Short answer: the Sonus Faber Sonetto II G2 for better sound quality, the KEF Q350 for the lower price. The Sonus Faber Sonetto II G2 ranks #74 of 100 bookshelf speakers at $3500. The KEF Q350 ranks #76 at $699, $2801 cheaper.
What the Sonus Faber Sonetto II G2 gets right: Two-way design with a 1.125” damped Apex Dome silk tweeter and 6.5” cone woofer, using a base of concrete, aluminum, and steel with under-cabinet venting. The catch: Sounds notably bright pointed directly on-axis; toeing the speaker out about 30° reduces treble energy and sibilance meaningfully.
What the KEF Q350 offers: CEA2034 spinorama shows a reasonably flat on-axis response with excellent directivity, aided by the coaxial Uni-Q driver. Watch for: Two resonances at 700Hz and 1.2kHz show up on-axis, alongside an upper-bass boost.
Buy the Sonus Faber Sonetto II G2 if sound quality matters more than the price. Buy the KEF Q350 if the price matters more than sound quality.
If sound quality matters at all to you, skip the KEF Q350. It ranks near the bottom of the 100 bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| Sonus Faber Sonetto II G2 | KEF Q350 | |
|---|---|---|
| Price | $3500 | $699.00 Discontinued |
| Ranked | #74 of 100 in Large Size Bookshelf Speakers | #76 of 100 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 62Hz (measured, Erin’s Audio Corner) | 70Hz (measured, Audio Science Review) |
| Impedance | 4 ohms nominal (4.2 ohms minimum, measured by Erin’s Audio Corner) | 4 ohms |
| Sensitivity | 87dB (measured, Erin’s Audio Corner) | 86dB (measured, Audio Science Review) |
| Drivers | 1x 6.5" mid-woofer (paper cone), 1x 1.1" (28mm) DAD soft dome tweeter | 25mm tweeter + 165mm woofer |
| Weight | 38.4 lbs / 17.4 kg | 29.5 lbs / 13.4 kg |
| Dimensions | 16.3"H x 8.9"W x 14"D (414.3 x 227.0 x 355.6 mm) | 14.1"H x 8.3"W x 12"D (358.0 x 210.0 x 306.0 mm) |
| Woofer Cabinet | ported, front | ported, rear |
| Discontinued | - | Yes |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Sonus Faber Lumina II Amator vs Wharfedale Diamond 9.1
- Pylon Jasper Monitor 18 vs Sonus Faber Lumina II Amator
- Sonus Faber Lumina II Amator vs B&W 805S
- Polk Reserve R100 vs Sonus Faber Sonetto II G2
- Polk R200 vs Sonus Faber Sonetto II G2
The Two Speakers In Full
Sonus Faber Sonetto II G2: $3500 Crutchfield
Pros: Two-way design with a 1.125” damped Apex Dome silk tweeter and 6.5” cone woofer, using a base of concrete, aluminum, and steel with under-cabinet venting. Notably more neutral than Sonus Faber’s own Lumina 2, which runs 2-5dB hotter in the treble. Horizontal directivity narrows at a fairly constant, well-behaved rate rather than narrowing-then-widening-then-narrowing like some rivals (including the Lumina 2), meaning sidewall reflections match the direct sound well enough that the reviewer doesn’t recommend sidewall absorption for this speaker. The tweeter-to-woofer crossover handoff around 3kHz looks clean, suggesting a higher-order crossover than typical for the size/price class. Good dynamic range - the low end loses only about 2dB from 76dB to 96dB, otherwise holding up well. Not a difficult amplifier load (about 4.2 ohms minimum impedance). Bass extension reaches a genuine 50Hz in-room, fuller than the Lumina 2.
Cons: Sounds notably bright pointed directly on-axis; toeing the speaker out about 30° reduces treble energy and sibilance meaningfully. A resonance around 700Hz gives vocals a slightly nasal, hollow quality. A dip in the upper midrange (roughly 1-2kHz) reduces perceived detail and attack, while the elevated treble can read as “analytical” or “detailed” to some listeners despite being a coloration rather than true resolution. Needs more clearance from the rear wall than some rivals - about 1.5-2 feet in an ideal room, more or less depending on your specific room modes - or the 80-120Hz region can become boomy. Vertical listening window is limited to about ±10-15° from the tweeter axis. Some unexplained directivity irregularities appear around 1.2kHz and 1.6kHz, possibly port-related, along with a longer decay in the 800Hz-1600Hz range in burst-decay measurements. Multitone distortion approaches the reviewer’s 3% threshold through the midrange, though likely not obviously audible without direct A/B comparison. A resonance in the cabinet appears around 400Hz in impedance measurements.
Full Sonus Faber Sonetto II G2 review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 62Hz (measured, Erin's Audio Corner) |
| Dimensions | 16.3"H x 8.9"W x 14"D (414.3 x 227.0 x 355.6 mm) |
| Drivers | 1x 6.5" mid-woofer (paper cone), 1x 1.1" (28mm) DAD soft dome tweeter |
| Impedance | 4 ohms nominal (4.2 ohms minimum, measured by Erin's Audio Corner) |
| Sensitivity | 87dB (measured, Erin's Audio Corner) |
| Weight | 38.4 lbs / 17.4 kg |
| Woofer Cabinet | ported, front |
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- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sonus Faber Sonetto II G2 vs Audio Craftsmen Victoria
- Sonus Faber Sonetto II G2 vs Pylon Jasper Monitor 18
- Sonus Faber Sonetto II G2 vs Emotiva Airmotiv B2+
- Sonus Faber Sonetto II G2 vs Sonus Faber Lumina II Amator
- Sonus Faber Sonetto II G2 vs JBL XPL-90
- Sonus Faber Sonetto II G2 vs Polk Reserve R100
- Sonus Faber Sonetto II G2 vs Klipsch RP-600M
- Sonus Faber Sonetto II G2 vs Polk R200
- See all 15 comparisons
KEF Q350: $699.00 Discontinued Amazon
Pros: CEA2034 spinorama shows a reasonably flat on-axis response with excellent directivity, aided by the coaxial Uni-Q driver. Vertical directivity is better than most non-coaxial two-way speakers, another benefit of the concentric design.
Cons: Two resonances at 700Hz and 1.2kHz show up on-axis, alongside an upper-bass boost. Predicted in-room response looks a bit boomy as a result. Distortion climbs substantially in the 100Hz-1kHz range at 96dB SPL/1m, with a distinct resonance-driven peak around 900Hz-1kHz at both test levels. Discontinued.
Full KEF Q350 review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 70Hz (measured, Audio Science Review) |
| Dimensions | 14.1"H x 8.3"W x 12"D (358.0 x 210.0 x 306.0 mm) |
| Discontinued | Yes |
| Drivers | 25mm tweeter + 165mm woofer |
| Impedance | 4 ohms |
| Sensitivity | 86dB (measured, Audio Science Review) |
| Weight | 29.5 lbs / 13.4 kg |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons