These are not really the same size class, and that is the honest framing here. The Q Acoustics 5040 ranks #77 of 139 floorstanding speakers by sound quality at $2,472.98; the Q Acoustics 5090 ranks #47 of 98 center channel speakers by sound quality at $799.
Why pick the Q Acoustics 5040: C3 (Continuous Curved Cone) driver profile technology provides smooth midrange integration, controlled cone breakup, and improved bass damping. Watch for: Free-field frequency response exhibits a noticeable mid-bass scoop around 200Hz (~6dB lower than mean SPL), causing an F3 of 70Hz (F10 of 39Hz) in open space and requiring boundary placement (11-22 inches from front wall) to reinforce upper bass output.
The case for the Q Acoustics 5090: Dual 4.5-inch C3 Continuous Curved Cone woofers paired with high-performance Point-2-Point internal bracing. The catch: Impedance drops to 3.2 ohms minimum at bass frequencies.
Buy the Q Acoustics 5040 at $2,472.98 if you want a floorstanding speaker. Buy the Q Acoustics 5090 at $799 if you want a center channel speaker instead.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Q Acoustics 5040 | Q Acoustics 5090 | |
|---|---|---|
| Price | $2,472.98 per pair | $799.00 |
| Ranked | #77 of 139 in Large Size Floorstanding Speakers | #47 of 98 in Center Channel Speakers |
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | - |
| Dimensions | 38.1”H x 11.5”W x 14.2”D (967 x 293 x 361 mm) | 6.5”H x 16.9”W x 9.6”D (164 x 430 x 243 mm) |
| Impedance | 6 ohms nominal (3.0 ohms minimum, measured by Erin’s Audio Corner) | 6 ohms nominal (3.2 ohms minimum) |
| Sensitivity | 91.5dB (measured average, Erin’s Audio Corner) | 90.5dB (2.83V/1m) |
| Drivers | 0.88 in. decoupled dome tweeter, twin 5.0 in. C3 Continuous Curved Cone woofers | 1” (25mm) decoupled dome tweeter, 2 x 4.5” (110mm) C3 cone woofers |
| Weight | 39.7 lbs (18.0 kg) each | 18.7 lbs (8.5 kg) |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 3.80 | - |
| Spinorama Preference Score with Perfect Sub | 6.41 | - |
| DIY Kit | No | No |
| Frequency Response | - | 57Hz - 30kHz (-6dB) |
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Prices on this page were last checked October 5, 2026 at 10:21 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
Q Acoustics 5040: $2,472.98 per pair Amazon eBay
Smaller models: the Q Acoustics 5020 (rated 2.2/5) and the Q Acoustics 5010 (estimated 3.5/5).
Larger model: the Q Acoustics 5050 (ranked higher, estimated 4.3/5).
Pros: C3 (Continuous Curved Cone) driver profile technology provides smooth midrange integration, controlled cone breakup, and improved bass damping. High voltage sensitivity (91.5dB SPL at 2.83V/1m) allows loud listening with low-to-moderate amplifier wattage. Cabinet features Point-to-Point (P2P) internal bracing and Helmholtz Pressure Equalizer (HPE) tubes to suppress internal standing waves and panel vibrations. Measured bass extension of 70Hz (-3dB), with a measured sensitivity of 91.5dB.
Cons: Free-field frequency response exhibits a noticeable mid-bass scoop around 200Hz (~6dB lower than mean SPL), causing an F3 of 70Hz (F10 of 39Hz) in open space and requiring boundary placement (11-22 inches from front wall) to reinforce upper bass output. Measurements indicate an enclosure resonance near 300Hz visible in sound power data. Minimum impedance drops to 3.0 ohms, demanding a stable 4-ohm rated amplifier despite high sensitivity.
Full Q Acoustics 5040 review and specifications →
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 38.1”H x 11.5”W x 14.2”D (967 x 293 x 361 mm) |
| Drivers | 0.88 in. decoupled dome tweeter, twin 5.0 in. C3 Continuous Curved Cone woofers |
| Impedance | 6 ohms nominal (3.0 ohms minimum, measured by Erin’s Audio Corner) |
| Sensitivity | 91.5dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 3.80 |
| Spinorama Preference Score with Perfect Sub | 6.41 |
| Weight | 39.7 lbs (18.0 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
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Q Acoustics 5090: $799.00 Estimated Amazon eBay
Pros: Dual 4.5-inch C3 Continuous Curved Cone woofers paired with high-performance Point-2-Point internal bracing. High 90.5dB sensitivity, low distortion, and deeper bass down to 57Hz.
Cons: Impedance drops to 3.2 ohms minimum at bass frequencies. 2-way horizontal geometry exhibits narrow off-axis sweet spot. Rating estimated based on 5020 and 5040 measurements.
Full Q Acoustics 5090 review and specifications →
| DIY Kit | No |
|---|---|
| Dimensions | 6.5”H x 16.9”W x 9.6”D (164 x 430 x 243 mm) |
| Drivers | 1” (25mm) decoupled dome tweeter, 2 x 4.5” (110mm) C3 cone woofers |
| Frequency Response | 57Hz - 30kHz (-6dB) |
| Impedance | 6 ohms nominal (3.2 ohms minimum) |
| Sensitivity | 90.5dB (2.83V/1m) |
| Weight | 18.7 lbs (8.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons