Short answer: the SVS Prime Bookshelf. It ranks #137 of 203 bookshelf speakers by sound quality (rated 3.5/5) at $699 and is still sold new; the KEF Q350 ranks #171 (rated 3.0/5) and is discontinued, so it is only an option used. The KEF Q350’s replacement, the KEF Q3 Meta, is rated 3.4/5.
The SVS Prime Bookshelf is the better-sounding choice. Reasonable sensitivity for the price at about 87dB, and the 6.5” woofer sits in its own dedicated sealed sub-compartment inside the cabinet for cleaner midrange/bass separation. Watch for: A scooped mid-range paired with a boosted upper mid-range creates an audibly uneven tonal balance, and there’s an additional dip in the treble around 4-5kHz that reads as slightly tinny relative to the recessed mid-range.
What the KEF Q350 does well: 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 SVS Prime Bookshelf. It is rated higher for sound quality, and the KEF Q350 is discontinued, so it is only available used.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| SVS Prime Bookshelf | KEF Q350 | |
|---|---|---|
| Price | $699.00 per pair | $699.00 per pair Discontinued |
| Ranked | #137 of 203 in Large Size Bookshelf Speakers | #171 of 203 in Large Size Bookshelf Speakers |
| Drivers | 6.5” polypropylene cone woofer with aluminum shorting ring (sealed sub-compartment), 1” aluminum dome tweeter | 25mm tweeter + 165mm woofer |
| Weight | 15.5 lbs (7.03 kg) each | 29.5 lbs (13.4 kg) |
| Impedance | 8 ohms nominal, 3.9 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms |
| Sensitivity | 87dB (measured average, Erin’s Audio Corner) | 86dB (measured, Audio Science Review) |
| Bass Extension (-3dB) | 72Hz (measured, Erin’s Audio Corner) | 70Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 49Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Audio Science Review) |
| Frequency Response | 48Hz - 25kHz ±3dB (manufacturer specified) | - |
| Spinorama Preference Score | 5.17 | 5.25 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.78 | 7.12 (spinorama.org) |
| Dimensions | 13.2”H x 8”W x 10.2”D (335.3 x 203.2 x 259.1 mm) | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
Related Speaker Comparisons
More worthwhile head-to-heads for SVS Prime Bookshelf:
- SVS Prime Bookshelf vs Perlisten S4b
- KEF Reference 1 Meta vs SVS Prime Bookshelf
- SVS Prime Bookshelf vs GR-Research NX-Studio
- AsciLab C6B vs SVS Prime Bookshelf
- Audio First Cadentia 3 vs SVS Prime Bookshelf
Prices on this page were last checked October 7, 2026 at 9:25 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.
The Two Speakers In Full
SVS Prime Bookshelf: $699.00 per pair Amazon eBay
Same family: the SVS Prime Satellite (smaller bookshelf, estimated 3.3/5), the SVS Prime Tower (smaller floorstanding, estimated 3.6/5), the SVS Prime Pinnacle (larger floorstanding, estimated 3.8/5) and the SVS Prime Center (center, rated 3.4/5).
Pros: Reasonable sensitivity for the price at about 87dB, and the 6.5” woofer sits in its own dedicated sealed sub-compartment inside the cabinet for cleaner midrange/bass separation. Overall response stays within about ±3dB from 80Hz-16kHz, which the reviewer calls reasonable for the price point. Wide, consistent horizontal radiation. Toeing the speakers 30 degrees off-axis smooths the in-room response noticeably if the on-axis tonal balance isn’t to your taste. Measured bass extension of 72Hz (-3dB), with a measured sensitivity of 87dB.
Cons: A scooped mid-range paired with a boosted upper mid-range creates an audibly uneven tonal balance, and there’s an additional dip in the treble around 4-5kHz that reads as slightly tinny relative to the recessed mid-range. Measured minimum impedance dips below 4 ohms (EPDR even lower), so an 8-ohm-only amplifier or AVR may struggle: a 4-ohm-stable amp or separate amplification is recommended. Bass extension is modest (F3 72Hz, F10 49Hz measured): SVS clearly designed this to be paired with one of their subwoofers rather than to stand fully alone. Compared directly against its pricier sibling, the SVS Ultra Bookshelf, in the same review, the reviewer found the Ultra noticeably more tonally neutral.
Full SVS Prime Bookshelf review and specifications →
| Bass Extension (-10dB) | 49Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 72Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 13.2”H x 8”W x 10.2”D (335.3 x 203.2 x 259.1 mm) |
| Drivers | 6.5” polypropylene cone woofer with aluminum shorting ring (sealed sub-compartment), 1” aluminum dome tweeter |
| Frequency Response | 48Hz - 25kHz ±3dB (manufacturer specified) |
| Impedance | 8 ohms nominal, 3.9 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 87dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.17 |
| Spinorama Preference Score with Perfect Sub | 7.78 |
| Weight | 15.5 lbs (7.03 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- SVS Prime Bookshelf vs ELAC Debut 2.0 B6.2
- SVS Prime Bookshelf vs Dynaudio Special Forty
- SVS Prime Bookshelf vs Infinity IL10
- SVS Prime Bookshelf vs GR-Research X-LS Encore
- SVS Prime Bookshelf vs KEF Q3 Meta
- SVS Prime Bookshelf vs Polk Monitor XT20
- SVS Prime Bookshelf vs Sonus Faber Lumina II
- SVS Prime Bookshelf vs XTZ Spirit 4
- See all 57 comparisons
KEF Q350: $699.00 per pair Discontinued Amazon eBay
Newer model: the KEF Q3 Meta, ranked higher, rated 3.4/5.
Same family: the KEF Q150 (smaller bookshelf, rated 3.7/5), the KEF Q250c (smaller center, rated 3.9/5) and the KEF Q650c (larger center, rated 3.7/5).
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