JBL SR4704A
The JBL SR4704A is a professional floor monitor from JBL's SR Series. It's a two-way, bass-reflex design built around the company's pro-grade components. The 38 cm cone woofer 2226H handles the low end and uses the company's VGC (Vented Gap Cooling) system. High frequencies come from a 2426H compression driver mounted on a 2370A flat-front biradial horn with 90° horizontal dispersion. The enclosure is angled at 45° for floor monitoring duty. It has a built-in crossover network and a switch for two-way bi-amplified operation. For external multi-amp setups, the recommended crossover point is 1.2 to 1.4 kHz.
The specs are solid for a stage monitor of this class. Sensitivity is rated at 97 dB/W/m, nominal impedance at 8 ohms, and frequency response at 40 Hz to 18 kHz (-10 dB). The woofer section handles 600W continuous pink noise, and the high-frequency section is rated at 100W. Dimensions are 635 mm wide, 600 mm high and 850 mm deep. It weighs 34.5 kg.
Little is documented about the SR4704A's production history. The only dated price references come from Japanese sources - approximately ¥230,000 per unit around 1994 and ¥213,000 around 1997 - and no official production years have been confirmed. The model appears in period equipment listings and is still in use among working sound engineers. One owner on a pro audio forum noted that a pair in decent secondhand shape went for $100, and said they make "great drum monitors or side fills." Another user reported needing replacement compression drivers on their pair. A used listing from Belarus offered a single unit for 1,500 Belarusian rubles. The SR4704A belongs to JBL's Speaker Rail Series, which also includes the SR4725, SR4725A, and SR4704 models.
Known specifications:
- Type: 2-way, 2-speaker, bass reflex, floor monitor
- Low frequency: 38 cm cone (2226H, VGC system)
- High frequency: horn type (2426H driver + 2370A biradial horn)
- Frequency response: 40 Hz – 18 kHz (-10 dB)
- Nominal impedance: 8 Ω
- Sensitivity: 97 dB/W/m
- Dispersion: 90° H x 40° V
- Crossover: 1.1 kHz (passive); 1.2–1.4 kHz recommended for bi-amp
- Power handling: 600W (LF) / 100W (HF), continuous pink noise
- Dimensions: 635 x 600 x 850 mm (W x H x D)
- Weight: 34.5 kg
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