Short answer: the AsciLab F6Bs. It ranks #20 of 222 bookshelf speakers by sound quality (rated 4.5/5); the Ascend Acoustics CBM-170 SE2 ranks #113 (rated 3.8/5).
The Ascend Acoustics CBM-170 SE2 is the more accurate, deeper-bass pick. Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms. Its measured preference score, a predictor of how neutral it sounds, is 6.30 against 5.24 for the AsciLab F6Bs. Its bass reaches about 70Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. Watch for: A narrow dip in the on-axis and listening-window response appears in the 3-5kHz range (down to about -2.7dB), mirrored by a matching dip in the directivity index at the same frequencies: likely a brief widening of dispersion right at the tweeter/woofer crossover.
The AsciLab F6Bs is the better-sounding choice. A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price. 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 Ascend Acoustics CBM-170 SE2.
Want more options? Browse the full Passive Home rankings.
Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms.
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
| Ascend Acoustics CBM-170 SE2 | AsciLab F6Bs | |
|---|---|---|
| Price | $468 per pair | €799 per pair |
| Ranked | #113 of 222 in Large Size Bookshelf Speakers | #20 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | 70Hz (measured, manufacturer spinorama data) | 82.0Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 50Hz (measured, manufacturer spinorama data) | 50.1Hz (measured, Audio Science Review) |
| Sensitivity | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Drivers | 27mm custom SEAS soft dome tweeter, 6.5” proprietary composite polygel cone woofer | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Dimensions | 12H x 9W x 9.5D in | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Weight | 15 lbs (6.8 kg) each | 12.3 lbs (5.6 kg) each |
| Impedance | 8 ohms | 4 ohms nominal, 3.7 ohms minimum |
| Power Handling | 200W continuous, 400W peak | - |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 6.30 | 5.24 |
| Spinorama Preference Score with Perfect Sub | 8.66 | 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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