Short answer: the AsciLab C6B. It ranks #6 of 222 bookshelf speakers by sound quality (rated 4.7/5); the Mission LX-3 MKII ranks #138 (rated 3.6/5).
The AsciLab C6B is the more accurate, deeper-bass choice. Bookshelf speakers with very accurate sound and an unusually wide, stable soundstage, for any seating position. Its measured preference score, a predictor of how neutral it sounds, is 6.33 against 4.17 for the Mission LX-3 MKII. Its bass reaches about 54Hz before falling 3dB, against 67.4Hz for the Mission LX-3 MKII. The catch: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
What the Mission LX-3 MKII does well: Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity. The catch: On-axis smoothness of 0.217 and predicted in-room smoothness of 0.344 reveal clear response unevenness, with a -0.46dB-per-octave downward tilt.
Buy the AsciLab C6B. It is rated higher for sound quality than the Mission LX-3 MKII.
Still deciding? The full Passive Home rankings cover every ranked option.
Bookshelf speakers with very accurate sound and an unusually wide, stable soundstage, for any seating position.
Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity.
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Specifications Side By Side
| AsciLab C6B | Mission LX-3 MKII | |
|---|---|---|
| Price | $1145 per pair | £249 per pair |
| Ranked | #6 of 222 in Large Size Bookshelf Speakers | #138 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 42.5Hz (derived from ASR on-axis curve, spinorama.org) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 67.4Hz (measured, ASR via spinorama.org) |
| Dimensions | 15.7”H x 8”W x 10.4”D (398.8 x 203.2 x 264.2 mm) | 13.6H x 8.9W x 12.1D in |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal, 4.1 ohms minimum |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 88dB |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 1” microfiber-dome tweeter, 6.5” composite-fiber woofer |
| Weight | 18.5 lbs (8.4 kg) each | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | passive radiator | - |
| Spinorama Preference Score | 6.33 | 4.17 |
| Spinorama Preference Score with Perfect Sub | 8.28 | 6.42 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, bass-reflex |
| Country | - | United Kingdom (design) |
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