Short answer: these RCF KX 45-A and RCF ART 735-A MK4 alternatives share a brand and size class, but their coverage, driver architecture, cabinet format, processing, and output priorities can make them fit very different jobs. The RCF ART 735-A MK4 is discontinued; its replacement is the RCF ART 735-A MK5.
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 RCF ART 735-A MK4. Its large 3-inch compression-driver voice coil, 132dB claimed peak and roughly 53Hz measured extension give it useful vocal headroom and bass reach. The 47.2 lbs (21.4 kg) enclosure remains manageable for a 15-inch box.
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. The low-quality vendor data is truncated and does not yield a preference score. It is discontinued and eclipsed by current 9-series and MK5 models.
Buy the RCF KX 45-A when its stated coverage, output, processing, and deployment format best match the job.
Buy the RCF ART 735-A MK4 when its stated strengths are the better match for the room and the rest of the PA.
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 discontinued powered 15 inch PA speaker with strong vocal headroom and decent bass reach in a manageable cabinet.
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 ART 735-A MK4 | |
|---|---|---|
| Price | $4,618.50 | $888.00 Discontinued |
| Ranked | #5 of 76 in 15-Inch PA Speakers | #51 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, 1.4” compression driver with 3” voice coil |
| 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) | 27.9”H x 17.2”W x 15.3”D (708 x 437 x 389 mm) |
| Coverage | 100° x 70°, rotatable | 100° x 60° |
| Maximum SPL | 137dB peak (manufacturer specified) | 132dB peak (manufacturer specified) |
| Inputs | XLR audio input/link and EtherCON RDNet | XLR/jack combo input; XLR output |
| Amplifier Power | 3200W peak (2000W LF + 1200W HF) | 1,400W peak / 700W RMS (1,000W LF + 400W HF peak, manufacturer specified) |
| Crossover Frequency | 750Hz | 800Hz (manufacturer specified) |
| Cabinet Material | Baltic birch plywood | Polypropylene composite |
| Rigging | Quick-lock rigging; 6 x M10 inserts; 35mm pole mount | Two M10 fly points; pole mount |
| Network Control | RDNet | - |
| DSP | Yes, FiRPHASE, Bass Motion Control, presets and RDNet | Yes, FiRPHASE, EQ, limiting and protection |
| Bluetooth | No | No |
| Weight | 62.6 lbs (28.4 kg) | 47.2 lbs (21.4 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) | 53Hz (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 ART 735-A MK4 (measured by the manufacturer), via spinorama.org.
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