JBL 3145 (Stereonomma)

The JBL 3145 — sometimes listed under the curious name "Stereonomma" — is a 3-way loudspeaker. It's a model that appears in period equipment directories but has left a surprisingly thin paper trail; there's no surviving production-year data, original price, or owner documentation that we've been able to track down. What the record does show is a fairly classic JBL configuration for the era: a 1-inch titanium dome tweeter, a 5-inch midrange, and a 10-inch woofer measuring 23.5" H x 14.75" W x 11.25" D and weighing 42 lbs.

Electrically, the 3145 was rated at 8 ohms with a crossover at 2800 Hz and a sensitivity of 90 dB (1W/1m). Power handling was spec'd at 75–150W, and frequency response at 40Hz–20kHz (±3dB). High Fidelity (May 1978, p.10) teased a forthcoming test report on new JBL models in its "Coming Next Month" column, but no full review of the 3145 appears in the archives we have access to — so we can't say how it actually performed or sounded in a listening room.

On the used market, the 3145 has been listed in the $450–$650 range, which suggests collectors have some interest, but there's no documented history of common failures, spare parts availability, or owner forum discussion to round out the picture. If you own a pair, you'd be adding genuinely new information to the record.

Known specs: