Short answer: choose between the JBL PRX912 and RCF ART 745-A MK4 by matching the speaker to the deployment rather than treating their ranking positions as a universal verdict. Coverage, cabinet format, bass extension, output capability, DSP, and service support all matter in a PA system. The RCF ART 745-A MK4 is discontinued; its replacement is the RCF ART 745-A MK5.
Why choose the JBL PRX912. High-quality manufacturer Spinorama data, 132dB claimed peak output, app control and unusually deep onboard processing make this one of the most versatile choices. The measured 54Hz bass extension is useful for speech and lighter music without a subwoofer.
Why choose the RCF ART 745-A MK4. The largest ART7 compression driver, 133dB claimed peak and a light 41.4 lbs (18.8 kg) enclosure give this discontinued flagship useful vocal headroom for a 15-inch box.
What to weigh before buying. Its 6.05 ideal-subwoofer preference score trails the QSC and FBT ProMaxX, with less even sound-power behavior in the supplied data. At 43 lbs (19.5 kg) it is not especially light, and Bluetooth is for control rather than audio streaming. The low-quality vendor data is truncated and does not yield a preference score. It is discontinued and is eclipsed by the better-supported ART 745-A MK5.
Buy the JBL PRX912 when its stated coverage, output, processing, and installation format fit the job better.
Buy the RCF ART 745-A MK4 when its stated strengths better suit the venue and the rest of the system.
Still deciding? The full PA & Live Sound rankings cover every ranked option.
A versatile, loud 12 inch powered PA speaker with app control, deep onboard processing and enough bass for speech and lighter music.
A discontinued 15 inch powered PA speaker with a large compression driver for strong vocal headroom in a fairly light cabinet.
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Specifications Side By Side
| JBL PRX912 | RCF ART 745-A MK4 | |
|---|---|---|
| Price | $899.00 | $1,699.00 Discontinued |
| Ranked | #6 of 83 in 12-Inch PA Speakers | #44 of 76 in 15-Inch PA Speakers |
| Passive | No | No |
| Configuration | Active 2-way bass-reflex PA speaker | Active 2-way bass-reflex PA speaker |
| Drivers | 12” woofer, 1.5” compression driver | 15” woofer, 1.4” exit/3” diaphragm compression driver |
| Frequency Response | 50Hz - 20kHz (-10dB, manufacturer specified) | 45Hz - 20kHz (manufacturer specified) |
| Bass Extension (-3dB) | 54Hz (measured, vendor Spinorama data) | 65Hz (measured, vendor Spinorama data) |
| Coverage | 90° x 50° | 100° x 60° |
| Maximum SPL | 132dB peak (manufacturer specified) | 133dB peak (manufacturer specified) |
| Inputs | 2 x XLR/TRS combo, 3.5mm aux | XLR/jack combo input; XLR output |
| App | Yes (JBL Pro Connect) | - |
| DSP | Yes | Yes, FiRPHASE, EQ, limiting and protection |
| Bluetooth | Control only; no Bluetooth audio | No |
| Weight | 43 lbs (19.5 kg) | 41.4 lbs (18.8 kg) |
| Dimensions | 25”H x 15.5”W x 13.1”D (636 x 394 x 332 mm) | 27.9”H x 17.4”W x 15.2”D (708 x 442 x 387 mm) |
| Amplifier Power | 2000W peak / 1000W RMS | 1,400W peak / 700W RMS (1,000W LF + 400W HF peak, manufacturer specified) |
| Crossover Frequency | 1920Hz | 650Hz (manufacturer specified) |
| Cabinet Material | Polypropylene/talc composite | Polypropylene composite |
| Rigging | 6 x M10 suspension points; dual 36mm pole sockets | M10 fly points; pole mount |
| Spinorama Preference Score | 3.57 | - |
| Spinorama Preference Score with Perfect Sub | 6.05 | - |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | Yes | Yes |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | Yes | No |
| Microphone Input | No | No |
| Guitar Input | No | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: JBL PRX912 (measured by the manufacturer) and RCF ART 745-A MK4 (measured by the manufacturer), via spinorama.org.
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