JBL 2203A
The JBL 2203A is a 12-inch high-power woofer built for studio monitoring and pro sound. It powered a big chunk of the late-1970s and 1980s recording world. If you've heard a pair of JBL 4311s or L-100s, you've heard this driver doing the heavy lifting. The "A" suffix marks a later revision of the original 2203, which added a more rigid cone to an otherwise similar driver.
What's documented comes from a period flyer and a knowledgeable restorer, not a factory datasheet, so there are gaps. The flyer lists the 2203A as a professional-grade driver with a cast aluminum frame, a 20 oz AlNiCo magnet, and a frequency response of 34-5000 Hz. It was rated for 75W continuous program, though a restorer cautions that figure shouldn't be applied across the full 20-20k band. The same restorer gives a free-air resonance of 30.5 Hz, a figure he notes is often misquoted online, and a sensitivity of 92 dB 1W/1m. A serviceable unit should read about 6.4 ohms DC resistance. It has a 4-layer, 3-inch voice coil and a paper cone with cloth surround.
The 2203A was never meant to be a full-range driver. It was designed as the low/mid in three-way studio monitors, most famously the JBL 4310/4311/4312 series and the L-100 consumer speaker. It's a workhorse. It plays clean and loud and handles enormous power. One restorer calls its sound a classic "West Coast" sound, with a bit of a midrange hump in the 1-2k region in some implementations. It's a studio tool rather than a hifi statement. The same restorer is blunt about the downsides: it's not subtle, and running one full-range without a proper crossover will smoke it.
The most common failure after 30-40 years is dried-out, cracked cloth surrounds. Recone kits are readily available, and the driver is very repairable. But a voice coil rub often results from improper refoaming without shims, and the AlNiCo magnet can de-magnetize if dropped. A blown unit will read open or very low on a DCR meter. In the current market, a restored single 2203A can fetch around $395, while unrestored units with dried surrounds commonly sell in the $150 - $250 range as-is. As one restorer puts it: "There is no modern equivalent. If you want this sound, you buy these old drivers and rebuild them."
A 1980 classified listing in Audio (June 1980, p.116) shows the 2203A being liquidated alongside mixing consoles and equalizers.
Known specs, as documented:
- 12" woofer, 8 ohms nominal (6.4 ohms DCR)
- 75W continuous program (flyer rating; use with a real crossover)
- Frequency response: 34-5000 Hz (flyer); usable range in a 3-way system: 50 Hz - 2.5 kHz
- Fs: 30.5 Hz
- Sensitivity: 92 dB 1W/1m
- 20 oz AlNiCo magnet, cast aluminum frame
- 4-layer, 3-inch voice coil
- Approx. 24 lb
No original retail price or exact production years are documented. The flyer is undated, though the "A" revision is generally placed in the mid-to-late 1970s.
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