JBL M151-8

The JBL M151-8 is a 15-inch, 8-ohm cone driver built for musical instrument use, part of JBL's MR series. It was listed at ¥50,000 per unit in Japan around 1992. It's a straightforward, high-output pro driver: 300 watts continuous power handling, 102 dB/W/m sensitivity, and a frequency characteristic of 40 Hz to 4 kHz at -10 dB, with a resonant frequency (fo) of 45 Hz. It weighs 8.4 kg and has a mounting depth of 188 mm.

JBL used a couple of notable technologies in this driver - their "SHG" magnetic circuit and a Thermoset composite voice coil, both aimed at keeping distortion low. The 38 cm aperture and response curve suit it to bass and low-frequency reproduction in instrument cabinets.

The documentation on this model is thin. Most of what's known comes from a single Japanese audio database entry, with impedance, power, and size corroborated by a New Old Stock reseller listing. A replacement flat-wire voice coil (SKU MWA1650-8) is available from a Queensland speaker repair shop, which suggests the driver remains serviceable. One Russian reseller listing called it a "very rare find" and noted it appears on the market only about once every 2,817 days.

Known specs:

- Type: 38 cm / 15" cone full-range unit (instrument use)

- Impedance: 8 Ω

- Power handling: 300 W continuous

- Sensitivity: 102 dB/W/m

- Frequency characteristic: 40 Hz - 4 kHz (-10 dB)

- fo: 45 Hz

- Depth: 188 mm

- Weight: 8.4 kg

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