Short answer: the KEF Q350 for better sound quality, the Fosi Audio SP601 for the lower price. The KEF Q350 ranks #70 of 84 bookshelf speakers at $699. The Fosi Audio SP601 ranks #75 at $399.99, $299.01 cheaper.
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.
What the Fosi Audio SP601 offers: Two-way bookshelf design with a 6.5” paper/aluminum-alloy composite cone woofer and 1.5” silk dome tweeter. Watch for: 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…
Buy the KEF Q350 if sound quality matters more than the price. Buy the Fosi Audio SP601 if the price matters more than sound quality.
If sound quality matters at all to you, skip both of these and look higher up the 84 bookshelf speakers instead.
Specifications Side By Side
| KEF Q350 | Fosi Audio SP601 | |
|---|---|---|
| Price | $699.00 Discontinued | $399.99 |
| Ranked | #70 of 84 in Large Size Bookshelf Speakers | #75 of 84 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 |
| Discontinued | Yes | - |
| 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 |
| App | - | No |
| Bluetooth | - | No |
| EQ | - | No |
| DSP | - | No |
| Output Power | - | 80w RMS Per Speaker |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Triangle Borea BR03 vs Yamaha NS-10
- Klipsch RP-600M vs Triangle Borea BR03
- Aperion Audio Verus V8B vs HSU Research CCB-8
- ELAC DB63 vs Fosi Audio SP601
- KEF Q350 vs HSU Research CCB-8
The Two Speakers In Full
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 |
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Fosi Audio SP601: $399.99 Amazon Fosiaudio
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.
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) |
| Bluetooth | 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) |
| Output Power | 80w RMS Per Speaker |
| Sensitivity | 85.4dB (measured, Erin's Audio Corner) |
| Weight | 11.5 lbs / 5.2 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