Celestion Fullback (c. 2018–)
The Celestion Fullback — formally the G15V-100 — is a 15″ guitar speaker that Celestion introduced alongside the Cream model, announced in a Vintage Guitar piece covering both speakers. It's a comparatively recent addition to the Celestion lineup, pitched as a modern take on the classic British voice in a larger cone format. While the Blue and Greenback models dominate the brand's legacy narrative, the Fullback has carved out a niche among players wanting that character from a 15″ driver.
The core spec sheet is straightforward: a 100-watt peak / 50-watt nominal rating, 8-ohm impedance, 99dB sensitivity, and a frequency range of 65 to 4,000Hz. Vintage Guitar (which covered the speaker's introduction) noted the 2″ copper voice coil, ceramic magnet, and pressed-steel chassis. The design intent, as described in that same coverage, was to retain Celestion's harmonically complex mid-range while the larger cone shifts that character down a register — essentially a bigger-voiced take on the classic formula. It's built to handle high-gain amplifiers without choking, which suggests a modern voicing rather than a strict vintage reissue.
Forum reaction has been genuinely enthusiastic. One user on The Gear Page called it "my favorite Celestion speaker at the moment," and another chose it specifically to avoid the JBL route, noting that "the frequency plot tells the story." A Marshall Amp Forum user was weighing it for early Stevie Ray Vaughan-style tones. A YouTube comparison from 2018 pitted the Fullback against a 1972 Pre-Rola Greenback (a G15M-50), which gives some sense of where Celestion intended it to sit sonically — and confirms it was in production by then. A Telecaster Guitar Forum user described their example as having a plain aluminum, unpainted frame with no cooling fins on the magnet.
One point of confusion in the record: the model code appears as both T5948 and T5971 across different listings. The more commonly cited code in enthusiast discussion is T5948, but the discrepancy is unresolved in the documentation I've found. Retail pricing has been seen around $110, though no auction history or collectibility data has surfaced — this is a working speaker, not yet a collector's item.
What's genuinely thin here: no production years beyond the implied 2018-or-later window, no physical dimensions or weight, no magnet weight spec (one forum user correctly noted Celestion doesn't publish it for this model), and no formal review from the major hi-fi publications — this is squarely a guitar speaker, so it lived in the pages of guitar magazines and forums rather than the audio press. The Fullback appears to still be a current or recent production model, but Celestion's own catalog pages for it are not part of this archive's documentation.
Known Specifications
- 15″ guitar speaker
- 100W peak / 50W nominal power handling
- 8 ohms impedance
- 99dB sensitivity
- Frequency range: 65–4,000Hz
- 2″ copper voice coil
- Ceramic magnet
- Pressed-steel chassis
- Model codes: G15V-100 (primary), T5948 / T5971 (conflicting sources)
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