Short answer: the AsciLab F6Bs. It ranks #20 of 141 bookshelf speakers by sound quality (rated 4.5/5) and is still sold new; the KEF Q350 ranks #115 (rated 3.0/5) and is discontinued, so it is only an option used.
The AsciLab F6Bs is the better-sounding choice. A slimmer, sealed, VESA 100 wall mountable variant of AsciLab’s F6B, trading the F6B’s passive radiator for a shallower 15.4cm deep cabinet that can go straight on a wall bracket. The catch: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio.
The KEF Q350 is the deeper-bass option. CEA2034 spinorama shows a reasonably flat on-axis response with excellent directivity, aided by the coaxial Uni-Q driver. Its bass reaches about 70Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. Watch for: Two resonances at 700Hz and 1.2kHz show up on-axis, alongside an upper-bass boost.
Buy the AsciLab F6Bs. It is rated higher for sound quality, and the KEF Q350 is discontinued, so it is only available used.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| AsciLab F6Bs | KEF Q350 | |
|---|---|---|
| Price | €799 per pair | $699.00 per pair Discontinued |
| Ranked | #20 of 141 in Large Size Bookshelf Speakers | #115 of 141 in Large Size Bookshelf Speakers |
| Enclosure | sealed | - |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer | 25mm tweeter + 165mm woofer |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) |
| Weight | 12.3 lbs (5.6 kg) each | 29.5 lbs (13.4 kg) |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) | 86dB (measured, Audio Science Review) |
| Impedance | 4 ohms nominal, 3.7 ohms minimum | 4 ohms |
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) | 70Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) | 38Hz (measured, Audio Science Review) |
| 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) | - |
| Spinorama Preference Score | 5.24 | 5.25 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.90 | 7.12 (spinorama.org) |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
Related Speaker Comparisons
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- AsciLab F6Bs vs KEF Reference 1 Meta
- AsciLab F6Bs vs GR-Research NX-Studio
- AsciLab C6B vs AsciLab F6Bs
- Audio First Cadentia 3 vs AsciLab F6Bs
Prices on this page were last checked October 4, 2026 at 9:58 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
AsciLab F6Bs: €799 per pair Audiophonics eBay
Pros: A slimmer, sealed, VESA 100 wall mountable variant of AsciLab’s F6B, trading the F6B’s passive radiator for a shallower 15.4cm deep cabinet that can go straight on a wall bracket. Off axis sound tracks the on axis response unusually consistently for a sealed 2-way this size, and on axis deviation measures a clean 0.25dB average. Measured bass extension of 82.0Hz (-3dB), with a measured sensitivity of 85.2dB.
Cons: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio. Bass extension is measured at 82.0Hz at -3dB, noticeably less than the passive radiator equipped F6B, and listening window smoothness measures only a moderate 0.39. The 4 ohm nominal impedance calls for a reasonably capable amplifier.
Full AsciLab F6Bs review and specifications →
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) |
| Country | South Korea |
| Crossover Frequency | 1kHz |
| DIY Kit | No |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Enclosure | sealed |
| Impedance | 4 ohms nominal, 3.7 ohms minimum |
| Maximum SPL | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) |
| Mounting | VESA 100 wall mount compatible |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Spinorama Preference Score | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.90 |
| Warranty | 2 years |
| Weight | 12.3 lbs (5.6 kg) each |
- Links
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KEF Q350: $699.00 per pair Discontinued Amazon eBay
Newer model: the KEF Q3 Meta, ranked higher, rated 3.4/5.
Smaller model: the KEF Q150 (rated 3.7/5).
Pros: CEA2034 spinorama shows a reasonably flat on-axis response with excellent directivity, aided by the coaxial Uni-Q driver. Vertical directivity is better than most non-coaxial two-way speakers, another benefit of the concentric design. Measured bass extension of 70Hz (-3dB), with a measured sensitivity of 86dB.
Cons: Two resonances at 700Hz and 1.2kHz show up on-axis, alongside an upper-bass boost. Predicted in-room response looks a bit boomy as a result. Distortion climbs substantially in the 100Hz-1kHz range at 96dB SPL/1m, with a distinct resonance-driven peak around 900Hz-1kHz at both test levels. Discontinued.
Full KEF Q350 review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 70Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) |
| Drivers | 25mm tweeter + 165mm woofer |
| Impedance | 4 ohms |
| Sensitivity | 86dB (measured, Audio Science Review) |
| Spinorama Preference Score | 5.25 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.12 (spinorama.org) |
| Weight | 29.5 lbs (13.4 kg) |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons