Short answer: the Alcons Audio QRP20. It ranks #9 of 33 column and line array PA speakers by sound quality, rated 3.6/5, at $4,200; the L-Acoustics SOKA ranks #10, rated 3.5/5, and costs $5,400, which makes this an easy call rather than a real tradeoff.
The Alcons Audio QRP20 is the deeper-bass pick. A slim ribbon column with high output and a choice of wide horizontal coverage, built for discreet installs. Its bass reaches about 90Hz before falling 3dB, against 128Hz for the L-Acoustics SOKA. Watch for: Bass reaches only 90Hz at -3dB and about 81Hz at -10dB, so it needs a subwoofer for music.
The case for the L-Acoustics SOKA: An ultra-shallow passive column only about 10cm deep, with very wide coverage and high output that hides against a wall. The tradeoff: Bass reaches only about 128Hz (-3dB), so it needs a subwoofer or a bass companion, and it is passive, so it requires L-Acoustics amplified controllers.
Buy the Alcons Audio QRP20. It is rated higher for sound quality than the L-Acoustics SOKA and costs less, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete PA & Live Sound rankings.
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Specifications Side By Side
| Alcons Audio QRP20 | L-Acoustics SOKA | |
|---|---|---|
| Price | $4,200 Passive | $5,400 Passive |
| Ranked | #9 of 33 in Column and Line Array PA Speakers | #10 of 33 in Column and Line Array PA Speakers |
| Rigging | M10 inserts top and bottom; M6 bracket pattern on back | 6 x M6 inserts |
| Passive | Yes | Yes |
| Configuration | Passive 2-way point-source column (pro-ribbon) | Passive 2-way ultra-shallow line source |
| Drivers | 1x 4” RBN401 pro-ribbon driver, 4x 5” woofers (sealed) | 9x 3.5” neodymium cone drivers, 3x 1” neodymium compression drivers |
| Frequency Response | 72Hz - 20kHz (±3dB, manufacturer specified) | 70Hz - 20kHz (-10dB, manufacturer specified) |
| Dimensions | 29.2”H x 5.9”W x 5.9”D (742 x 150 x 150 mm) | 41.9”H x 3.9”W x 4.1”D (1065 x 99 x 104 mm) |
| Amplifier Power | Passive speaker; requires external amplification (Alcons Sentinel) | Passive speaker; requires external amplification (L-Acoustics amplified controller) |
| Maximum SPL | 128dB peak (manufacturer specified) | 133dB peak (manufacturer specified) |
| Coverage | 90° x 15° (120° version available) | 140° horizontal, +5°/-21° vertical |
| Sensitivity | 99dB (200Hz - 10kHz) | - |
| Impedance | 4 ohms | - |
| DSP | No (passive) | No (passive; processing comes from the amplified controller) |
| Weight | 26.5 lbs (12 kg) | 20.7 lbs (9.4 kg) |
| 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 |
| Bass Extension (-3dB) | 90Hz (measured, vendor Spinorama data) | 128Hz (measured, vendor Spinorama data) |
| Bass Extension (-10dB) | about 80.8Hz (measured, vendor Spinorama data) | - |
| Spinorama Preference Score | 3.38 | 3.21 |
| Spinorama Preference Score with Perfect Sub | 6.69 | 6.99 |
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