Short answer: the Perlisten S4b. It ranks #2 of 222 bookshelf speakers by sound quality (rated 4.8/5); the AsciLab F6Bs ranks #20 (rated 4.5/5).
The case for the AsciLab F6Bs: A slimmer, sealed, VESA 100 wall mountable variant of the AsciLab F6B, trading the AsciLab 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 case for the Perlisten S4b: Reference-grade directivity and output from a compact sealed monitor. The catch: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification.
Buy the Perlisten S4b. It is rated higher for sound quality than the AsciLab F6Bs.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| AsciLab F6Bs | Perlisten S4b | |
|---|---|---|
| Price | €799 per pair | $8,000 per pair |
| Ranked | #20 of 222 in Large Size Bookshelf Speakers | #2 of 222 in Large Size Bookshelf Speakers |
| Enclosure | sealed | - |
| Drivers | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7” woofer |
| Dimensions | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) | 16.5”H x 9.4”W x 7.3”D |
| Weight | 12.3 lbs (5.6 kg) each | 24.3 lbs (11 kg) each |
| Sensitivity | 85.2dB @ 2.83V/1m (measured, Audio Science Review) | 84.5dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Impedance | 4 ohms nominal, 3.7 ohms minimum | Just under 4 ohms minimum (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 82.0Hz (measured, Audio Science Review) | 78Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 50.1Hz (measured, Audio Science Review) | 40Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 1kHz | - |
| Mounting | VESA 100 wall mount compatible | - |
| Warranty | 2 years | - |
| Country | South Korea | - |
| Maximum SPL | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) | - |
| Spinorama Preference Score | 5.24 | 5.35 |
| Spinorama Preference Score with Perfect Sub | 7.90 | 8.01 |
| DIY Kit | No | No |
| Woofer Cabinet | - | sealed |
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. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: AsciLab F6Bs (measured by Audio Science Review) and Perlisten S4b (measured by Erin’s Audio Corner), via spinorama.org.
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Prices on this page were last checked October 15, 2026 at 5:41 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 the AsciLab F6B, trading the AsciLab 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 AsciLab 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 |
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Perlisten S4b: $8,000 per pair Perlisten Dealer Locator $8,000 eBay
Same family: the Perlisten S5m (larger bookshelf, ranked lower, rated 4.4/5), the Perlisten S5t (smaller floorstanding, estimated 4.5/5), the Perlisten S7t (larger floorstanding, rated 4.5/5), the Perlisten S5c (smaller center, estimated 4.5/5), the Perlisten S7c (larger center, rated 4.6/5) and the Perlisten S4s (surround, rated 4.6/5).
Pros: Reference-grade directivity and output from a compact sealed monitor. Erin called its radiation behavior the smoothest he had measured: Perlisten’s DPC array (beryllium tweeter between two midrange domes) shapes vertical output while transitioning cleanly to the 7-inch woofer. Harmonic distortion remains below 1% at 86dB and, above 100Hz, also below 1% at 96dB; compression is exceptionally low. The response is highly linear, the midrange was a listening highlight, and the sealed F10 of 40Hz provides a predictable slope for subwoofer integration. Measured bass extension of 78Hz (-3dB), with a measured sensitivity of 84.5dB.
Cons: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification. Its 78Hz F3 means a subwoofer is effectively mandatory for full-range listening despite the 40Hz F10. A roughly +3dB feature around 10kHz appears on-axis, though Erin did not find it objectionable. Price is extreme for a stand-mount and the tightly managed vertical radiation makes correct stand height important.
Full Perlisten S4b review and specifications →
| Released | Jun 2021 (5 years ago) |
|---|---|
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 78Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 16.5”H x 9.4”W x 7.3”D |
| Drivers | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7” woofer |
| Impedance | Just under 4 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 84.5dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.35 |
| Spinorama Preference Score with Perfect Sub | 8.01 |
| Weight | 24.3 lbs (11 kg) each |
| Woofer Cabinet | sealed |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons