Short answer: the AsciLab C6B. It ranks #6 of 222 bookshelf speakers by sound quality, rated 4.7/5, at $1,145; the SVS Ultra Evolution Bookshelf ranks #78, rated 4.0/5, and costs $1,199, so there is not much of a tradeoff to weigh.
What the SVS Ultra Evolution Bookshelf does well: A two way bookshelf speaker with a diamond coated tweeter and deep rated bass for its size, easy to drive with most amps. The catch: Measured by Stereophile and Audioholics, but not in the Spinorama format used for this ranking, so its tonal balance and directivity can’t yet be compared directly with ranked speakers.
The AsciLab C6B is the better-sounding pick. Bookshelf speakers with very accurate sound and an unusually wide, stable soundstage, for any seating position. The tradeoff: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
Buy the AsciLab C6B. It is rated higher for sound quality than the SVS Ultra Evolution Bookshelf and costs less, so only choose the other one for a particular feature it does better.
Worth knowing: the SVS Ultra Evolution Bookshelf has not been measured yet. Its rating is estimated from related models, with a likely range of 3.8 to 4.2, so treat this verdict as provisional.
Looking for alternatives? See the complete Passive Home rankings.
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Specifications Side By Side
| SVS Ultra Evolution Bookshelf | AsciLab C6B | |
|---|---|---|
| Price | $1,199.00 per pair | $1145 per pair |
| Ranked | #78 of 222 in Large Size Bookshelf Speakers Estimated | #6 of 222 in Large Size Bookshelf Speakers |
| Drivers | 6.5” composite glass fiber cone woofer, 1” diamond-coated aluminum dome tweeter | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter |
| Frequency Response | 40Hz-40kHz ±3dB (manufacturer specified) | - |
| Sensitivity | 87dB (2.83V/1m, manufacturer specified) | 85.6dB (measured, Erin’s Audio Corner) |
| Impedance | 6 ohms nominal (manufacturer specified) | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) |
| Woofer Cabinet | ported, rear | passive radiator |
| Dimensions | 14.9”H x 8.7”W x 11.3”D (378 x 220 x 286 mm) | 15.7”H x 8”W x 10.4”D (398.8 x 203.2 x 264.2 mm) |
| Weight | 19 lbs (8.6 kg) each | 18.5 lbs (8.4 kg) each |
| Cabinet Color | piano gloss black, piano gloss white, black oak | - |
| Country | United States | - |
| Bass Extension (-10dB) | - | 35Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | - | 54Hz (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | - | 6.33 |
| Spinorama Preference Score with Perfect Sub | - | 8.28 |
| DIY Kit | - | No |
Where the Ratings Come From
- SVS Ultra Evolution Bookshelf: reviews by Stereophile and Audioholics.
- AsciLab C6B: Spinorama.org measurements and reviews by Erin’s Audio Corner.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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