JBL 4315A/4315WXA (1976)
The JBL 4315A/4315WXA is a compact four-way studio monitor from JBL's professional 43XX series, released in 1976. It packs four drivers into a bookshelf-style bass-reflex cabinet, and at 43 kg that cabinet is a stretch of the word "bookshelf." The low end is handled by a 30 cm cone woofer (2203A). A 20 cm cone (2108) covers the mid-low range, a 13 cm cone (2105) covers the mid-highs, and a horn-type 2405 driver takes the top end. Crossovers sit at 400 Hz, 2 kHz, and 8 kHz. The rated band is 35 Hz to 20 kHz ±3 dB. Impedance is 8 ohms, sensitivity is 89 dB (New JIS), and allowable input is 60W RMS.
Two appearance variants were offered: the 4315A in a gray finish with a black grille, and the 4315WXA in walnut with a blue grille. The drivers use alnico magnets, which is a big part of why collectors still go looking for these. The enclosure is bass-reflex, and the cabinet has support fittings on the back so it can be suspended. Japanese market pricing around 1978 was ¥350,000 for the 4315A and ¥360,000 for the 4315WXA, per unit.
Documentation on this model is thin. The 43XX series as a whole earned a world-class reputation as monitors, and the 4315's four-way alnico design has kept it a cult favorite. A used pair sold in Brisbane for $2,200, and a Japanese auction listing for a walnut pair with stands closed at ¥201,300 in 2022. Beyond that, the written record is sparse: no period reviews, no production end date, and little on how the 4315A compares to its siblings like the 4315B.
Known specs:
- Type: 4-way, 4-speaker, bass-reflex, bookshelf monitor
- Drivers: 30 cm woofer (2203A), 20 cm mid-woofer (2108), 13 cm mid-high (2105), horn tweeter (2405)
- Crossover: 400 Hz, 2 kHz, 8 kHz
- Frequency response: 35 Hz – 20 kHz ±3 dB
- Impedance: 8 ohms
- Sensitivity: 89 dB (New JIS)
- Power handling: 60W RMS
- Dimensions: 521 × 854 × 327 mm
- Weight: 43 kg
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