Short answer: the AsciLab F6Bs. It ranks #20 of 222 bookshelf speakers by sound quality (rated 4.5/5); the Ascend Acoustics CMT-340 SE2 ranks #24 (rated 4.4/5).
The case for the AsciLab F6Bs: A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price. The tradeoff: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio.
Why pick the Ascend Acoustics CMT-340 SE2: A dual woofer bookshelf speaker with accurate sound, high sensitivity, and lots of clean output, a superb partner for a subwoofer at a modest price. The tradeoff: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 5.33.
Buy the AsciLab F6Bs. It is rated higher for sound quality than the Ascend Acoustics CMT-340 SE2.
Want more options? Browse the full Passive Home rankings.
A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price.
A dual woofer bookshelf speaker with accurate sound, high sensitivity, and lots of clean output, a superb partner for a subwoofer at a modest 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
| AsciLab F6Bs | Ascend Acoustics CMT-340 SE2 | |
|---|---|---|
| Price | €799 per pair | $798 per pair |
| Ranked | #20 of 222 in Large Size Bookshelf Speakers | #24 of 222 in Large Size Bookshelf Speakers |
| Enclosure | sealed | - |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) | 21 x 7.5 x 10.5 in each |
| Weight | 12.3 lbs (5.6 kg) each | 29.1 lbs (13.2 kg) each |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) | 92dB at 2.83V/1m anechoic |
| Impedance | 4 ohms nominal, 3.7 ohms minimum | 8 ohms nominal |
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) | 77.6Hz (measured, spinorama.org) |
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) | approximately 53Hz (measured, spinorama.org) |
| 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 | 5.33 |
| Spinorama Preference Score with Perfect Sub | 7.90 | 7.99 |
| DIY Kit | No | No |
| Power Handling | - | 240W continuous; 400W short-term peak |
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