JBL G125-8
Little is documented about the JBL G125-8 beyond its own spec sheet and a listing title. What the record shows is a 12-inch, 8-ohm low-frequency driver from JBL's professional line — a paper-cone woofer with a 2.5-inch voice coil and a 60 oz. ferrite magnet, rated at 100W continuous sine wave (200W program recommended from the amplifier). JBL's figures put frequency response at 60Hz–4kHz and sensitivity at a claimed 105 dB at 1W/1m, which points to a high-output PA or instrument application rather than a home hi-fi woofer. Mounting is on an 11-1/8" bolt circle, the driver is 5-1/2" deep, and it weighs 10 lb.
That is about all there is. No production years, no original price, no Thiele-Small parameters, and no owner or repair history have surfaced. A period review is on record in Sound and Communication (January 1988, p.28), but only its existence is known. The content isn't available here, so what the reviewer heard is unknown. Corroboration is thin: an eBay listing title confirms the 12-inch size, the 8-ohm impedance, and "vintage USA made" origin, and nothing more. One indirect German restoration price list mentions vintage JBL speakers such as the D130 and D120, but not the G125 itself, so it says nothing specific about this driver.
The JBL manual material does show where the G125-8 sat in the catalog. It appears in JBL's repair-kit cross-reference as the driver covered by kit C8RG125-8, which also covers the G125A-8. That's useful if you're hunting a recone. It also shows up as the low-frequency unit in two G-series Performance systems: the G-730 two-way (paired with the G-791 high-frequency power pack, a 2371 horn and 2416H driver) and the Control 12SR. JBL's own instrument-speaker listing describes it simply as "12" guitar, bass, vocal."
Treat every spec above as single-source until you can cross-check it against an original JBL sheet.
- Type: 12" low-frequency driver, 8 ohms
- Power: 100W continuous sine wave / 200W program
- Frequency response: 60Hz – 4kHz
- Sensitivity: 105 dB @ 1W, 1m (manufacturer figure)
- Voice coil: 2.5" · Cone: paper · Magnet: 60 oz. ferrite
- Dimensions: 12" dia. × 5-1/2" depth · 10 lb. · 11-1/8" bolt circle
- Repair kit: C8RG125-8 (shared with G125A-8)
- Used in: G-730 system, Control 12SR
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