Short answer: the Fosi Audio SP601, if you are buying new. The KEF Q350 ranks higher than it (#106 vs #113 of 131 bookshelf speakers, 3.0/5 vs 2.7/5) but is discontinued, so only consider it used; the Fosi Audio SP601 is still sold new at $339.99.
Why pick the KEF Q350: 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.
What the Fosi Audio SP601 does well: Two-way bookshelf design with a 6.5” paper/aluminum-alloy composite cone woofer and 1.5” silk dome tweeter. The catch: An unusually erratic, up-and-down frequency response (a scooped midrange followed by an upper-mid bump, a dip, another small bump, then a strong 3-4dB peak around 4-7kHz) makes the speaker’s overall character genuinely hard to characterize: the reviewer compared the experience to a similarly disliked model, the Triangle Borea BR03, which has a comparably inconsistent response.
Buy the Fosi Audio SP601 new; the KEF Q350 is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| KEF Q350 | Fosi Audio SP601 | |
|---|---|---|
| Price | $699.00 per pair Discontinued | $339.99 per pair |
| Ranked | #106 of 131 in Large Size Bookshelf Speakers | #113 of 131 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Audio Science Review) | 40Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 70Hz (measured, Audio Science Review) | 59Hz (measured, Erin’s Audio Corner) |
| Impedance | 4 ohms | 4 ohms nominal, 4.1 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 86dB (measured, Audio Science Review) | 85.4dB (measured, Erin’s Audio Corner) |
| Drivers | 25mm tweeter + 165mm woofer | 6.5” woofer, 1.5” Silk Dome Tweeters |
| Weight | 29.5 lbs (13.4 kg) | 11.5 lbs (5.2 kg) |
| Dimensions | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) | 14.5”H x 9.1”W x 14”D (368.3 x 231.1 x 355.6 mm) |
| Woofer Cabinet | ported, rear | ported, rear |
| Spinorama Preference Score | 5.25 (spinorama.org) | - |
| Spinorama Preference Score with Perfect Sub | 7.12 (spinorama.org) | - |
| DIY Kit | No | No |
| App | - | No |
| EQ | - | No |
| DSP | - | No |
| Power Handling | - | 80w RMS Per Speaker |
Related Speaker Comparisons
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- KEF Q Concerto Meta vs KEF Q350
- KEF Q350 vs MoFi SourcePoint 8
- Wharfedale Linton 85 vs KEF Q350
Prices on this page were last checked September 29, 2026 at 3:43 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
KEF Q350: $699.00 per pair Discontinued Amazon eBay
Newer model: the KEF Q3 Meta, ranked higher, rated 3.4/5.
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. Measured bass extension of 70Hz (-3dB), with a measured sensitivity of 86dB.
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) |
| DIY Kit | No |
| Dimensions | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) |
| Drivers | 25mm tweeter + 165mm woofer |
| Impedance | 4 ohms |
| Sensitivity | 86dB (measured, Audio Science Review) |
| Spinorama Preference Score | 5.25 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.12 (spinorama.org) |
| Weight | 29.5 lbs (13.4 kg) |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Fosi Audio SP601: $339.99 per pair Amazon Fosiaudio eBay
Pros: Two-way bookshelf design with a 6.5” paper/aluminum-alloy composite cone woofer and 1.5” silk dome tweeter. Bass reaches a respectable 60-70Hz in most rooms (F3 59Hz, F10 40Hz) for a budget bookshelf speaker. Distortion at 86dB and 96dB measures reasonably well at face value, and compression issues at extreme output are generally in line with what’s expected for a speaker at this price point. The overall tonal character can be substantially improved with basic EQ: the reviewer found a boost around 400Hz plus a cut around 4kHz brought it to an acceptable baseline. Measured bass extension of 59Hz (-3dB), with a measured sensitivity of 85.4dB.
Cons: An unusually erratic, up-and-down frequency response (a scooped midrange followed by an upper-mid bump, a dip, another small bump, then a strong 3-4dB peak around 4-7kHz) makes the speaker’s overall character genuinely hard to characterize: the reviewer compared the experience to a similarly disliked model, the Triangle Borea BR03, which has a comparably inconsistent response. The 4-7kHz peak gives a sharp, sibilant edge to S and T sounds in vocals. A strong diffraction dip around 4kHz followed by a peak can’t be fully corrected with EQ; the reviewer recommends sidewall absorption panels instead, since off-axis energy in the 2-7kHz range actually exceeds the direct sound reaching the listener. Multitone distortion becomes more noticeable and grainy at higher volumes, concentrated in the upper-midrange where hearing is most sensitive. A peaking distortion issue right at the crossover region suggests a possible combination of tweeter distortion and midwoofer/crossover-component strain. The enclosure sounds notably hollow when tapped, and a flashlight inspection suggested a lack of internal damping material, along with likely insufficient bracing. Vertical listening position is fairly tightly constrained around the tweeter axis. Still requires a subwoofer for real kick-drum impact and bass authority.
Full Fosi Audio SP601 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 59Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| DSP | No |
| Dimensions | 14.5”H x 9.1”W x 14”D (368.3 x 231.1 x 355.6 mm) |
| Drivers | 6.5” woofer, 1.5” Silk Dome Tweeters |
| EQ | No |
| Impedance | 4 ohms nominal, 4.1 ohms minimum (measured, Erin’s Audio Corner) |
| Power Handling | 80w RMS Per Speaker |
| Sensitivity | 85.4dB (measured, Erin’s Audio Corner) |
| Weight | 11.5 lbs (5.2 kg) |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons