Short answer: the AsciLab C6B. It ranks #6 of 222 bookshelf speakers by sound quality, rated 4.7/5, at $1,145; the Dynaudio Heritage Special ranks #29, rated 4.4/5, and costs $7,000, which makes this an easy call rather than a real tradeoff.
The AsciLab C6B is the more accurate choice. 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 4.32 for the Dynaudio Heritage Special. The catch: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
What the Dynaudio Heritage Special does well: One of the rare cases where the reviewer measured a speaker as flawed but still genuinely enjoyed listening to it. Watch for: At lower listening volumes, dynamic range and kick-drum punch fell short of higher-sensitivity speakers the reviewer has tested (JBL 4367, KEF Reference 1 Meta): the sheer output ceiling is impressive, but it isn’t a highly dynamic-sounding speaker at modest levels.
Buy the AsciLab C6B. It is rated higher for sound quality than the Dynaudio Heritage Special and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| AsciLab C6B | Dynaudio Heritage Special | |
|---|---|---|
| Price | $1145 per pair | $7,000 per pair |
| Ranked | #6 of 222 in Large Size Bookshelf Speakers | #29 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 52Hz (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) | 15.2”H x 8.2”W x 12.6”D (385 x 208 x 320 mm) |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 5.1 ohms minimum, ported mode (measured, Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 85dB (measured at 2.83V/1m, Erin’s Audio Corner) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 18cm MSP cone woofer, 28mm Esotar 3 dome tweeter |
| Weight | 18.5 lbs (8.4 kg) each | 24.3 lbs (11 kg) each |
| Woofer Cabinet | passive radiator | - |
| Spinorama Preference Score | 6.33 | 4.32 |
| Spinorama Preference Score with Perfect Sub | 8.28 | 6.33 |
| DIY Kit | No | No |
| Country | - | Denmark |
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 Dynaudio Heritage Special (measured by Erin’s Audio Corner), via spinorama.org.
Related Speaker Comparisons
How AsciLab C6B compares with other leading options:
- 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
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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
Dynaudio Heritage Special: $7,000 per pair Safe and Sound HQ $7,000 eBay
Pros: One of the rare cases where the reviewer measured a speaker as flawed but still genuinely enjoyed listening to it. A massive 4” voice coil on the midwoofer gives it exceptional output capability for a bookshelf speaker: averaged 100dB at 3.5 meters with no audible mechanical noise, port chuffing, or woofer bottoming even when deliberately pushed hard. Bass is very robust and doesn’t noticeably give up output as volume increases, staying solid at both low and high listening levels. Big, well-proportioned soundstage: wide without losing image focus. Limited run of 2,500 pairs with genuine collectible/heritage value; the tweeter (Esotar 3) and midwoofer both use premium Dynaudio-made drivers with an unusually wide, stout voice coil. Measured bass extension of 52Hz (-3dB), with a measured sensitivity of 85dB.
Cons: At lower listening volumes, dynamic range and kick-drum punch fell short of higher-sensitivity speakers the reviewer has tested (JBL 4367, KEF Reference 1 Meta): the sheer output ceiling is impressive, but it isn’t a highly dynamic-sounding speaker at modest levels. A degree of “softness” in the upper mid-range. Selective sibilance in the 4-6kHz treble region that shows up on some tracks but not others, which the reviewer found mildly aggravating and would want to EQ down given the choice. Neither the tweeter nor the woofer is fully flush-mounted to the baffle, likely intentional as part of the heritage-styled look, but the reviewer wonders how much this affected linearity. At $7000/pair (and a discontinued limited run, so used/open-box pricing around $5,000/pair is about the best you’ll do now), this is a serious investment for a bookshelf speaker.
Full Dynaudio Heritage Special review and specifications →
| Released | Nov 2020 (5 years ago) |
|---|---|
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 52Hz (measured, Erin’s Audio Corner) |
| Country | Denmark |
| DIY Kit | No |
| Dimensions | 15.2”H x 8.2”W x 12.6”D (385 x 208 x 320 mm) |
| Drivers | 18cm MSP cone woofer, 28mm Esotar 3 dome tweeter |
| Impedance | 5.1 ohms minimum, ported mode (measured, Erin’s Audio Corner) |
| Sensitivity | 85dB (measured at 2.83V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.32 |
| Spinorama Preference Score with Perfect Sub | 6.33 |
| Weight | 24.3 lbs (11 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Dynaudio Heritage Special vs Radiant Acoustics Clarity 6.2
- Dynaudio Heritage Special vs MoFi SourcePoint 10
- Dynaudio Heritage Special vs Wharfedale Super Linton
- Dynaudio Heritage Special vs Ascend Acoustics CMT-340 SE2
- Dynaudio Heritage Special vs Arendal 1528 Monitor 8
- Dynaudio Heritage Special vs Wharfedale Linton 85
- Dynaudio Heritage Special vs Ascend Acoustics Sierra-LX
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