JBL K151
The JBL K151 is a 15-inch loudspeaker driver from JBL's professional series. That's about all the record firmly establishes. It appears in the JBL Database as a professional-series 15" driver, and a Markaudio video identifies a "JBL K151 16 ohm" unit. The most commonly cited impedance is 16 ohms, though at least one forum poster has claimed the K151 is a 4-ohm driver — a single, uncorroborated statement that conflicts with the two independent 16-ohm sources. Contemporary coverage of professional sound reinforcement in Modern Recording (December 1977, p.39) discusses dividing a frequency range into four separate areas for speaker cabinets, though it does not mention the K151 by name.
Beyond those basics, the documentation is thin. No production years, original price, frequency response, sensitivity, or power handling figures have surfaced. No Thiele-Small parameters, voice coil diameter, magnet weight, or cone material specs are recorded. The K151's intended application isn't stated by JBL in any available material, though one Vintage JBL Forum user mentions it was "a 15 inch driver used in bass guitar cabs" — a plausible use for a professional-series 15, but a single unverified claim.
Known specs:
- **Driver size:** 15 inch
- **Impedance:** 16 ohms (per JBL Database and Markaudio Video; a single forum post claims 4 ohms)
- **Series:** JBL professional series
There's no documented relationship to other JBL 15-inch drivers like the K140, K145, or E140, and no owner reviews — positive or negative — appear in the record. If you own a K151 and know more, the archive would welcome the details.
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