Short answer: the AsciLab C6B. It ranks #7 of 130 bookshelf speakers by sound quality at $1145; the ELAC Uni-Fi Reference UBR62 ranks #54 and costs $1199, which makes this an easy call rather than a real tradeoff.
What the AsciLab C6B offers: Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer, crossed over at 1.1kHz, plus a rear passive radiator. Unusual trait: horizontal radiation actually widens at higher frequencies instead of narrowing like most two-way designs, which keeps image focus and soundstage depth consistent whether you toe the speakers in or out (5-10° off-axis was the sweet spot in testing). Vertical radiation also stays wide straight through the 2kHz crossover region, so the sound doesn’t collapse when standing up - unusual at this price. CA2034 measurements show strong on-axis linearity, listening window, early reflections, and directivity. Midrange and tweeter distortion stay very low even at 96dB, holding up against a $5,900 Arendal speaker in that regard despite roughly a 5x price gap. At $935 (about $1,135 shipped to the US), the reviewer calls it the best-value bookshelf speaker he’s tested, rivaling speakers 2-5x the price. Watch for: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that. Low-frequency harmonic distortion increases substantially at 96dB versus 86dB, though it’s second-order and less audible than it looks on paper. Minimum impedance dips to 2.6 ohms (EPDR as low as 1.2 ohms), so it wants an amplifier comfortable driving 4-ohm loads, ideally 100W or more. At 102dB, compression noticeably eats into midrange, bass, and some treble output. Shipping to the US adds roughly $200 on top of the $935 price. Against the reviewer’s reference Audiofirst Fidelia at a similar price, has slightly less lower-midrange body (about 1dB difference) and a smaller perceived soundstage size.
What the ELAC Uni-Fi Reference UBR62 offers: True three-way stand-mount using a 1-inch tweeter concentrically mounted in a 4-inch aluminum midrange plus a dedicated 6.5-inch aluminum woofer. Erin found the directivity and overall tonality well controlled, with dual front slot vents minimizing placement sensitivity and cabinet bracing suppressing obvious coloration. The mostly 5-ohm-or-higher load is manageable for a genuinely 4-ohm-capable amplifier, and the coherent concentric upper range supports stable imaging across seats. Watch for: 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. Impedance reaches 4 ohms near 50Hz (Erin), while woofer excursion and bass output were less capable than expected for the cabinet size. A broad 500-700Hz rise and associated lower/female-vocal coloration were audible, and the slightly subdued listening-window treble is necessary to avoid an overly bright in-room balance rather than evidence of ruler-flat axial tuning.
Buy the AsciLab C6B. It ranks higher for sound quality than the ELAC Uni-Fi Reference UBR62 and costs less, which settles it without a real tradeoff to make.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| AsciLab C6B | ELAC Uni-Fi Reference UBR62 | |
|---|---|---|
| Price | $1145 per pair | $1,199 per pair |
| Ranked | #7 of 130 in Large Size Bookshelf Speakers | #54 of 130 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 | - |
| Woofer Cabinet | passive radiator | ported, dual front slot vents |
| Spinorama Preference Score | 5.66 | - |
| Spinorama Preference Score with Perfect Sub | 7.60 | - |
| Bass Extension | - | 41Hz manufacturer specified; Erin's response-linearity graph shows limited high-output bass headroom |
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The Two Speakers In Full
AsciLab C6B: $1145 per pair Ascilab eBay
Pros: Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer, crossed over at 1.1kHz, plus a rear passive radiator. Unusual trait: horizontal radiation actually widens at higher frequencies instead of narrowing like most two-way designs, which keeps image focus and soundstage depth consistent whether you toe the speakers in or out (5-10° off-axis was the sweet spot in testing). Vertical radiation also stays wide straight through the 2kHz crossover region, so the sound doesn’t collapse when standing up - unusual at this price. CA2034 measurements show strong on-axis linearity, listening window, early reflections, and directivity. Midrange and tweeter distortion stay very low even at 96dB, holding up against a $5,900 Arendal speaker in that regard despite roughly a 5x price gap. At $935 (about $1,135 shipped to the US), the reviewer calls it the best-value bookshelf speaker he’s tested, rivaling speakers 2-5x the price. Measured bass extension of 54Hz (-3dB), with a measured sensitivity of 85.6dB.
Cons: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that. Low-frequency harmonic distortion increases substantially at 96dB versus 86dB, though it’s second-order and less audible than it looks on paper. Minimum impedance dips to 2.6 ohms (EPDR as low as 1.2 ohms), so it wants an amplifier comfortable driving 4-ohm loads, ideally 100W or more. At 102dB, compression noticeably eats into midrange, bass, and some treble output. Shipping to the US adds roughly $200 on top of the $935 price. Against the reviewer’s reference Audiofirst Fidelia at a similar price, has slightly less lower-midrange body (about 1dB difference) and a smaller perceived soundstage size.
Full AsciLab C6B review and specifications →
| Bass Extension (-10dB) | 35Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 54Hz (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) |
| Drivers | 6" Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1" Aluminium Ceramic Dome tweeter |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 5.66 |
| Spinorama Preference Score with Perfect Sub | 7.60 |
| Weight | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | passive radiator |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
ELAC Uni-Fi Reference UBR62: $1,199 per pair Amazon eBay
Pros: True three-way stand-mount using a 1-inch tweeter concentrically mounted in a 4-inch aluminum midrange plus a dedicated 6.5-inch aluminum woofer. Erin found the directivity and overall tonality well controlled, with dual front slot vents minimizing placement sensitivity and cabinet bracing suppressing obvious coloration. The mostly 5-ohm-or-higher load is manageable for a genuinely 4-ohm-capable amplifier, and the coherent concentric upper range supports stable imaging across seats. Measured bass extension of 58.6Hz (-3dB), with a measured sensitivity of 83dB.
Cons: 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. Impedance reaches 4 ohms near 50Hz (Erin), while woofer excursion and bass output were less capable than expected for the cabinet size. A broad 500-700Hz rise and associated lower/female-vocal coloration were audible, and the slightly subdued listening-window treble is necessary to avoid an overly bright in-room balance rather than evidence of ruler-flat axial tuning.
Full ELAC Uni-Fi Reference UBR62 review and specifications →
| Bass Extension | 41Hz manufacturer specified; Erin's response-linearity graph shows limited high-output bass headroom |
|---|---|
| Bass Extension (-10dB) | 41.9Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 58.6Hz (measured, Erin's Audio Corner) |
| Dimensions | 14.1"H x 8.2"W x 13.1"D |
| Drivers | 1" tweeter coaxial with 4" midrange; 6.5" woofer |
| Impedance | 4 ohms minimum near 50Hz (measured, Erin's Audio Corner) |
| Sensitivity | 83dB/2.83V/1m (measured, Erin's Audio Corner) |
| Woofer Cabinet | ported, dual front slot vents |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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