Short answer: choose between the RCF KX 45-A and RCF NX 945-A for the deployment, not from the automatic ranking alone. Their driver format, power requirements, coverage, bass reach, output capability, and control features determine which is the more practical PA for a particular room or system.
The case for 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.
The case for the RCF NX 945-A. The top NX-series 15-inch box pairs a plywood cabinet with a 135dB claimed peak, the highest in the NX range, and a wide 100° x 70° pattern. RCF’s FiRPHASE and Bass Motion Control processing carry over from the smaller NX models.
Important trade-offs. 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. The measurement is truncated and does not produce a preference score, so its tonal position relies on published engineering rather than a confirmed result. At 60.2 lbs (27.3 kg) it is heavier than the ART 945-A alternative.
Buy the RCF KX 45-A when its stated format, coverage, and system features fit the job better.
Buy the RCF NX 945-A when its stated output, control, and deployment strengths better match the system.
Want more options? Browse the full PA & Live Sound rankings.
A flagship powered 15 inch PA speaker with huge amplifier power, very loud peaks, remote control and rotatable coverage.
A loud powered 15 inch PA speaker in a plywood cabinet with wide coverage and onboard processing that keeps bass tidy.
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 | RCF NX 945-A | |
|---|---|---|
| Price | $4,618.50 | $2,299.00 |
| Ranked | #5 of 76 in 15-Inch PA Speakers | #8 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, compression driver |
| Frequency Response | 50Hz - 20kHz (manufacturer specified) | 45Hz - 20kHz (manufacturer specified) |
| Dimensions | 27.8”H x 16.5”W x 16.9”D (705 x 419.6 x 430 mm) | 27.8”H x 16.5”W x 17.8”D (705 x 420 x 451 mm) |
| Coverage | 100° x 70°, rotatable | 100° x 70° |
| Maximum SPL | 137dB peak (manufacturer specified) | 135dB peak (manufacturer specified) |
| Inputs | XLR audio input/link and EtherCON RDNet | XLR/TRS combo input and XLR output |
| Amplifier Power | 3200W peak (2000W LF + 1200W HF) | 2100W peak (1400W LF + 700W HF) |
| Crossover Frequency | 750Hz | 650Hz |
| Cabinet Material | Baltic birch plywood | Plywood |
| Rigging | Quick-lock rigging; 6 x M10 inserts; 35mm pole mount | M10 and quick-lock rigging; 35mm pole mount |
| Network Control | RDNet | - |
| DSP | Yes, FiRPHASE, Bass Motion Control, presets and RDNet | Yes, FiRPHASE and Bass Motion Control |
| Bluetooth | No | No |
| Weight | 62.6 lbs (28.4 kg) | 60.2 lbs (27.3 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 | No |
| Microphone Input | No | No |
| Guitar Input | No | No |
| Bass Extension (-3dB) | 54.5Hz (measured, manufacturer spinorama data) | 65Hz (measured, vendor Spinorama data) |
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 RCF NX 945-A (measured by the manufacturer), via spinorama.org.
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