Short answer: the JBL XPL-90 for on-axis flatness, the KEF Q350 for off-axis consistency. The Q350’s coaxial Uni-Q driver gives it excellent directivity and a reasonably flat on-axis response, but two resonances at 700Hz and 1.2kHz show up on-axis along with an upper-bass boost. The XPL-90 is nearly ruler-flat to 1kHz with even horizontal directivity until it beams above 10kHz, though it peaks around 3kHz and needs its tweeter at ear level.
Buy the JBL XPL-90 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the AsciLab C6B instead.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| JBL XPL-90 | KEF Q350 | |
|---|---|---|
| Price | $1,298 per pair used (vintage, late 1980s), Discontinued | $699.00 per pair Discontinued |
| Ranked | #104 of 134 in Large Size Bookshelf Speakers | #109 of 134 in Large Size Bookshelf Speakers |
| Drivers | 6.5” bass/mid driver, 1” titanium dome tweeter | 25mm tweeter + 165mm woofer |
| Dimensions | 15.5”H x 9.5”W x 9.8”D (394 x 241 x 248 mm) | 14.1”H x 8.3”W x 12”D (358.0 x 210.0 x 306.0 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 29.5 lbs (13.4 kg) |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) | 86dB (measured, Audio Science Review) |
| Impedance | 6 ohms | 4 ohms |
| Power Handling | 100W nominal, 400W max | - |
| Bass Extension (-3dB) | 77.6Hz (measured, Audio Science Review) | 70Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 48.7Hz (measured, Audio Science Review) | 38Hz (measured, Audio Science Review) |
| Spinorama Preference Score | 3.7 (spinorama.org) | 5.25 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 6.31 (spinorama.org) | 7.12 (spinorama.org) |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
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More worthwhile head-to-heads for JBL XPL-90:
- KEF R3 Meta vs JBL XPL-90
- KEF Q Concerto Meta vs JBL XPL-90
- MoFi SourcePoint 8 vs JBL XPL-90
- Wharfedale Linton 85 vs JBL XPL-90
- ELAC Debut 3.0 DB63 vs JBL XPL-90
Prices on this page were last checked October 2, 2026 at 10:18 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
JBL XPL-90: $1,298 per pair used (vintage, late 1980s) Discontinued eBay
Pros: Nearly ruler-flat on-axis response up to 1kHz with even horizontal directivity until the tweeter beams above 10kHz. The reviewer found real strength with vocals and simpler instrumentation, calling it “the first speaker I have liked that has some clear response errors” and “an enjoyable speaker” despite the flaws. Titanium tweeter and internal Monster cable wiring reflect JBL’s higher-end late-1980s engineering. Measured bass extension of 77.6Hz (-3dB), with a measured sensitivity of 85dB.
Cons: Crossover region peaking around 3kHz and treble peaking above 10kHz color the top end, and poor vertical directivity means the tweeter needs to be at ear level. Distortion rises at 96dB SPL, especially around 3kHz. Long discontinued; only available on the used market.
Full JBL XPL-90 review and specifications →
| Bass Extension (-10dB) | 48.7Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 77.6Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 15.5”H x 9.5”W x 9.8”D (394 x 241 x 248 mm) |
| Drivers | 6.5” bass/mid driver, 1” titanium dome tweeter |
| Impedance | 6 ohms |
| Power Handling | 100W nominal, 400W max |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 3.7 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 6.31 (spinorama.org) |
| Weight | 20.1 lbs (9.1 kg) each |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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 |
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- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons