JBL D175
The JBL D175 is a 12-inch full-range loudspeaker driver. The surviving documentation points at one intended role: guitar amplification. Classic Speaker Pages notes it was designed for guitar amp use and says it is "not recommended for home stereo use." This was a working musician's driver, not a hi-fi component.
The spec sheet shows a big, efficient unit. The D175 is rated at 8 ohms impedance, with a 3-inch voice coil and a 1.08 Tesla magnet assembly. Frequency response runs 45 Hz to 4 kHz, and sensitivity is rated at 96 dB/W/m. Power handling is listed at 75 watts continuous sine wave and 150 watts of program material. Those are numbers for a driver meant to take punishment on stage. Net weight is 18 lbs.
If you own a D175 or have come across period literature that mentions it, the Archive would welcome the details. For now, this page stands as a record of a driver that filled a specific, practical niche and then slipped quietly out of the historical spotlight.
- Type: Full-range driver, designed for guitar amplifier use
- Cone size: 12 inch
- Impedance: 8 ohms
- Voice coil: 3 inch
- Flux density: 1.08 Tesla magnet assembly
- Frequency response: 45 Hz – 4 kHz
- Sensitivity: 96 dB/W/m
- Power handling: 75W continuous sine wave; 150W program
- Net weight: 18 lbs
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