Short answer: the AsciLab C6B. It ranks #6 of 203 bookshelf speakers by sound quality, rated 4.7/5, at $1,145. The Triangle Borea BR03 ranks #179, rated 2.8/5, at $395, $750 cheaper, not enough of a saving to outweigh the sound-quality gap.
The AsciLab C6B is the more accurate pick. 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. Its measured preference score, a predictor of how neutral it sounds, is 6.33 against 4.03 for the Triangle Borea BR03. The tradeoff: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
The case for the Triangle Borea BR03: Bass output is genuinely decent for the price: measured extension reaches F3 57Hz/F10 42Hz, which the reviewer had no real complaints about. The catch: A noticeable mid-range suckout, most pronounced in the upper mid-range/lower treble, that the reviewer attributes to cabinet resonances and driver breakup rather than a deliberate voicing choice: it makes vocals and instruments sound recessed and thin rather than warm.
Buy the AsciLab C6B. It is rated higher for sound quality, and saving $750 with the Triangle Borea BR03 does not make up for the sound-quality gap.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| AsciLab C6B | Triangle Borea BR03 | |
|---|---|---|
| Price | $1145 per pair | $395.00 per pair |
| Ranked | #6 of 203 in Large Size Bookshelf Speakers | #179 of 203 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 42Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 57Hz (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) | 14.96”H x 8.11”W x 12.36”D |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal (manufacturer spec), 4.2 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 87.5dB (measured at 2.83V/1m, Erin’s Audio Corner) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 6.5” natural cellulose midwoofer, 1” (25mm) EFS silk dome tweeter |
| Weight | 18.5 lbs (8.4 kg) each | 13.2 lbs (6 kg) each |
| Woofer Cabinet | passive radiator | ported, dual front ports |
| Spinorama Preference Score | 6.33 | 4.03 |
| Spinorama Preference Score with Perfect Sub | 8.28 | 6.38 |
| DIY Kit | No | No |
| Crossover Frequency | - | 3600Hz |
| Recommended Power | - | 100W |
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How AsciLab C6B compares with other leading options:
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- AsciLab C6B vs KEF Reference 1 Meta
- AsciLab C6B vs GR-Research NX-Studio
- AsciLab C6B vs March Audio Sointuva AWG
- AsciLab C6B vs Audio First Cadentia 3
Prices on this page were last checked October 7, 2026 at 9:25 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
AsciLab C6B: $1145 per pair Ascilab eBay
Same family: the AsciLab C5B (smaller bookshelf, rated 4.2/5).
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 $1145 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 AsciLab’s list 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) |
| DIY Kit | No |
| 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 | 6.33 |
| Spinorama Preference Score with Perfect Sub | 8.28 |
| Weight | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | passive radiator |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Triangle Borea BR03: $395.00 per pair Amazon eBay
Same family: the Triangle Borea BR02 (smaller bookshelf, estimated 2.7/5), the Triangle Borea BR07 (smallest floorstanding, estimated 3/5), the Triangle Borea BR08 (floorstanding, estimated 3.2/5), the Triangle Borea BR09 (largest floorstanding, estimated 3.3/5) and the Triangle Borea BRC01 (center, estimated 3.4/5).
Pros: Bass output is genuinely decent for the price: measured extension reaches F3 57Hz/F10 42Hz, which the reviewer had no real complaints about. Dual front-firing ports and a well-stuffed, well-braced cabinet. Solid build quality overall. Measured bass extension of 57Hz (-3dB), with a measured sensitivity of 87.5dB.
Cons: A noticeable mid-range suckout, most pronounced in the upper mid-range/lower treble, that the reviewer attributes to cabinet resonances and driver breakup rather than a deliberate voicing choice: it makes vocals and instruments sound recessed and thin rather than warm. Sibilance in the 4-8kHz region shows up on every track the reviewer tried. Measured minimum impedance dips to about 4.2 ohms (with an even lower EPDR), despite the speaker and its own rear panel being labeled 8 ohms: worth knowing if you’re planning to drive these with a receiver/AVR that assumes an 8-ohm nominal load. The reviewer is upfront that this speaker has a devoted following among other reviewers, but says he specifically doesn’t hear what they hear and wants people who own it to trust their own ears rather than assume something’s wrong with their hearing if they don’t love it either.
Full Triangle Borea BR03 review and specifications →
| Bass Extension (-10dB) | 42Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 57Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 3600Hz |
| DIY Kit | No |
| Dimensions | 14.96”H x 8.11”W x 12.36”D |
| Drivers | 6.5” natural cellulose midwoofer, 1” (25mm) EFS silk dome tweeter |
| Impedance | 8 ohms nominal (manufacturer spec), 4.2 ohms minimum (measured, Erin’s Audio Corner) |
| Recommended Power | 100W |
| Sensitivity | 87.5dB (measured at 2.83V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.03 |
| Spinorama Preference Score with Perfect Sub | 6.38 |
| Weight | 13.2 lbs (6 kg) each |
| Woofer Cabinet | ported, dual front ports |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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