Short answer: the LINEAR 7 115 FA for most buyers, the KX 45-A only if you need RCF’s flagship output ceiling and RDNet control. These rank #5 and #7 out of 76 15-inch powered PA speakers, priced at $4,618.50 and $1,999.
The KX 45-A is RCF’s flagship 15-inch point source. A 3200W amplifier pairs with a 3-inch titanium-dome compression driver, RDNet remote control and a 137dB claimed peak, the highest maximum-output claim in this ranking, with rotatable 100° x 70° coverage suiting both main and monitor use. Its own cons note the local measurement is truncated and can’t produce a preference score, and at 62.6 lbs (28.4 kg) it’s one of the heaviest boxes here, with pricing and retail availability not yet fully established.
The LINEAR 7 115 FA is lighter and comes with a confirmed measured result. High-quality vendor data returns a 6.03 ideal-subwoofer preference score with 60Hz measured extension, and MILAN/AVB networking, a 10-band parametric EQ and a rotatable constant-directivity horn make it a systems-oriented choice for professional deployment. Its own cons note at 70.5 lbs (32 kg) it’s still a heavy 15-inch cabinet, and buyers who don’t need networked audio may find comparable performance in simpler mainstream models, while its 60° x 40° pattern is narrower than several rivals including the KX 45-A’s 100° x 70°.
Buy the LINEAR 7 115 FA for a confirmed measured preference score and MILAN networking at a lower price.
Buy the KX 45-A if you specifically need RCF’s higher output ceiling, RDNet control and wider rotatable coverage for main or monitor duty.
Looking for alternatives? See the complete PA & Live Sound rankings.
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, network audio, detailed EQ and a rotatable horn for professional systems.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| RCF KX 45-A | HK Audio LINEAR 7 115 FA | |
|---|---|---|
| Price | $4,618.50 | $1,999.00 |
| Ranked | #5 of 76 in 15-Inch PA Speakers | #7 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” compression driver |
| Frequency Response | 50Hz - 20kHz (manufacturer specified) | 57Hz - 19kHz (±3dB, manufacturer specified); 54Hz - 20kHz (-10dB) |
| Dimensions | 27.8”H x 16.5”W x 16.9”D (705 x 419.6 x 430 mm) | 28”H x 17.7”W x 17.7”D (710 x 450 x 450 mm) |
| Coverage | 100° x 70°, rotatable | 60° x 40°, rotatable |
| Maximum SPL | 137dB peak (manufacturer specified) | 134dB peak (manufacturer specified) |
| Inputs | XLR audio input/link and EtherCON RDNet | XLR/jack combo input, XLR thru and XLR DSP output |
| Amplifier Power | 3200W peak (2000W LF + 1200W HF) | 2,000W peak (Class D bi-amped, manufacturer specified) |
| Crossover Frequency | 750Hz | 1.5kHz FIR (manufacturer specified) |
| Cabinet Material | Baltic birch plywood | Hybrid birch multiplex/MDF |
| Rigging | Quick-lock rigging; 6 x M10 inserts; 35mm pole mount | Four M8 points; DuoTilt 3°/7° pole mount |
| Network Control | RDNet | EtherCON input/thru; DSP CONTROL software |
| DSP | Yes, FiRPHASE, Bass Motion Control, presets and RDNet | Yes, networked 10-band PEQ, filters, delay and limiter |
| Bluetooth | No | No |
| Weight | 62.6 lbs (28.4 kg) | 70.5 lbs (32 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) | 60Hz (measured, vendor Spinorama data) |
| Spinorama Preference Score | - | 3.43 |
| Spinorama Preference Score with Perfect Sub | - | 6.03 |
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 HK Audio LINEAR 7 115 FA (measured by the manufacturer), via spinorama.org.
Related Speaker Comparisons
How RCF KX 45-A compares with other leading options: