JBL TM620 (c. 1990)
The JBL TM620 is a 2-way in-vehicle speaker system from around 1990. It was originally priced at ¥50,000 per unit in Japan. It's a 160mm (roughly 6.5-inch) speaker with a 4-ohm impedance, rated for 80W input. Frequency response is 50 Hz to 27 kHz, and output sound pressure level is 91 dB.
The engineering is interesting for late-80s/early-90s JBL. The low range uses a polypropylene cone and the high range a pure titanium diaphragm. The magnetic circuit is a low-distortion SFG design with an edge-wise wound voice coil. Examples seen on the secondhand market are marked "Made in USA."
Documentation on the TM620 is thin. No production years, dimensions or crossover details have surfaced, and what exists is mostly scattered marketplace listings. One owner on a Spanish-language forum mentions using TM620s alongside Infinity Kappa 6x9" drivers in DIY enclosures, worried the combination "might not have a coherent sound." Used units have appeared on Carousell Philippines at PHP 3,000 (one of a pair reportedly non-functional) and PHP 6,000. A Wallapop listing in Terrassa, Spain, offered a "new" black-and-silver unit without its box.
- Type: 2-way in-vehicle speaker system
- Impedance: 4 Ω
- Frequency response: 50 Hz – 27 kHz
- Allowable input: 80W
- Output SPL: 91 dB
- Aperture: 160mm
- Original price: ¥50,000 (1 unit, c. 1990)
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