Short answer: the AsciLab A6B Passive for measured flatness, the Epos ES14N for a classic revival. The A6B pairs a Purifi 6.5 inch aluminum cone woofer with two side-mounted passive radiators and a Klippel NFS optimized crossover for a measured 41.0Hz extension and a -0.10dB per octave on-axis slope. Its 4 ohm impedance and 82dB sensitivity call for a robust amplifier; the ES14N’s sound power directivity standard deviation of 5.18 is the widest here.
Buy the AsciLab A6B Passive or the Epos ES14N on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| AsciLab A6B Passive | Epos ES14N | |
|---|---|---|
| Price | €3,790 per pair | £3,750 per pair |
| Ranked | #18 of 134 in Large Size Bookshelf Speakers | #19 of 134 in Large Size Bookshelf Speakers |
| Enclosure | sealed with passive radiators | ported |
| Drivers | 1” dome tweeter, 6.5” Purifi aluminum cone woofer, 2x 6.5” Purifi passive radiators | 28mm aluminum/ceramic compound dome tweeter, 7” mica filled polypropylene cone woofer |
| Dimensions | 15.9”H x 8.7”W x 11.8”D (405 x 220 x 300 mm) | 19.3”H x 9.8”W x 15.2”D (491 x 250 x 385 mm) |
| Weight | 27.1 lbs (12.3 kg) each | 35.3 lbs (16 kg) each |
| Sensitivity | 82dB @ 2.83V/1m | 87dB @ 2.823V/1m |
| Impedance | 4 ohms nominal | 6 ohms nominal, 4.3 ohms minimum |
| Bass Extension (-3dB) | 41.0Hz (measured, Audio Science Review) | 51.2Hz (measured, spinorama.org data) |
| Bass Extension (-10dB) | 34.7Hz (measured, Audio Science Review) | 35.3Hz (measured, spinorama.org data) |
| Crossover Frequency | 1kHz | 2.7kHz |
| Warranty | 2 years | - |
| Country | South Korea | Germany |
| Maximum SPL | 102dB full bandwidth, 106dB above 100Hz (manufacturer specified) | - |
| Spinorama Preference Score | 6.50 | 6.22 |
| Spinorama Preference Score with Perfect Sub | 8.24 | 7.82 |
| DIY Kit | No | No |
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Prices on this page were last checked October 3, 2026 at 10:26 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 A6B Passive: €3,790 per pair Audiophonics eBay
Pros: A Purifi 6.5 inch aluminum cone woofer works with two side mounted passive radiators and a Klippel NFS optimized crossover to reach a measured 41.0Hz extension point with an on axis slope of just -0.10dB per octave, essentially flat. On axis deviation measures 0.071dB average, the tightest figure of any speaker added to this catalog from spinorama.org’s current measurement set. Listening window smoothness (0.60) sits in line with AsciLab’s other highly rated bookshelf models already in this catalog. Measured bass extension of 41.0Hz (-3dB).
Cons: 4 ohm nominal impedance and 82dB sensitivity call for a robust amplifier. AsciLab and its resellers frequently list the A6B as sold out or preorder only, and reported prices vary widely by source and region, from roughly $2,900 to over $3,900 per pair, so confirm the current listing before buying. Tweeter material is described inconsistently between sources (alumina ceramic dome versus an SB Acoustics unit), worth verifying directly with a reseller if that detail matters to you.
Full AsciLab A6B Passive review and specifications →
| Bass Extension (-10dB) | 34.7Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 41.0Hz (measured, Audio Science Review) |
| Country | South Korea |
| Crossover Frequency | 1kHz |
| DIY Kit | No |
| Dimensions | 15.9”H x 8.7”W x 11.8”D (405 x 220 x 300 mm) |
| Drivers | 1” dome tweeter, 6.5” Purifi aluminum cone woofer, 2x 6.5” Purifi passive radiators |
| Enclosure | sealed with passive radiators |
| Impedance | 4 ohms nominal |
| Maximum SPL | 102dB full bandwidth, 106dB above 100Hz (manufacturer specified) |
| Sensitivity | 82dB @ 2.83V/1m |
| Spinorama Preference Score | 6.50 |
| Spinorama Preference Score with Perfect Sub | 8.24 |
| Warranty | 2 years |
| Weight | 27.1 lbs (12.3 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Epos ES14N: £3,750 per pair Audio Venue (UK) eBay
Pros: A revival of Epos’s classic 1980s ES-14, re-engineered by Karl-Heinz Fink’s FinkTeam with a chamfered, backward sloping baffle to time align a 28mm ceramic coated dome tweeter with a 7 inch mica filled polypropylene woofer. On axis deviation measures a clean 0.22dB average and the listening window response is smooth, and the larger woofer reaches a measured 51.2Hz at -3dB with a low 0.2% THD at 1W. Measured bass extension of 51.2Hz (-3dB).
Cons: Off axis sound tracks the on axis response less consistently than most measured speakers as frequency rises, so the room’s reflected sound differs more from what you hear directly. The bass alignment also measures a higher Q of 1.10, hinting at a mild bump near the port tuning frequency. At £3,750 to £4,400/pair depending on finish it is a serious investment, and dealer availability is limited outside the UK and Canada.
Full Epos ES14N review and specifications →
| Bass Extension (-10dB) | 35.3Hz (measured, spinorama.org data) |
|---|---|
| Bass Extension (-3dB) | 51.2Hz (measured, spinorama.org data) |
| Country | Germany |
| Crossover Frequency | 2.7kHz |
| DIY Kit | No |
| Dimensions | 19.3”H x 9.8”W x 15.2”D (491 x 250 x 385 mm) |
| Drivers | 28mm aluminum/ceramic compound dome tweeter, 7” mica filled polypropylene cone woofer |
| Enclosure | ported |
| Impedance | 6 ohms nominal, 4.3 ohms minimum |
| Sensitivity | 87dB @ 2.823V/1m |
| Spinorama Preference Score | 6.22 |
| Spinorama Preference Score with Perfect Sub | 7.82 |
| Weight | 35.3 lbs (16 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons