Celestion Ruby
The Celestion Ruby is the only 8-inch guitar speaker in Celestion's range, per Celestion's own classification. That is the clearest thing on record about it. It was described as Celestion's "8-inch workhorse," a small driver aimed at guitar use rather than full-range hi-fi duties.
What the spec sheet shows is a compact, efficient unit. The Ruby is rated at 50W with an 8Ω impedance, and its sensitivity is a healthy 98dB (1W/1m). The frequency range is listed at 100Hz–5.5kHz — a deliberately narrowed band, consistent with a guitar speaker designed to do its work in the midrange rather than reproduce the full audio spectrum. The driver uses a 1.25" round copper voice coil, a ferrite magnet weighing 350g, a treated paper cone with cloth surround, and a solid paper dust cap. The chassis is pressed steel, and the whole thing weighs 1.05kg, with an overall diameter of 206mm and a depth of 59mm. It mounts with four holes on a 186mm cut-out.
Past those specifications, the record is thin. No production years, original pricing, or recommended amplifier pairings are documented. The model does show up occasionally in period classified ads - Audio (February 1985, p.123) listed a used pair of Celestion DT250 speakers, and other classified mentions of Celestion drivers from the same era surface in Audio's mail-order pages - but the Ruby itself doesn't appear to have gotten any formal review coverage. There are no owner testimonials, no service documentation and no secondhand market data.
Known specs:
- 8" guitar speaker, 50W power handling, 8Ω impedance
- Frequency range: 100Hz–5.5kHz; sensitivity 98dB (1W/1m)
- 1.25" round copper voice coil; ferrite magnet, 350g
- Treated paper cone, cloth surround, solid paper dust cap; pressed steel chassis
- Overall diameter 206mm, depth 59mm, weight 1.05kg; 4-hole mounting, 186mm cut-out
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