Short answer: the AsciLab C6B. It ranks #6 of 222 bookshelf speakers by sound quality, rated 4.7/5, at $1,145; the ELAC Uni-Fi Reference UBR62 ranks #65, rated 4.1/5, and costs $1,299, which makes this an easy call rather than a real tradeoff.
The AsciLab C6B is the more accurate 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 5.44 for the ELAC Uni-Fi Reference UBR62. The catch: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
Why pick the ELAC Uni-Fi Reference UBR62: A three way bookshelf speaker with a coaxial tweeter and midrange for stable imaging, well controlled tonality, and front ports for easy placement. The catch: Erin measured very low 83dB/2.83V/1m sensitivity; his 110W Parasound was insufficient for the high-level test and the more powerful HINT 6 was needed.
Buy the AsciLab C6B. It is rated higher for sound quality than the ELAC Uni-Fi Reference UBR62 and costs less, so only choose the other one for a particular feature it does better.
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.
A three way bookshelf speaker with a coaxial tweeter and midrange for stable imaging, well controlled tonality, and front ports for easy placement.
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Specifications Side By Side
| AsciLab C6B | ELAC Uni-Fi Reference UBR62 | |
|---|---|---|
| Price | $1145 per pair | $1,299.00 per pair |
| Ranked | #6 of 222 in Large Size Bookshelf Speakers | #65 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 41.9Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 58.6Hz (measured, Erin’s Audio Corner) |
| Dimensions | 15.7”H x 8”W x 10.4”D (398.8 x 203.2 x 264.2 mm) | 14.1”H x 8.2”W x 13.1”D |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms minimum near 50Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 83dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 1” tweeter coaxial with 4” midrange; 6.5” woofer |
| Weight | 18.5 lbs (8.4 kg) each | 23.5 lbs (10.68 kg) each |
| Woofer Cabinet | passive radiator | ported, dual front slot vents |
| Spinorama Preference Score | 6.33 | 5.44 (measured, spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 8.28 | 7.7 (measured, spinorama.org) |
| DIY Kit | No | No |
| Bass Extension | - | 41Hz manufacturer specified; Erin’s response-linearity graph shows limited high-output bass headroom |
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