a prominent midrange that gives overdriven guitar tones their characteristic body and growl.

On the hi-fi side, the Ditton series delivers a presentation that is warm, detailed, and surprisingly refined. The Ditton 66, used as a studio monitor by the BBC, offers a large-scale, authoritative sound with deep bass and smooth treble that belies its age. Celestion's hi-fi speakers share the same fundamental engineering quality as their guitar drivers — precise construction, carefully chosen materials, and a voicing that communicates the energy of live performance.

Collecting Celestion

Vintage Celestion guitar speakers are among the most actively traded items in the audio world. Pre-Rola Greenbacks (manufactured before the 1973 Rola merger) are the holy grail — identifiable by their date codes and cone stampings, these early 25-watt G12M speakers carry a premium that reflects their role in shaping the sound of 1970s rock. Original Blue alnico speakers from the 1960s, particularly those pulled from early Marshall cabinets, are even rarer and more valuable.

The hi-fi Ditton series is genuinely undervalued in the current market. The Ditton 15 and Ditton 25 offer excellent sound at prices far below their performance level, while the Ditton 66 large monitor is a serious speaker that competes with much more expensive vintage alternatives. When evaluating any vintage Celestion, check for original cones — reconed speakers, while perfectly functional, are worth significantly less to collectors than examples with their original paper cones intact.

Competitors & Comparisons

Celestion vs Jensen: Both vintage pioneers; Celestion British, Jensen American Celestion vs Eminence: Modern competitors; Celestion vintage heritage, Eminence value Celestion vs JBL: Different applications; Celestion guitar/PA, JBL broader professional

Models

Amplifiers

DITTON-15XR (1981) — A compact active studio monitor with innovative time-aligned driver design and built-in amplification. Includes detailed specs and production dates.

