Short answer: the Alcons Audio QR24. It ranks #6 of 13 line array and installation pa speakers by sound quality (rated 4.0/5); the Alcons Audio QRP40 ranks #7 (rated 3.7/5).
Why pick the Alcons Audio QR24: High-quality manufacturer measurements give preference scores of 4.38 standalone and 7.25 with an ideal subwoofer, with a tight 1.4dB reference band and 0.279 listening-window deviation. The catch: Bass drops quickly below about 70Hz, so a subwoofer is needed for full-range music.
What the Alcons Audio QRP40 does well: High-quality manufacturer measurements give preference scores of 3.80 standalone and 6.67 with an ideal subwoofer. The catch: A 4.22 directivity-index deviation means off-axis tone varies more than its QR24 sibling, and it needs a subwoofer below about 70Hz.
Buy the Alcons Audio QR24. It is rated higher for sound quality than the Alcons Audio QRP40.
Still deciding? The full PA & Live Sound rankings cover every ranked option.
Specifications Side By Side
| Alcons Audio QR24 | Alcons Audio QRP40 | |
|---|---|---|
| Price | - | - |
| Ranked | #6 of 13 in Line Array and Installation PA Speakers | #7 of 13 in Line Array and Installation PA Speakers |
| Configuration | Passive 2-way modular column (pro-ribbon) | Passive 2-way point-source column (pro-ribbon) |
| Drivers | 2x 12” RBN1203 pro-ribbon drivers, 4x 6.5” neodymium woofers (vented) | 1x 12” RBN1203 pro-ribbon driver, 8x 5” woofers (sealed) |
| Frequency Response | 74Hz - 20kHz (±3dB, manufacturer specified) | 71Hz - 20kHz (±3dB, manufacturer specified) |
| Dimensions | 25.9”H x 9.8”W x 13.2”D (658 x 248 x 336 mm) | 44”H x 6.3”W x 9.3”D (1118 x 161 x 236 mm) |
| Amplifier Power | Passive speaker; requires external amplification (Alcons Sentinel) | Passive speaker; requires external amplification (Alcons Sentinel) |
| Maximum SPL | 135dB peak (manufacturer specified) | 131dB peak (manufacturer specified) |
| Coverage | 80° or 110° horizontal x 3.6° per module | 90° x 20° (120° version available) |
| Sensitivity | 109dB (200Hz - 10kHz) | 103dB (200Hz - 10kHz) |
| Impedance | 8 ohms | 4 ohms |
| DSP | No (passive) | No (passive) |
| Weight | 48.5 lbs (22 kg) | 48.5 lbs (22 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) | 71Hz (measured, vendor Spinorama data) | 73Hz (measured, vendor Spinorama data) |
| Bass Extension (-10dB) | about 62.5Hz (measured, vendor Spinorama data) | about 63.8Hz (measured, vendor Spinorama data) |
| Spinorama Preference Score | 4.38 | 3.80 |
| Spinorama Preference Score with Perfect Sub | 7.25 | 6.67 |
Related Speaker Comparisons
How Alcons Audio QR24 compares with other leading options:
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- JBL CBT 1000 + CBT 1000E vs Alcons Audio QR24
- JBL CBT 1000 vs Alcons Audio QR24
- Kling Freitag PIA M vs Alcons Audio QR24
- L-Acoustics SYVA vs Alcons Audio QR24
Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Alcons Audio QR24 Passive eBay
Pros: High-quality manufacturer measurements give preference scores of 4.38 standalone and 7.25 with an ideal subwoofer, with a tight 1.4dB reference band and 0.279 listening-window deviation. Two 12-inch pro-ribbon drivers above four 6.5-inch woofers give 109dB sensitivity and a 135dB peak, and bass reaches 71Hz at -3dB. It works alone or stacked with more modules as a vertical array, in 80° or 110° horizontal versions. Measured bass extension of 71Hz (-3dB).
Cons: Bass drops quickly below about 70Hz, so a subwoofer is needed for full-range music. It needs Alcons Sentinel amplification for its presets, weighs 22kg, and is sold only through pro dealers with no published price.
Full Alcons Audio QR24 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | Passive speaker; requires external amplification (Alcons Sentinel) |
| Aux Input | No |
| Bass Extension (-10dB) | about 62.5Hz (measured, vendor Spinorama data) |
| Bass Extension (-3dB) | 71Hz (measured, vendor Spinorama data) |
| Bluetooth | No |
| Coaxial Input | No |
| Configuration | Passive 2-way modular column (pro-ribbon) |
| Coverage | 80° or 110° horizontal x 3.6° per module |
| DSP | No (passive) |
| Dimensions | 25.9”H x 9.8”W x 13.2”D (658 x 248 x 336 mm) |
| Drivers | 2x 12” RBN1203 pro-ribbon drivers, 4x 6.5” neodymium woofers (vented) |
| Frequency Response | 74Hz - 20kHz (±3dB, manufacturer specified) |
| Guitar Input | No |
| HDMI Input | No |
| Impedance | 8 ohms |
| Maximum SPL | 135dB peak (manufacturer specified) |
| Microphone Input | No |
| Optical Input | No |
| RCA Input | No |
| Sensitivity | 109dB (200Hz - 10kHz) |
| Spinorama Preference Score | 4.38 |
| Spinorama Preference Score with Perfect Sub | 7.25 |
| TRS Input | No |
| USB Input | No |
| Weight | 48.5 lbs (22 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Alcons Audio QRP40 Passive eBay
Pros: High-quality manufacturer measurements give preference scores of 3.80 standalone and 6.67 with an ideal subwoofer. A 12-inch pro-ribbon driver sits coaxially within eight sealed 5-inch woofers, giving 103dB sensitivity and a 131dB peak with 90° or 120° horizontal coverage. Bass reaches 73Hz at -3dB, and the shallow 236mm cabinet is easy to hide on a wall. Measured bass extension of 73Hz (-3dB).
Cons: A 4.22 directivity-index deviation means off-axis tone varies more than its QR24 sibling, and it needs a subwoofer below about 70Hz. It needs Alcons Sentinel amplification and is sold only through pro dealers with no published price.
Full Alcons Audio QRP40 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | Passive speaker; requires external amplification (Alcons Sentinel) |
| Aux Input | No |
| Bass Extension (-10dB) | about 63.8Hz (measured, vendor Spinorama data) |
| Bass Extension (-3dB) | 73Hz (measured, vendor Spinorama data) |
| Bluetooth | No |
| Coaxial Input | No |
| Configuration | Passive 2-way point-source column (pro-ribbon) |
| Coverage | 90° x 20° (120° version available) |
| DSP | No (passive) |
| Dimensions | 44”H x 6.3”W x 9.3”D (1118 x 161 x 236 mm) |
| Drivers | 1x 12” RBN1203 pro-ribbon driver, 8x 5” woofers (sealed) |
| Frequency Response | 71Hz - 20kHz (±3dB, manufacturer specified) |
| Guitar Input | No |
| HDMI Input | No |
| Impedance | 4 ohms |
| Maximum SPL | 131dB peak (manufacturer specified) |
| Microphone Input | No |
| Optical Input | No |
| RCA Input | No |
| Sensitivity | 103dB (200Hz - 10kHz) |
| Spinorama Preference Score | 3.80 |
| Spinorama Preference Score with Perfect Sub | 6.67 |
| TRS Input | No |
| USB Input | No |
| Weight | 48.5 lbs (22 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons