JBL SR4715A
The JBL SR4715A is a professional two-way loudspeaker from the SR4700 series. It is a 15-inch + 1-inch design, rated at 600 watts continuous program with a sensitivity of 99 dB. That is a box built to get loud and stay clean in front of a crowd.
The spec sheet lists a 2226H 15-inch low-frequency driver and a 2427H 1-inch high-frequency compression driver, crossed over at 300 Hz and 2.6 kHz. It is an 8-ohm cabinet with dual NL4 Speakon connectors, which was standard practice for the era - you could daisy-chain multiple boxes off one amplifier channel. Frequency response is given as 60 Hz to 18 kHz. The box weighs 94 pounds. Dimensions are roughly 23.5 x 23.5 x 20.4 inches, a near-square footprint typical of JBL's trapezoidal pro enclosures of the period.
Past the spec sheet, the documentation gets thin. No production years, original MSRP or marketing materials have surfaced. Period coverage in Pro-Sound (September 2013, p.48) shows the SR4715A in use for professional reinforcement at outdoor events.
A used SR4715A in excellent condition was listed at a special price of $399.95. At least one recone/repair shop lists the model as one it services, which suggests these cabinets are still out working. The 2226H woofer is a well-known JBL driver among collectors, and the 2427H compression driver is a titanium-diaphragm unit. There are no distortion figures, no dispersion data and no owner reviews.
- Type: Professional 2-way loudspeaker system
- Drivers: 1 x 2226H 15" LF, 1 x 2427H 1" HF compression driver
- Frequency response: 60 Hz – 18 kHz
- Sensitivity: 99 dB (1W@1m)
- Power: 600W continuous program
- Impedance: 8 ohms
- Crossover: 300 Hz, 2.6 kHz
- Inputs: 2 x NL4 Speakon
- Dimensions: 23.5 x 23.5 x 20.4 in (596 x 596 x 518 mm)
- Weight: 94 lbs (42.6 kg)
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