JBL SR4718A
The SR4718A is a pro subwoofer from JBL's SR series, a line of small-format speaker systems aimed at commercial sound: nightclubs, houses of worship, installations. It's a 1-way, bass reflex, floor-standing cabinet built around a single 46 cm (18″) cone woofer, the 2241G, which uses JBL's VGC system. The cabinet is tall and trapezoidal - "not the cubes," as one owner on the ProSoundWeb forums put it. It's meant to be paired with SR series tops like the SR4722A, SR4725A, or SR4735A, with a recommended external crossover of 80-100 Hz.
The numbers are respectable for a pro sub of this era. Sensitivity is 98 dB/W/m, handling is 600W continuous pink noise (IEC), nominal impedance is 4 ohms, and frequency response is 30 Hz to 3.3 kHz at −10 dB. The cabinet is big at 635 × 1,092 × 460 mm (about 25″ × 43″ × 18″) and heavy at 39.5 kg (87 lbs). Japanese listings show it priced at ¥180,000 per unit around 1994 and ¥167,000 around 1997.
Documentation on this model is thin. There's no confirmed production span, no Thiele/Small parameters, and no detail on the enclosure construction beyond "bass reflex." The 2241G driver is sometimes described as using a "Differential Drive" magnet, but the more detailed Japanese source specifies the VGC system. The two claims may not be mutually exclusive, but neither is corroborated. No original owner's manual or service literature surfaced in research.
The record does show how these were actually used. A Klipsch community member who tried driving a pair with a 30-watt Marantz 1060 reported getting "no volume out of them," and concluded they're "just about subwoofers." Another owner on ProSoundWeb described a pair in "like new condition, maybe one gig," and offered them for sale. A seller on Craigslist noted their pair was "in excellent condition for their age with very minimal show of wear." One TikTok listing claims the SR4718A was "Made in California."
Known specs, as documented:
- 1-way, 1-speaker, bass reflex, floor type
- 46 cm cone woofer (2241G) with JBL VGC system
- Frequency response: 30 Hz - 3.3 kHz (−10 dB)
- Allowable input (IEC): 600W continuous pink noise
- Nominal impedance: 4 Ω
- Sensitivity: 98 dB/W/m
- Recommended crossover: 80-100 Hz (external, with full-range tops)
- Dimensions: 635 W × 1,092 H × 460 D mm
- Weight: 39.5 kg
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