Short answer: the AsciLab F6Bs. It ranks #20 of 222 bookshelf speakers by sound quality (rated 4.5/5); the Ascend Acoustics Sierra-2EX V2 ranks #42 (rated 4.3/5).
The Ascend Acoustics Sierra-2EX V2 is the more accurate, deeper-bass option. A RAAL true ribbon tweeter is paired with a custom SEAS Excel Curv woofer, with the crossover optimized against Klippel NFS measurement data. Its measured preference score, a predictor of how neutral it sounds, is 5.88 against 5.24 for the AsciLab F6Bs. Its bass reaches about 58.6Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. The tradeoff: On-axis response is relatively uneven, with an average deviation of about 0.45dB, so a listener sitting dead center may notice more unevenness than with smoother AsciLab or Ascend towers.
Why pick 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.
Buy the AsciLab F6Bs. It is rated higher for sound quality than the Ascend Acoustics Sierra-2EX V2.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Ascend Acoustics Sierra-2EX V2 | AsciLab F6Bs | |
|---|---|---|
| Price | $1,748 per pair | €799 per pair |
| Ranked | #42 of 222 in Large Size Bookshelf Speakers | #20 of 222 in Large Size Bookshelf Speakers |
| Enclosure | ported | sealed |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 12.3 lbs (5.6 kg) each |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Impedance | 8 ohms nominal | 4 ohms nominal, 3.7 ohms minimum |
| Power Handling | 150W continuous, 300W peak | - |
| Frequency Response | 51-27,000Hz +/-3dB (manufacturer) | - |
| Bass Extension (-6dB) | 51.3Hz (measured, spinorama.org vendor data) | - |
| Bass Extension (-3dB) | 58.6Hz (measured, spinorama.org vendor data) | 82.0Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) | 50.1Hz (measured, Audio Science Review) |
| Warranty | 7 years parts and labor | 2 years |
| Country | United States | South Korea |
| Spinorama Preference Score | 5.88 | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.95 | 7.90 |
| DIY Kit | No | No |
| Crossover Frequency | - | 1kHz |
| Mounting | - | VESA 100 wall mount compatible |
| Maximum SPL | - | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) |
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: Ascend Acoustics Sierra-2EX V2 (measured by the manufacturer) and AsciLab F6Bs (measured by Audio Science Review), via spinorama.org.
Related Speaker Comparisons
How AsciLab F6Bs compares with other leading options:
- AsciLab F6Bs vs Perlisten S4b
- AsciLab F6Bs vs KEF Reference 1 Meta
- AsciLab F6Bs vs GR-Research NX-Studio
- AsciLab C6B vs AsciLab F6Bs
- Audio First Cadentia 3 vs AsciLab F6Bs
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
Ascend Acoustics Sierra-2EX V2: $1,748 per pair Ascend Acoustics $1,748 eBay
Older model: the Ascend Acoustics Sierra 2 (ranked lower, rated 3.7/5). See every Ascend Sierra generation.
Same family: the Ascend Acoustics Sierra 1 v2 (smaller bookshelf, rated 4.7/5), the Ascend Acoustics Sierra-LX (larger bookshelf, ranked higher, rated 4.3/5), the Ascend Acoustics Sierra Titan Tower (floorstanding, rated 4.4/5) and the Ascend Acoustics Sierra Horizon V2 (center, estimated 4.3/5).
Pros: A RAAL true ribbon tweeter is paired with a custom SEAS Excel Curv woofer, with the crossover optimized against Klippel NFS measurement data. Listening window smoothness measures 0.45, a moderate but usable figure for a compact standmount. Pairs are hand matched within +/-1.5dB and shipped with their own individual frequency response printout, backed by a 7 year parts and labor warranty from direct USA assembly in Orange County, California. Measured bass extension of 58.6Hz (-3dB).
Cons: On-axis response is relatively uneven, with an average deviation of about 0.45dB, so a listener sitting dead center may notice more unevenness than with smoother AsciLab or Ascend towers. Bass extension is modest for the price class at a measured 51.3Hz at -6dB. Ascend sells direct only, with no dealer network or third party retailers for an in person audition.
Full Ascend Acoustics Sierra-2EX V2 review and specifications →
| Released | Sep 2022 (4 years ago) |
|---|---|
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) |
| Bass Extension (-3dB) | 58.6Hz (measured, spinorama.org vendor data) |
| Bass Extension (-6dB) | 51.3Hz (measured, spinorama.org vendor data) |
| Country | United States |
| DIY Kit | No |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer |
| Enclosure | ported |
| Frequency Response | 51-27,000Hz +/-3dB (manufacturer) |
| Impedance | 8 ohms nominal |
| Power Handling | 150W continuous, 300W peak |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) |
| Spinorama Preference Score | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.95 |
| Warranty | 7 years parts and labor |
| Weight | 20.1 lbs (9.1 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics Sierra-2EX V2 vs Selah Audio Integrity
- Ascend Acoustics Sierra-2EX V2 vs Philharmonic BMR (v1)
- Ascend Acoustics Sierra-2EX V2 vs Revel M126Be
- Ascend Acoustics Sierra-2EX V2 vs Ascend Acoustics Sierra-LX
- Ascend Acoustics Sierra-2EX V2 vs Wharfedale Linton 85
- Ascend Acoustics Sierra-2EX V2 vs Emotiva Airmotiv XB2
- Ascend Acoustics Sierra-2EX V2 vs ELAC Debut 3.0 DB63
- Ascend Acoustics Sierra-2EX V2 vs Perlisten A3m
- See all 46 comparisons
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 |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- AsciLab F6Bs vs Epos ES14N
- AsciLab F6Bs vs MoFi SourcePoint 8
- AsciLab F6Bs vs Arendal 1528 Monitor 8
- AsciLab F6Bs vs Buchardt Audio E50
- AsciLab F6Bs vs Ascend Acoustics CMT-340 SE2
- AsciLab F6Bs vs Wharfedale Super Linton
- AsciLab F6Bs vs KEF R3
- AsciLab F6Bs vs Wharfedale Aura 2
- See all 47 comparisons