Short answer: a tie on sound quality. Both are rated 4.5/5 (#20 and #16 of 203 bookshelf speakers), so choose on features and fit.
The case for the AsciLab F6Bs: A slimmer, sealed, VESA 100 wall mountable variant of AsciLab’s F6B, trading the F6B’s passive radiator for a shallower 15.4cm deep cabinet that can go straight on a wall bracket. The catch: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio.
The Buchardt Audio E50 is the more accurate, deeper-bass option. Exceptional bass extension for a bookshelf (F3 at 40Hz, F10 at 34Hz) with genuinely low-end weight the reviewer kept noticing track after track, not just a single room-boosted note. Its measured preference score, a predictor of how neutral it sounds, is 5.84 against 5.24 for the AsciLab F6Bs. Its bass reaches about 40Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. The catch: A roughly 3dB dip in the upper midrange/lower treble softens attack and dialogue clarity: the reviewer’s main complaint, and it’s baked into the crossover rather than a directivity artifact, so it’s audible both on and off axis.
Buy the AsciLab F6Bs or the Buchardt Audio E50 on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| AsciLab F6Bs | Buchardt Audio E50 | |
|---|---|---|
| Price | €799 per pair | $4600 per pair |
| Ranked | #20 of 203 in Large Size Bookshelf Speakers | #16 of 203 in Large Size Bookshelf Speakers |
| Enclosure | sealed | - |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer | 1” Scanspeak dome tweeter with waveguide, 6.5” Purifi extended-stroke woofer, dual 6.5” passive radiators |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) | 15.6” x 7.5” x 11.2” (395 x 190 x 284 mm) |
| Weight | 12.3 lbs (5.6 kg) each | 19 lbs (8.6 kg) each |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) | 83.1dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Impedance | 4 ohms nominal, 3.7 ohms minimum | 4 ohms nominal |
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) | 40Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) | 34Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 1kHz | 2000Hz |
| Mounting | VESA 100 wall mount compatible | - |
| Warranty | 2 years | - |
| Country | South Korea | Denmark |
| Maximum SPL | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) | - |
| Spinorama Preference Score | 5.24 | 5.84 |
| Spinorama Preference Score with Perfect Sub | 7.90 | 7.61 |
| DIY Kit | No | No |
| Woofer Cabinet | - | Passive radiator loaded |
| Frequency Response | - | 36Hz - 30kHz ±3dB (Manufacturer specified) |
| Recommended Power | - | 60W - 200W |
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How Buchardt Audio E50 compares with other leading options:
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- Audio First Cadentia 3 vs Buchardt Audio E50
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 F6Bs: €799 per pair Audiophonics eBay
Same family: the AsciLab F6B (smaller bookshelf, ranked higher, rated 4.6/5).
Pros: A slimmer, sealed, VESA 100 wall mountable variant of AsciLab’s F6B, trading the F6B’s passive radiator for a shallower 15.4cm deep cabinet that can go straight on a wall bracket. Off axis sound tracks the on axis response unusually consistently for a sealed 2-way this size, and on axis deviation measures a clean 0.25dB average. Measured bass extension of 82.0Hz (-3dB), with a measured sensitivity of 85.2dB.
Cons: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio. Bass extension is measured at 82.0Hz at -3dB, noticeably less than the passive radiator equipped F6B, and listening window smoothness measures only a moderate 0.39. The 4 ohm nominal impedance calls for a reasonably capable amplifier.
Full AsciLab F6Bs review and specifications →
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) |
| Country | South Korea |
| Crossover Frequency | 1kHz |
| DIY Kit | No |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Enclosure | sealed |
| Impedance | 4 ohms nominal, 3.7 ohms minimum |
| Maximum SPL | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) |
| Mounting | VESA 100 wall mount compatible |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Spinorama Preference Score | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.90 |
| Warranty | 2 years |
| Weight | 12.3 lbs (5.6 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
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Buchardt Audio E50: $4600 per pair Buchardt Audio eBay
Pros: Exceptional bass extension for a bookshelf (F3 at 40Hz, F10 at 34Hz) with genuinely low-end weight the reviewer kept noticing track after track, not just a single room-boosted note. Mid and lower-midrange are very neutral with no coloration and well-executed baffle-step compensation, so it doesn’t need to sit close to a wall like many bookshelf designs. Low distortion throughout the midrange, controlled ~60-degree horizontal directivity, and a striking driver/waveguide integration that looks genuinely upscale. Measured bass extension of 40Hz (-3dB), with a measured sensitivity of 83.1dB.
Cons: A roughly 3dB dip in the upper midrange/lower treble softens attack and dialogue clarity: the reviewer’s main complaint, and it’s baked into the crossover rather than a directivity artifact, so it’s audible both on and off axis. Sounds too bright pointed directly at the listener; needs about 10-20 degrees of toe-out to tame the treble and slightly smooth (not eliminate) that dip. Below-average sensitivity (measured 83.1dB vs 85dB spec) calls for a beefier amp, and the speaker’s tonal balance is unusually sensitive to amplifier output impedance: a poor tube amp can shift the midrange by up to 2dB.
Full Buchardt Audio E50 review and specifications →
| Bass Extension (-10dB) | 34Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 40Hz (measured, Erin’s Audio Corner) |
| Country | Denmark |
| Crossover Frequency | 2000Hz |
| DIY Kit | No |
| Dimensions | 15.6” x 7.5” x 11.2” (395 x 190 x 284 mm) |
| Drivers | 1” Scanspeak dome tweeter with waveguide, 6.5” Purifi extended-stroke woofer, dual 6.5” passive radiators |
| Frequency Response | 36Hz - 30kHz ±3dB (Manufacturer specified) |
| Impedance | 4 ohms nominal |
| Recommended Power | 60W - 200W |
| Sensitivity | 83.1dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 5.84 |
| Spinorama Preference Score with Perfect Sub | 7.61 |
| Weight | 19 lbs (8.6 kg) each |
| Woofer Cabinet | Passive radiator loaded |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Buchardt Audio E50 vs KEF R3
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