Short answer: the L-Acoustics SYVA-low+top if sound quality matters most, the Alcons Audio QR24 if price matters most. The L-Acoustics SYVA-low+top ranks #1 of 33 column and line array PA speakers, rated 4.4/5, at $19,000. The Alcons Audio QR24 ranks #6, rated 4.0/5, at $7,200, $11,800 cheaper.
The L-Acoustics SYVA-low+top is the more accurate, deeper-bass choice. A slim column system with extremely accurate installed PA sound, wide coverage, and bass deep enough for full range music. Its measured preference score, a predictor of how neutral it sounds, is 6.05 against 4.38 for the Alcons Audio QR24. Its bass reaches about 50Hz before falling 3dB, against 71Hz for the Alcons Audio QR24. The tradeoff: A passive system that needs L-Acoustics amplified controllers (LA4X, LA12X or LA8).
The case for the Alcons Audio QR24: A ribbon column module with accurate, even sound and very high output that works alone or stacked as an array. The tradeoff: Bass drops quickly below about 70Hz, so a subwoofer is needed for full-range music.
Buy the L-Acoustics SYVA-low+top if sound quality matters more than the price. Buy the Alcons Audio QR24 if the price matters more than sound quality.
Want more options? Browse the full PA & Live Sound rankings.
Prices on this page were last checked November 7, 2026 at 7:34 PM 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
| L-Acoustics SYVA-low+top | Alcons Audio QR24 | |
|---|---|---|
| Price | $19,000 Passive | $7,200 Passive |
| Ranked | #1 of 33 in Column and Line Array PA Speakers | #6 of 33 in Column and Line Array PA Speakers |
| Passive | Yes | Yes |
| Configuration | Passive 2-way line source with dual 12” low extension (SYVA plus SYVA Low) | Passive 2-way modular column (pro-ribbon) |
| Drivers | 6x 5” cone drivers and 3x 1.75” compression drivers (SYVA), dual 12” cone drivers (SYVA Low) | 2x 12” RBN1203 pro-ribbon drivers, 4x 6.5” neodymium woofers (vented) |
| Frequency Response | 40Hz - 20kHz (manufacturer specified) | 74Hz - 20kHz (±3dB, manufacturer specified) |
| Dimensions | 84.6”H x 13.1”W x 13.8”D (2150 x 334 x 350 mm) (measured stack) | 25.9”H x 9.8”W x 13.2”D (658 x 248 x 336 mm) |
| Inputs | Speakon (via L-Acoustics amplified controller) | - |
| Amplifier Power | Passive speaker; requires an L-Acoustics amplified controller (LA4X, LA12X or LA8) | Passive speaker; requires external amplification (Alcons Sentinel) |
| Cabinet Material | Baltic beech and birch plywood | - |
| Bass Extension (-3dB) | 50Hz (measured, vendor Spinorama data) | 71Hz (measured, vendor Spinorama data) |
| Coverage | 140° horizontal, about 25° vertical | 80° or 110° horizontal x 3.6° per module |
| Maximum SPL | 137dB (manufacturer specified) | 135dB peak (manufacturer specified) |
| DSP | No (passive; processing and protection come from the amplified controller) | No (passive) |
| Weight | 110.2 lbs (50 kg) | 48.5 lbs (22 kg) |
| Spinorama Preference Score | 6.05 | 4.38 |
| Spinorama Preference Score with Perfect Sub | 8.11 | 7.25 |
| Bluetooth | No | No |
| XLR Input | No | No |
| RCA Input | No | No |
| TRS Input | No | No |
| 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 |
| Sensitivity | - | 109dB (200Hz - 10kHz) |
| Impedance | - | 8 ohms |
| Bass Extension (-10dB) | - | about 62.5Hz (measured, vendor Spinorama data) |
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