Short answer: choose between the RCF KX 45-A and JBL PRX915 for the requirements of the venue and system, not from rank alone. In this size class, coverage, bass extension, output capability, DSP, cabinet construction, and service support often decide the better fit.
Why choose the RCF KX 45-A. RCF’s flagship 15-inch point source pairs a 3200W amplifier with a 3-inch titanium-dome compression driver, RDNet remote control and a 137dB claimed peak, the highest maximum-output claim in this ranking. Rotatable 100° x 70° coverage suits both main and monitor use.
Why choose the JBL PRX915. High-quality vendor data shows a 4.77 ideal-subwoofer preference score with 51Hz measured extension, backed by JBL’s extensive service network and 12-band parametric EQ with dbx DriveRack feedback suppression carried over from the PRX912.
What to weigh before buying. The local measurement is truncated and cannot produce a preference score. At 62.6 lbs (28.4 kg) it is one of the heaviest boxes here, and pricing/retail availability are not yet established. Its measured preference trails the 12-inch PRX912, and at 53.1 lbs (24.1 kg) it is meaningfully heavier to carry to a gig than the smaller model.
Buy the RCF KX 45-A when its stated coverage, output, processing, and deployment format best match the job.
Buy the JBL PRX915 when its stated strengths are the better match for the room and the rest of the PA.
Still deciding? The full PA & Live Sound rankings cover every ranked option.
A flagship powered 15 inch PA speaker with huge amplifier power, very loud peaks, remote control and rotatable coverage.
A powered 15 inch PA speaker with good sound, fairly deep bass, app control and built in EQ and feedback suppression.
Prices on this page were last checked October 23, 2026 at 8:27 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| RCF KX 45-A | JBL PRX915 | |
|---|---|---|
| Price | $4,618.50 | $999.00 |
| Ranked | #5 of 76 in 15-Inch PA Speakers | #15 of 76 in 15-Inch PA Speakers |
| Passive | No | No |
| Configuration | Active 2-way bass-reflex point-source PA speaker | Active 2-way bass-reflex PA speaker |
| Drivers | 15” neodymium woofer, 1.4” exit/3” dome compression driver | 15” woofer, 1.5” compression driver |
| Frequency Response | 50Hz - 20kHz (manufacturer specified) | 48Hz - 19kHz (-10dB, manufacturer specified) |
| Dimensions | 27.8”H x 16.5”W x 16.9”D (705 x 419.6 x 430 mm) | 28.2”H x 18.3”W x 15.1”D (717 x 465 x 383 mm) |
| Coverage | 100° x 70°, rotatable | 90° x 50° |
| Maximum SPL | 137dB peak (manufacturer specified) | 133dB peak (manufacturer specified) |
| Inputs | XLR audio input/link and EtherCON RDNet | 2 x XLR/TRS combo, 3.5mm aux; 2 x XLR thru and XLR mix outputs |
| Amplifier Power | 3200W peak (2000W LF + 1200W HF) | 2000W peak / 1000W RMS |
| Crossover Frequency | 750Hz | 1920Hz |
| Cabinet Material | Baltic birch plywood | Polypropylene/talc composite |
| Rigging | Quick-lock rigging; 6 x M10 inserts; 35mm pole mount | 6 x M10 suspension points; dual 36mm pole sockets |
| Network Control | RDNet | - |
| DSP | Yes, FiRPHASE, Bass Motion Control, presets and RDNet | Yes, 12-band parametric EQ and dbx DriveRack |
| Bluetooth | No | Yes, control via JBL Pro Connect app |
| Weight | 62.6 lbs (28.4 kg) | 53.1 lbs (24.1 kg) |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | No | Yes |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Microphone Input | No | No |
| Guitar Input | No | No |
| Bass Extension (-3dB) | 54.5Hz (measured, manufacturer spinorama data) | 58Hz (measured, vendor Spinorama data) |
| Spinorama Preference Score | - | 2.40 |
| Spinorama Preference Score with Perfect Sub | - | 4.77 |
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: RCF KX 45-A (measured by the manufacturer) and JBL PRX915 (measured by the manufacturer), via spinorama.org.
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