JBL SRX712M
A 33-pound stage monitor that handles 800 watts continuous and stands barely a foot tall — JBL's Differential Drive trick turned into a working tool.
Overview
The SRX712M is the little one in JBL's SRX700 line, a 12-inch two-way bass-reflex box that the company built to be a stage monitor first and a utility cabinet second. The pitch from JBL's own manual was blunt: build the lightest, smallest, loudest, clearest stage monitor possible. Whether they hit all four is a matter of taste, but the numbers are hard to argue with. The speaker weighs 15 kg (33 lb) and measures 349 x 546 x 260 mm (13.75 x 21.5 x 10.25 in) — in the monitor position it stands just over a foot high, which is why it disappears on a crowded stage instead of blocking sightlines.
The driver complement is a JBL 2262H 12-inch Differential Drive woofer with a neodymium magnet, paired with a 2431H compression driver on a 90° x 50° nominal horn. JBL rates the system at 800 W continuous, 1600 W program, 3200 W peak, into a nominal 8-ohm load. Sensitivity is quoted at 96 dB SPL (1 W, 1 m) in passive mode, and maximum output at 131 dB SPL at one meter. Frequency range is listed as 70 Hz – 20 kHz (-10 dB), with the tighter ±3 dB window given as 83 Hz – 18 kHz. That bottom-end rolloff is the honest part of the spec sheet: this is a monitor, not a full-range PA cabinet, and JBL's own documentation points users toward the SRX718S or SRX728S subwoofers when low-frequency extension matters.
Connectivity is two Neutrik Speakon NL-4 connectors, one on each end of the input plate — a small detail that pays off on dark stages where you're patching from whichever side happens to be facing you. There's a recessed high-current switch on the input plate to select full-range or bi-amplified operation, and the cabinet carries a dual-angle 35 mm pole socket plus two M10 fittings for suspension. The optional SRX712M-YK yoke bracket handles truss and suspension mounting. The enclosure is birch plywood finished in JBL's DuraFlex coating, with a wrap-around 16-gauge steel grille lined with acoustically transparent foam.
Contemporary reception was warm. Pro Audio Review (May 2006, p.16) covered the SRX700 series and came away calling the SRX712M a multipurpose cabinet equally capable as a monitor or a main — a fair summary of how the box actually gets used. In the same review (p.17), the writer noted that tilting the boxes down toward a seated audience minimized over-spray of the mids and highs and reduced unwanted reflections, and described the SRX712Ms as making for very intelligible sound in the audience near the stage. The reviewer's summary was that the cabinets had a wonderful sonic character, were amazingly lightweight, and were clean looking — and admitted to really falling in love with the SRX712Ms after using them as distributed speakers at corporate events. That's a working review, not a bench test, but it matches the design intent: a monitor that gets dragged from gig to gig and doesn't punish the person carrying it.
The horn's 90° x 50° pattern is worth dwelling on. JBL's manual says the wide horizontal coverage holds up regardless of where the performer stands, which is the practical argument for a monitor horn this wide — you don't have to plant yourself in one spot to hear yourself. The dual-angle pole mount gives 0° or 10° down-tilt when the box is used over a subwoofer or on a tripod, so the same cabinet covers both floor-monitor duty and front-of-house utility work. The biamp switch means the passive crossover can be bypassed when an external processor is available; JBL's manual notes the same switch arrangement appears across the SRX700 two- and three-way models.
Pricing at introduction was $1,199.00 according to Pro Audio Review (May 2006, p.16), which put it a few hundred dollars under the SRX715 at $1,569.00 in the same series. For a monitor that weighs 33 pounds and handles 800 watts continuous, that was a serious working musician's number, and it explains why the SRX712M turns up in rental inventories and install racks rather than only in bedrooms. One broadcast facility equipment list from the period shows SRX712Ms sitting alongside JBL VP-7215 and VP-7212 boxes in a performance lounge — the kind of deployment where a compact, high-output monitor earns its keep night after night.
What to watch for on the used market: the DuraFlex finish scuffs, and the foam behind the steel grille is the usual first casualty on any working box. The neodymium magnets in the Differential Drive woofers are the whole reason the cabinet is this light, so a blown 2262H is the expensive failure to check for — listen for rub and check the driver's impedance before handing over money. The recessed biamp switch can get bumped in transit, so verify the cabinet is in the mode you expect before you patch it in. None of this is exotic; it's the ordinary wear on a speaker that was built to be loaded into a van.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.