Speakers

3 (1989) — Celestion Model 3 (1991–1997): a compact floor-standing 2-way speaker, 87 dB efficiency, 8 ohms, 55 Hz–20 kHz response, walnut finish, approx. $1,000 new.
5000 (1975) — A legendary British studio monitor known for its accurate sound and distinctive yellow cone. Includes the complete spec table and when it was made.
7000 (1978) — A pioneering high-efficiency passive loudspeaker system from British audio icon Celestion, known for its studio-monitor-inspired design and distinctive sound.
700SE — Celestion 700SE — a mid-1990s two-way floor-standing loudspeaker from the Hundreds Series, with Aerolam honeycomb enclosure and aluminum-dome tweeter. Little else is documented.
A4 — Celestion A4 bookshelf loudspeaker. Little is documented; known specs: 25W power handling, 4-8 Ohm impedance, original box survived.
BC3 (1970) — The Celestion BC3 is a classic 12-inch guitar speaker from the early 1970s, known for its balanced tone and dynamic response.
COUNTY (1978) — A rare British passive loudspeaker enclosure from the late 1970s, the Celestion COUNTY represents an early foray by Celestion into pre-packaged speaker systems for home use.
DITTON-10 (1977) — A pioneering British loudspeaker using advanced time-aligned driver technology for coherent sound staging. This page has the complete spec table.
DITTON-100 (1982) — A pioneering British loudspeaker with advanced time-aligned driver array and unique transmission line design. Includes the complete spec table.
DITTON-200 (1981) — A high-end passive loudspeaker from Celestion's innovative DITTON series, known for advanced crossover design and detailed sound reproduction.
DITTON-25 (1982) — A high-end British active loudspeaker system blending precision engineering with advanced time-aligned driver technology.
DITTON-300 (1982) — A high-end British loudspeaker known for precision imaging and advanced transmission line design. Covers full specifications and production years.
DITTON-33 (1977) — A groundbreaking British loudspeaker kit renowned for its time-aligned driver array and advanced acoustic design. Includes detailed specs.
DITTON-400 (1981) — A high-end active crossover and equalization module designed for precision speaker system integration. With detailed specs and production dates.
DITTON-44 (1980) — Celestion DITTON-44 (1973–1982) — 3-way, 4-driver passive loudspeaker with bass-reflex cabinet, 500/5000 Hz crossover. Includes production dates.
DITTON-44-MK-II (1981) — A high-end passive loudspeaker from Celestion's acclaimed DITTON series, known for precision imaging and advanced transmission line design.
DITTON-440 (1980) — A high-end active loudspeaker system from Celestion's innovative DITTON series, blending advanced crossover design with premium driver technology.
DITTON-66 (1977) — A legendary British loudspeaker known for its advanced transmission line design and refined midrange clarity. This page has the complete spec table.
DITTON-66-MK-II (1980) — A high-end passive crossover-equipped loudspeaker module designed for custom integration, known for its transparent sound and advanced driver technology.
DL4 (1978) — A compact bookshelf speaker from the late 1970s known for its detailed midrange and smooth high-frequency response. Find production years here.
DL4-SERIES-TWO (1982) — A high-efficiency passive loudspeaker system from Celestion's DL4 Series Two, known for its studio-monitor-inspired design and dynamic British sound signature.
Eight 15 — Celestion Eight 15 8-inch guitar speaker: 15W RMS, 95dB, ceramic magnet. Discover the 'fattest sounding' small cab upgrade with British tone.
G10 Gold — A 10-inch guitar speaker delivering classic British tone in a compact format, with 80-watt power handling and a ferrite magnet.
G10 Greenback — Celestion G10 Greenback 10-inch guitar speaker, 30W, 95dB sensitivity — compact driver with vintage tone and surprising low-end punch.
G12 Vintage — Celestion G12 Vintage 30 guitar speaker delivers 100dB sensitivity and 16 Ohm impedance — a top-selling rock driver with tight bass, fat mids, and smooth highs.
G12-100 Raven — Celestion G12-100 Raven — a newly launched 12-inch 100W guitar speaker with lightweight ceramic magnet, available in 8 and 16 ohm versions.
G12-ALNICO-BLUE (1966) — Legendary 12-inch alnico guitar speaker known for its smooth, dynamic tone and iconic use in rock and blues amplification.
G12-ALNICO-T530 (1967) — A legendary 12-inch alnico guitar speaker known for its sweet, dynamic tone and responsiveness, favored by rock and blues players in the 1960s and 70s.
G12-K85 (late 1970s) — A high-power ceramic-magnet guitar speaker designed for tight bass and clear mids at high volume. Covers full specifications and production years.
G12H (1965) — The legendary 12-inch guitar speaker known for its rich, warm tone and iconic midrange growl, a staple in rock and blues amplification.
G12H Anniversary — Celestion G12H Anniversary 12-inch guitar speaker reissue with 30W power, 1.42kg ceramic magnet, Made in England — key tone of 1970s rock
G12M (Greenback) (1966) — Legendary 12-inch guitar speaker known for its warm, punchy tone and iconic green dust cap. This page has the complete spec table and when it was made.
G12M-55 — Celestion G12M-55 Blackback 12-inch guitar speaker, 1970s 25-watt variant of the Greenback with 55Hz Pulsonic cone. Known in 8, 15, and 16 ohm versions.
G12S — A 80W guitar speaker designed as a high-power variant of the classic G12M Greenback. Includes detailed specs and production dates.
G12T-75 (1980s) — Celestion G12T-75: the 12-inch 75W guitar speaker that defined 1980s rock as the standard driver in Marshall 1960A/B cabinets.
HF1300 (1970) — High-frequency driver from the early 1970s known for smooth response and integration in high-fidelity speaker systems. Includes recent sold prices.
HF1400 (1970) — High-frequency driver from the early 1970s known for smooth response and integration in classic speaker systems. With production dates.
SL-600 — Celestion SL-600 (1982) — the world's first production loudspeaker with a metal (Aerolam) cone, the mini-monitor that launched the high-end era.
SL-700 — Celestion SL-700 compact two-way loudspeaker from the SL series; period reviews detail its Aerolam cabinet and 3 kHz crossover.
SL12 (1976) — Celestion's SL12 passive studio monitor, a pioneering British loudspeaker known for accurate sound reproduction and studio adoption in the 1970s–80s.
SL12SI (1985) — Celestion SL12SI: A rare and collectible studio monitor-grade speaker driver repurposed for high-end DIY audio builds. With detailed specs.
SL6 (1975) — Celestion SL6 (1982) bookshelf speakers with 6.5-inch PVC driver, 82dB sensitivity, 8Ω impedance — a compact British classic prized for clean, honest sound.
SL600 (1984) — The Celestion SL600: a landmark British loudspeaker that redefined high-end audio with its time-aligned design and transparent sound.
SL600SI (1985) — Celestion SL600SI mid-1980s bookshelf speaker with Aerolam cabinet and Bextrene driver — a British-engineered monitor prized for coherence and clarity.
SL6S (1980) — Celestion SL6S (c. 1980s) — 6.5-inch bookshelf speaker with woven polypropylene driver, soft dome tweeter, and studio-inspired neutrality.
SL6SI (1983) — High-efficiency bookshelf speaker with innovative SL6 driver and compact design. With detailed specs and production dates.
SRM-10 (1978) — A pioneering active studio monitor from the late 1970s, blending British engineering with early active speaker innovation.
SRM-12 (1978) — A pioneering British studio monitor that helped define the sound of professional audio in the late 1970s and 1980s. Covers the complete spec table.
SRM-15 (1980) — A pioneering active studio monitor from the early 1980s, blending British engineering with innovative self-powered design.
T1221 — Celestion T1221 12-inch guitar speaker, 25W ceramic-magnet Greenback variant. At 97dB, it delivers punchy mids and vintage rock tone.
T530 — Celestion T530 floor-standing 2-way loudspeaker, compound loaded, 55Hz-22kHz, 89dB sensitivity, 8 ohms. Little-documented model.
T5903 — Celestion T5903 guitar speaker — 8-inch, 15W, 4Ω. Known for balanced mids and chiming highs. Find current prices and vintage tone tips.
UL-10 — The Celestion UL-10 is a three-way acoustic-suspension speaker from the mid-1970s, documented in a January 1977 Audio magazine review. Little else survives.
VINTAGE-30 (1986) — Celestion Vintage 30 (1986) — 12-inch, 60W guitar speaker with ceramic magnet and a famous upper-midrange growl. The default voice of hard rock.

