AsciLab C6B Specifications and Review

Last updated: August 14, 2026

The AsciLab C6B ranks #7 out of 84 total Large Size Bookshelf Speakers for sound quality. See Top Recommended Speakers By Attribute for all the top speaker suggestions.

AsciLab C6B - ranked #7 of 84 Large Size Bookshelf Speakers · Editor's rating 4.7/5
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#7 AsciLab C6B: $1145 Ascilab

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.

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.

How it compares: Just above it: March Audio Sointuva - $2850 more, 2.6Hz lower bass extension (-3dB). Just below it: Audio First Cadentia 3 - $6054 more, 0.8Hz higher bass extension (-3dB).

Bass Extension (-10dB)35Hz (measured, Erin's Audio Corner)
Bass Extension (-3dB)54Hz (measured, Erin's Audio Corner)
Dimensions15.7"H x 8"W x 10.4"D (398.8 x 203.2 x 264.2 mm)
Drivers6" Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1" Aluminium Ceramic Dome tweeter
Impedance4 ohms nominal, 2.6 ohms minimum (measured, Erin's Audio Corner)
Sensitivity85.6dB (measured, Erin's Audio Corner)
Weight18.5 lbs / 8.4 kg each
Woofer Cabinetpassive radiator
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