JBL 4315/4315WX (1975)
The JBL 4315 is a four-way, four-speaker bass reflex studio monitor introduced in 1975. It was the smallest system in JBL's professional studio monitor line. It's a bookshelf-type design, though at 850 mm tall and 41 kg, "bookshelf" is stretching it. All four drivers are JBL: a 30 cm cone woofer (2203A), a 20 cm cone mid-bass (2108), a 13 cm cone mid-high (2105), and a horn-type high-frequency driver (2405). The crossover points are 400 Hz, 2 kHz, and 8 kHz. Impedance is 8 ohms and rated output is 89 dB (New JIS). Frequency response is specified at 35 Hz to 20 kHz ± 3 dB, with allowable input of 60W continuous program.
The enclosure is bass reflex, with one notable internal detail. The mid-bass driver gets its own separate sealed enclosure, installed to eliminate mutual interference between the units. The front panel carries level controls for the mid-bass, mid-high, and high-frequency ranges. The 4315 came in two finishes - a gray version and a walnut version, the latter designated 4315WX. Pricing at release was ¥455,000 for the 4315 and ¥470,000 for the 4315WX, per unit.
Documentation on this model is thin beyond the basic spec sheet. The 4315WX in particular is almost completely absent from the surviving record. Even the Japanese databases that catalog the 4315 list the WX variant with little more than its price and finish.
Dating is a bit messy. Most sources place the 4315 at 1975, though some listings give a 1978-80 span, and a forum thread references a 1973 4315A. The 1975 date from the Japanese spec sheets is the most consistent, but the production span is not firmly pinned down in the available record.
- Type: 4-way, 4-speaker, bass reflex, bookshelf
- Drivers: 2203A (30 cm woofer), 2108 (20 cm mid-bass), 2105 (13 cm mid-high), 2405 (horn tweeter)
- Crossover: 400 Hz / 2 kHz / 8 kHz
- Impedance: 8 Ω
- Output: 89 dB (New JIS)
- Frequency response: 35 Hz – 20 kHz ± 3 dB
- Power handling: 60W continuous program
- Enclosure volume: 73.8 L (mid-bass sub-enclosure: 2.8 L)
- Dimensions: 520 × 850 × 280 mm
- Weight: 41 kg
- Price (1975): ¥455,000 (4315) / ¥470,000 (4315WX), per unit
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