Other Models

Blue (G12) — Celestion Blue G12 alnico guitar speaker — the original alnico-magnet driver behind the British Invasion sound, fitted in Vox AC30s and early Marshalls.
CREAM — Celestion Cream G15C 15-inch guitar speaker, 75W, 99dB, ceramic magnet reissue of the vintage cream-label drivers. This page has production years.
CS 135 — Celestion CS 135 — the 8-inch dual-chamber subwoofer from Celestion's Trinity system, sold with the Celestion 1s for $399 in the early 1990s.
Fullback — Celestion Fullback G15V-100 15-inch guitar speaker, 100W peak, 8 ohms, 99dB sensitivity. Introduced c.2018 alongside the Cream.
G12M-25 — Celestion G12M-25 Greenback 12-inch guitar speaker — the 25W ceramic-magnet driver behind the classic Marshall Plexi crunch. Specs, conflicts, and collector notes.
G8C-15 — The Celestion G8C-15 — commonly sold under the name “Eight-15” — is an 8-inch, 15-watt, 8-ohm guitar speaker driver. Documentation from Celestion itself
Greenback G12M — If you've ever heard a Marshall stack on a classic rock record, you've heard this speaker. The G12M — nicknamed "the greenback" for its distinctive green
greenback-g10 — Celestion G10 Greenback 10-inch guitar speaker (2013–). 30W ceramic-magnet driver, 8 or 16 ohms, 95dB sensitivity. The 10-inch that thinks it's a 12-inch.
RUBY — Celestion Ruby: Celestion's only 8-inch guitar speaker, a 50W/8Ω workhorse with 98dB sensitivity and a 100Hz-5.5kHz range. Little else is documented.
SL700 SE — Celestion SL700 SE (1989) — Special Edition upgrade of the SL700 studio monitor with unique ribbon tweeter; praised by Stereophile for its imaging.
System 6000 — Celestion System 6000, an active studio monitor / dipole subwoofer from the SL600 era. 2-way active design, 32 Hz-25 kHz, 100W LF + 50W HF. Listed at $2,700/pair in 1989.
UL-6 — Celestion UL-6 compact bookshelf speaker from the mid-1970s. Little documented beyond launch ads claiming 35Hz-28kHz response and 20W continuous power handling.