Short answer: the Ascend Acoustics Sierra-LX. It ranks #33 of 130 bookshelf speakers by sound quality at $1598; the Sonus Faber Lumina II Amator ranks #106 and costs $2000, so there is little reason to consider the other one.
What the Ascend Acoustics Sierra-LX offers: Very neutral, flat frequency response - within about plus or minus 1.5dB ignoring one narrow dip. Bass extension down to about 40Hz in-room despite the compact size. Wide, well-balanced soundstage (~60 degrees). Solid build quality with a laminated bamboo cabinet. Watch for: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels. Noticeable midrange distortion becomes audible above about 82-83dB SPL. A narrow dip around 3.5kHz on-axis in larger rooms without sidewall reflections - toeing the speakers out 10-20 degrees fills it in, but adds some brightness to the treble. Sensitive to listening height - sitting even slightly above or below tweeter level noticeably shifts the tonal balance.
What the Sonus Faber Lumina II Amator offers: Solid bass extension for a bookshelf (F3 63Hz, F10 43Hz), reaching about 50Hz in-room. Decent sensitivity and wide, consistent horizontal dispersion (~60-70 degrees) - better directivity than expected for a two-way design. Gorgeous, luxury-grade cabinet design. Watch for: Very bright treble, running 3-6dB above the midrange depending on measurement angle - independently corroborated by other owners online, not just one reviewer’s opinion. Causes audible sibilance and a forward, grainy character. Notably the brightest of three Sonus Faber models Erin’s Audio Corner has tested, even brighter than the brand’s own Sonetto II G2. A mechanical resonance/ringing artifact shows up around 1kHz in measurements. Needs a subwoofer for anything below about 50Hz.
Buy the Ascend Acoustics Sierra-LX. It ranks higher for sound quality than the Sonus Faber Lumina II Amator and costs less, which settles it without a real tradeoff to make.
The Sonus Faber Lumina II Amator is not a sound-quality pick. It sits near the bottom of the 130 bookshelf speakers; there are better options higher up.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Ascend Acoustics Sierra-LX | Sonus Faber Lumina II Amator | |
|---|---|---|
| Price | $1598 per pair | $2000 per pair |
| Ranked | #33 of 130 in Large Size Bookshelf Speakers | #106 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin's Audio Corner) | 43Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin's Audio Corner) | 63Hz (measured, Erin's Audio Corner) |
| Dimensions | 14.3" x 7.5" x 10.5" (362 x 191 x 267 mm) | 12" x 7.1" x 10.4" (304 x 180 x 263 mm) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 4 ohms nominal, 3.9 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin's Audio Corner) | 86.9dB (2.83V/1m, measured by Erin's Audio Corner) |
| Drivers | 6" aluminum cone woofer, 26mm dome tweeter | 1.14" DAD (Damped Apex Dome) tweeter, 5.9" paper cone woofer |
| Weight | 20.9 lbs (9.5 kg) | 12.8 lbs (5.8 kg) |
| Woofer Cabinet | Bass reflex, flared rear port | Bass reflex, ported |
| Power Handling | 350W continuous, 500W peak | - |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | 55Hz - 24kHz (Manufacturer specified) |
| Country | USA | Italy (Vicenza) |
| Spinorama Preference Score | 5.93 | - |
| Spinorama Preference Score with Perfect Sub | 7.74 | - |
| Crossover Frequency | - | 2600Hz |
| Recommended Power | - | 30W - 150W |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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-LX: $1598 per pair Ascend Acoustics eBay
Pros: Very neutral, flat frequency response - within about plus or minus 1.5dB ignoring one narrow dip. Bass extension down to about 40Hz in-room despite the compact size. Wide, well-balanced soundstage (~60 degrees). Solid build quality with a laminated bamboo cabinet. Measured bass extension of 47Hz (-3dB), with a measured sensitivity of 81dB.
Cons: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels. Noticeable midrange distortion becomes audible above about 82-83dB SPL. A narrow dip around 3.5kHz on-axis in larger rooms without sidewall reflections - toeing the speakers out 10-20 degrees fills it in, but adds some brightness to the treble. Sensitive to listening height - sitting even slightly above or below tweeter level noticeably shifts the tonal balance.
Full Ascend Acoustics Sierra-LX review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 47Hz (measured, Erin's Audio Corner) |
| Country | USA |
| Dimensions | 14.3" x 7.5" x 10.5" (362 x 191 x 267 mm) |
| Drivers | 6" aluminum cone woofer, 26mm dome tweeter |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) |
| Power Handling | 350W continuous, 500W peak |
| Sensitivity | 81dB (2.83V/1m, measured by Erin's Audio Corner) |
| Spinorama Preference Score | 5.93 |
| Spinorama Preference Score with Perfect Sub | 7.74 |
| Weight | 20.9 lbs (9.5 kg) |
| Woofer Cabinet | Bass reflex, flared rear port |
- Links
- Reviews, Comparisons and Sound Samples
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Sonus Faber Lumina II Amator: $2000 per pair Crutchfield eBay
Pros: Solid bass extension for a bookshelf (F3 63Hz, F10 43Hz), reaching about 50Hz in-room. Decent sensitivity and wide, consistent horizontal dispersion (~60-70 degrees) - better directivity than expected for a two-way design. Gorgeous, luxury-grade cabinet design. Measured bass extension of 63Hz (-3dB), with a measured sensitivity of 86.9dB.
Cons: Very bright treble, running 3-6dB above the midrange depending on measurement angle - independently corroborated by other owners online, not just one reviewer’s opinion. Causes audible sibilance and a forward, grainy character. Notably the brightest of three Sonus Faber models Erin’s Audio Corner has tested, even brighter than the brand’s own Sonetto II G2. A mechanical resonance/ringing artifact shows up around 1kHz in measurements. Needs a subwoofer for anything below about 50Hz.
Full Sonus Faber Lumina II Amator review and specifications →
| Bass Extension (-10dB) | 43Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 63Hz (measured, Erin's Audio Corner) |
| Country | Italy (Vicenza) |
| Crossover Frequency | 2600Hz |
| Dimensions | 12" x 7.1" x 10.4" (304 x 180 x 263 mm) |
| Drivers | 1.14" DAD (Damped Apex Dome) tweeter, 5.9" paper cone woofer |
| Frequency Response | 55Hz - 24kHz (Manufacturer specified) |
| Impedance | 4 ohms nominal, 3.9 ohms minimum (measured, Erin's Audio Corner) |
| Recommended Power | 30W - 150W |
| Sensitivity | 86.9dB (2.83V/1m, measured by Erin's Audio Corner) |
| Weight | 12.8 lbs (5.8 kg) |
| Woofer Cabinet | Bass reflex, ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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