JBL SR2050
The JBL SR2050 is a professional two-way vented loudspeaker built around a 15-inch woofer (M115-8A) and a 1-inch polycarbonate-diaphragm compression driver (2417H). It was part of JBL Professional's SR series, which was aimed at sound reinforcement rather than home hi-fi. The record on this model is thin - no production years or original pricing have surfaced - but the manufacturer's own archive and retailer listings fill in most of the technical picture.
It's a straightforward, high-output design: a 15-inch two-way vented enclosure with a nominal impedance of 4 ohms and a rated sensitivity of 100 dB SPL (1 W @ 1 m) per the JBL Professional Archive. A Parts Express listing shows 97 dB, but the manufacturer figure is the more reliable one. Maximum power handling is rated at 200 watts RMS, with program power at 400 watts. The sources disagree on the crossover point too. Parts Express lists 1.3 kHz, while the JBL Professional Archive specifies 3.5 kHz. With a 15-inch woofer in a two-way, the manufacturer's 3.5 kHz figure is the more plausible one.
Dispersion is rated at 100° horizontal by 80° vertical (-6 dB). The frequency range runs from 50 Hz to 18 kHz (-10 dB from rated bandwidth). Input connections are a Neutrik Speakon NL-4MP and a 1/4-inch phone jack, both standard pro-audio connectors of the era.
Known specs, as documented:
- Type: Two-way, vented, 15" LF driver
- LF driver: M115-8A 15"
- HF driver: 2417H 1" polycarbonate diaphragm
- Frequency range: 50 Hz – 18 kHz (−10 dB)
- Sensitivity: 100 dB SPL (1 W @ 1 m) — manufacturer spec
- Impedance: 4 ohms nominal
- Power: 200 W RMS / 400 W program
- Dispersion: 100° H × 80° V (−6 dB)
- Inputs: Neutrik Speakon NL-4MP, 1/4" phone jack
Surviving examples show typical wear for a working pro speaker. The commonly cited issues are delaminated insulite backing, dead tweeters, cracked cabinets, and broken terminal blocks. One used example recently traded around $300. Period tour production listings show JBL and other brands in the equipment inventories of major acts, as documented in Pro-Sound (August 2015, p.46).
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