JBL C37 (late 1950s)

The JBL C37 is a compact bookshelf speaker from the late 1950s, part of JBL's C-series home loudspeaker line. It was positioned as a smaller, more affordable companion to the larger C50 and C60 models — a way to get JBL's engineering into a smaller room and a smaller budget. The C37 uses an acoustic suspension (sealed cabinet) design with front-firing drivers: an 8-inch woofer paired with an LE20-1 tweeter, crossed over at 2,500 Hz. Nominal impedance is 8 ohms.

Documentation on the C37 is thin. No original price, dimensions, weight, or numerical frequency response figures have surfaced, and no period reviews have been found — the only JBL advertising from the era that survives in the record is general brand promotion, not model-specific coverage. Audio (November 1958, p.29) ran JBL's corporate advertising touting the company's edge-wound aluminum ribbon voice coils and rigid cast frames, but nothing about the C37 specifically.

What the collector market does tell us: the C37 is prized for its compact size and classic late-1950s JBL sound, and good-condition examples typically sell in the $400–$800 range. The known weak point is the woofer surround — foam surrounds deteriorate with age and commonly need replacement, which is a straightforward repair since replacement surrounds are readily available from parts suppliers. Original LE20-1 tweeters can still be found as new old stock from some dealers. Walnut cabinets are prone to veneer damage, so condition varies considerably.

Known specs: