JBL 150-4C

Little is documented about the JBL 150-4C. The record shows a 4-1/2 inch woofer with a 4 ohm impedance. That is the whole verified spec sheet. No production years, no frequency response figures, no power handling data and no design details have survived in the sources available to the Archive.

The single listing that turned up described the driver as being in "Excellent!" condition, offered at $50.00. That price and the small driver size suggest a modest, utilitarian component, likely meant for a compact enclosure or as a replacement driver. Without corroborating documentation, that is inference, not fact. Period JBL advertising emphasized building high-fidelity systems with precision-made components, and positioned the brand's loudspeakers as the best available for hand-built systems Audiocraft (January 1958, p.7).

If you own a 150-4C or have come across period literature mentioning it, the Archive would welcome the details.