JBL SR4733A
The SR4733A is a professional three-way, bass-reflex loudspeaker from JBL's SR (Sound Reinforcement) series, the SR4700 line to be specific. It was built for high-level monitoring in fixed installations and for sound reinforcement work. It's a 110-pound trapezoidal enclosure designed to be flown or stacked, not tucked into a living room. The spec sheet lists a 15" woofer (either the 2225H or 2226H - JBL's own literature cites both, and the two appear to have been interchangeable fits), a pair of 6.5" 2118H midranges, and a 1" exit 2417H compression driver on a horn. Crossover points are 700 Hz and 5 kHz.
Sensitivity is rated at 105 dB (1 W / 1 m), which is very high. These get loud on modest power, and they'll take 250 W continuous, 500 W program, and 1000 W peak. Frequency response is given as 40 Hz to 20 kHz, with 70° x 40° dispersion. Inputs are professional-grade: two Neutrik NL4MP speakON connectors plus a 1/4" jack. Dimensions are 39" x 20" x 20", and each cabinet weighs 110 lb.
The professional sound-reinforcement market didn't get the enthusiast press coverage that home hi-fi got, so period reviews are scarce. Coverage in EQ Magazine (March 1998, p.120) noted the monitor system was powerful enough that the engineer had to be careful not to encroach on the house mix.
No production years, original price, or launch context have surfaced in the available documentation. Current market listings show pairs trading in the low four figures. The record on this model is otherwise thin. It's a working tool from JBL's professional line, and most of what's known about it comes from the spec sheet.
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