Short answer: the AsciLab F6Bs. It ranks #20 of 222 bookshelf speakers by sound quality (rated 4.5/5); the Dynaudio Special Forty ranks #148 (rated 3.5/5).
The Dynaudio Special Forty is the deeper-bass option. Premium bookshelf speakers with strong output, wide dispersion and fairly deep bass from a compact rear ported cabinet. Its bass reaches about 54Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. Watch for: A glaring, sometimes sibilant quality around 3-4kHz was the most noticeable issue in listening, the one thing the reviewer would want notched out with EQ.
The AsciLab F6Bs is the more accurate option. A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price. Its measured preference score, a predictor of how neutral it sounds, is 5.24 against 4.73 for the Dynaudio Special Forty. The catch: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio.
Buy the AsciLab F6Bs. It is rated higher for sound quality than the Dynaudio Special Forty.
Looking for alternatives? See the complete Passive Home rankings.
Premium bookshelf speakers with strong output, wide dispersion and fairly deep bass from a compact rear ported cabinet.
A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Dynaudio Special Forty | AsciLab F6Bs | |
|---|---|---|
| Price | $3600 per pair | €799 per pair |
| Ranked | #148 of 222 in Large Size Bookshelf Speakers | #20 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) | 50.1Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 82.0Hz (measured, Audio Science Review) |
| Dimensions | 14.1”H x 7.7”W x 12.1”D (358.1 x 195.6 x 307.3 mm) | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Impedance | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 4 ohms nominal, 3.7 ohms minimum |
| Sensitivity | 83.5dB (measured, Erin’s Audio Corner; 86dB manufacturer specified) | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Drivers | 5.9” MSP (Magnesium Silicate Polymer) cone woofer, 1” Esotar soft dome tweeter | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Weight | 17.9 lbs (8.1 kg) each | 12.3 lbs (5.6 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 4.73 | 5.24 |
| Spinorama Preference Score with Perfect Sub | 6.74 | 7.90 |
| DIY Kit | No | No |
| Enclosure | - | sealed |
| Crossover Frequency | - | 1kHz |
| Mounting | - | VESA 100 wall mount compatible |
| Warranty | - | 2 years |
| Country | - | South Korea |
| Maximum SPL | - | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) |
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