Short answer: the KEF Q3 Meta, if you are buying new. The KEF Q350 ranks higher than the Fosi Audio SP601 (#187 vs #201 of 222 bookshelf speakers) but is discontinued; its replacement, the KEF Q3 Meta, is rated 3.4/5 at $899.99 and is still sold new.
Why pick the KEF Q350: A discontinued KEF bookshelf speaker with a coaxial Uni-Q driver for consistent sound across a wide listening area. Watch for: Two resonances at 700Hz and 1.2kHz show up on-axis, alongside an upper-bass boost.
The Fosi Audio SP601 is the deeper-bass choice. A budget bookshelf speaker with a 6.5 inch woofer and respectable bass that improves noticeably with simple EQ. Its bass reaches about 59Hz before falling 3dB, against 70Hz for the KEF Q350. The tradeoff: 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 KEF Q3 Meta, the replacement for the discontinued KEF Q350; it is rated higher for sound quality than the Fosi Audio SP601.
Still deciding? The full Passive Home rankings cover every ranked option.
Measured Differences
- Close enough not to matter: bass extension (38 Hz vs 40 Hz, 10 dB down).
Prices on this page were last checked November 14, 2026 at 6:17 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| KEF Q350 | Fosi Audio SP601 | |
|---|---|---|
| Price | $699.00 per pair Discontinued | $399.99 per pair |
| Ranked | #187 of 222 in Large Size Bookshelf Speakers | #201 of 222 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 |
Where the Ratings Come From
- KEF Q350: Spinorama.org measurements and reviews by Audio Science Review.
- Fosi Audio SP601: reviews by Erin’s Audio Corner and Audio Science Review Fosi Audio SP60.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
Related Speaker Comparisons
More top alternatives to KEF Q350: