Short answer: the AsciLab C6B. It ranks #6 of 216 bookshelf speakers by sound quality, rated 4.7/5, at $1,145; the Yamaha NS-800A ranks #81, rated 4.0/5, and costs $4,999.90, so there is not much of a tradeoff to weigh.
The AsciLab C6B is the more accurate, deeper-bass option. 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 4.66 for the Yamaha NS-800A. Its bass reaches about 54Hz before falling 3dB, against 68Hz for the Yamaha NS-800A. Watch for: 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 Yamaha NS-800A: Exceptionally well-built cabinet with no internal resonance issues at all: confirmed clean in both burst decay and impedance measurements. Watch for: A wide, roughly 2kHz-10kHz scoop in the upper-midrange/lower-treble gives it a laidback, soft, low-attack character: notably worse than the reviewer’s Audio First Fidelia reference in an A/B comparison.
Buy the AsciLab C6B. It is rated higher for sound quality than the Yamaha NS-800A and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| AsciLab C6B | Yamaha NS-800A | |
|---|---|---|
| Price | $1145 per pair | $4,999.90 per pair |
| Ranked | #6 of 216 in Large Size Bookshelf Speakers | #81 of 216 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 35Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 68Hz (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) | 16.5”H x 9.1”W x 14.1”D (419.1 x 231.8 x 358.8 mm) |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms nominal, 4.3 ohms minimum (measured above 80Hz, Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 84.9dB (measured average 300Hz-3kHz @ 2.83V/1m, Erin’s Audio Corner; 86.5dB manufacturer specified) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 1.25” dome tweeter, 6.5” mid-woofer |
| Weight | 18.5 lbs (8.4 kg) each | 28.7 lbs (13.0 kg) each |
| Woofer Cabinet | passive radiator | Bass reflex |
| Spinorama Preference Score | 6.33 | 4.66 |
| Spinorama Preference Score with Perfect Sub | 8.28 | 6.43 |
| DIY Kit | No | No |
| Crossover Frequency | - | 2600Hz |
| Power Handling | - | 40W nominal, 120W max |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: AsciLab C6B (measured by Erin’s Audio Corner) and Yamaha NS-800A (measured by Erin’s Audio Corner), via spinorama.org.
Related Speaker Comparisons
More top alternatives to AsciLab C6B:
- AsciLab C6B vs Perlisten S4b
- 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 14, 2026 at 2:38 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
AsciLab C6B: $1145 per pair Ascilab $1145 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
Yamaha NS-800A: $4,999.90 per pair The Music Room $4,999.90 eBay
Pros: Exceptionally well-built cabinet with no internal resonance issues at all: confirmed clean in both burst decay and impedance measurements. Good, wide directivity (~75 degrees horizontal) that stays consistent enough to EQ successfully. Distortion is low, staying under 3% at 96dB, and dynamic range holds up well until right near its 102dB limit. A shallower, higher-frequency bass rolloff profile (F3 68Hz, F10 35Hz) means it can be placed closer to the wall (about a foot) without turning boomy, actually gaining bass presence rather than losing it. Measured bass extension of 68Hz (-3dB), with a measured sensitivity of 84.9dB.
Cons: A wide, roughly 2kHz-10kHz scoop in the upper-midrange/lower-treble gives it a laidback, soft, low-attack character: notably worse than the reviewer’s Audio First Fidelia reference in an A/B comparison. On top of that, treble breaks up badly above 10kHz, swinging up as much as 8dB: a significant, named flaw. Sounds inconsistently voiced as a result (bright on some material like cymbals and shakers, dull/laidback on vocals and instrument attack) until corrected with real parametric EQ (the reviewer needed a +2dB boost around 4.5kHz at Q0.5 plus taming the treble spike to bring it to life) combined with near-wall placement and 30-degree toe-out. Without that combination, it’s a tough sale for a $5000 bookshelf speaker.
Full Yamaha NS-800A review and specifications →
| Released | 2024 (2 years ago) |
|---|---|
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 68Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 2600Hz |
| DIY Kit | No |
| Dimensions | 16.5”H x 9.1”W x 14.1”D (419.1 x 231.8 x 358.8 mm) |
| Drivers | 1.25” dome tweeter, 6.5” mid-woofer |
| Impedance | 6 ohms nominal, 4.3 ohms minimum (measured above 80Hz, Erin’s Audio Corner) |
| Power Handling | 40W nominal, 120W max |
| Sensitivity | 84.9dB (measured average 300Hz-3kHz @ 2.83V/1m, Erin’s Audio Corner; 86.5dB manufacturer specified) |
| Spinorama Preference Score | 4.66 |
| Spinorama Preference Score with Perfect Sub | 6.43 |
| Weight | 28.7 lbs (13.0 kg) each |
| Woofer Cabinet | Bass reflex |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Yamaha NS-800A vs Definitive Technology Demand D11
- Yamaha NS-800A vs ELAC DBR62
- Yamaha NS-800A vs Technics SB-C700
- Yamaha NS-800A vs Paradigm Persona B
- Yamaha NS-800A vs Focal Sopra N°1
- Yamaha NS-800A vs Dynaudio Contour 20i
- Yamaha NS-800A vs ELAC Uni-Fi Reference UBR62
- Yamaha NS-800A vs SVS Ultra Bookshelf
- See all 24 comparisons