Short answer: the SVS Prime Bookshelf ranks #84 of 122 bookshelf speakers by sound quality at $699; the KEF Q350 ranks #98 at $699. Close enough in price that the sound-quality gap is the deciding factor.
What the SVS Prime Bookshelf offers: 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. 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. 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.
What the KEF Q350 offers: 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. Watch for: 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.
Buy the SVS Prime Bookshelf. It ranks higher for sound quality than the KEF Q350 at the same price, so there is no real case for the other one.
If sound quality matters at all to you, skip the KEF Q350. It ranks near the bottom of the 122 bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| SVS Prime Bookshelf | KEF Q350 | |
|---|---|---|
| Price | $699.00 | $699.00 Discontinued |
| Ranked | #84 of 122 in Large Size Bookshelf Speakers | #98 of 122 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 (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) | - |
| Discontinued | - | Yes |
| Dimensions | - | 14.1"H x 8.3"W x 12"D (358.0 x 210.0 x 306.0 mm) |
| Woofer Cabinet | - | ported, rear |
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- JBL Studio 630 vs SVS Prime Bookshelf
- JBL Studio 630 vs KEF Q350
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The Two Speakers In Full
SVS Prime Bookshelf: $699.00 Amazon eBay
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.
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) |
| 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) |
| Weight | 15.5 lbs (15.5 lbs / 7.03 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: SVS Prime Bookshelf Truthful & Technical Review More from Erin’s Audio Corner →
- Erin’s Audio Corner: SVS Prime vs Ultra Bookshelf. Why Spend More?
- Erin’s Audio Corner Website: SVS Prime Bookshelf
- Erin’s Audio Corner Measurements (spinorama.org)
- Reddit Search for SVS Prime Bookshelf Review
- Head-to-Head Comparisons
- SVS Prime Bookshelf vs KEF Q3 Meta
- SVS Prime Bookshelf vs ELAC Debut 2.0 B6.2
- SVS Prime Bookshelf vs Polk Monitor XT20
- SVS Prime Bookshelf vs Dynaudio Special Forty
- SVS Prime Bookshelf vs Sonus Faber Lumina II
- SVS Prime Bookshelf vs Focal Aria 906
- SVS Prime Bookshelf vs Infinity IL10
- SVS Prime Bookshelf vs Revel Performa M22
- See all 23 comparisons
KEF Q350: $699.00 Discontinued Amazon eBay
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 |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons