Short answer: the Ascend Acoustics Sierra-LX. It ranks #37 of 222 bookshelf speakers by sound quality, rated 4.3/5, at $1,598. The ELAC Uni-Fi Reference UBR62 ranks #65, rated 4.1/5, at $1,299, $299 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Ascend Acoustics Sierra-LX is the more accurate, deeper-bass option. A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet. Its measured preference score, a predictor of how neutral it sounds, is 6.63 against 5.44 for the ELAC Uni-Fi Reference UBR62. Its bass reaches about 47Hz before falling 3dB, against 58.6Hz for the ELAC Uni-Fi Reference UBR62. Watch for: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
The case for 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 Ascend Acoustics Sierra-LX. It is rated higher for sound quality, and the $299 saving on the ELAC Uni-Fi Reference UBR62 is not enough to make up the difference.
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Specifications Side By Side
| Ascend Acoustics Sierra-LX | ELAC Uni-Fi Reference UBR62 | |
|---|---|---|
| Price | $1598 per pair | $1,299.00 per pair |
| Ranked | #37 of 222 in Large Size Bookshelf Speakers | #65 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 41.9Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | 58.6Hz (measured, Erin’s Audio Corner) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 14.1”H x 8.2”W x 13.1”D |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 4 ohms minimum near 50Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | 83dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | 1” tweeter coaxial with 4” midrange; 6.5” woofer |
| Weight | 20.9 lbs (9.5 kg) | 23.5 lbs (10.68 kg) each |
| Woofer Cabinet | Bass reflex, flared rear port | ported, dual front slot vents |
| Power Handling | 350W continuous, 500W peak | - |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | - |
| Country | USA | - |
| Spinorama Preference Score | 6.63 | 5.44 (measured, spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 8.44 | 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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