Short answer: the PSB Alpha P5, if you are buying new. The KEF Q150 ranks higher than it (#49 vs #61 of 160 bookshelf speakers, 3.7/5 vs 3.6/5) but is discontinued, so only consider it used; the PSB Alpha P5 is still sold new at $549. The KEF Q150’s replacement, the KEF Q1 Meta, is rated 3.6/5.
The KEF Q150 is the more accurate, deeper-bass option. Two-way coaxial (Uni-Q) design with a 1” dome tweeter and 5.25” mid-range time-aligned in a single driver assembly, available in ported or sealed configuration. Its measured preference score, a predictor of how neutral it sounds, is 4.86 against 3.99 for the PSB Alpha P5. Its bass reaches about 51Hz before falling 3dB, against 58.6Hz for the PSB Alpha P5. Watch for: A high-frequency lift in the estimated in-room response makes it sound noticeably brighter in an untreated room than in a heavily acoustically-treated one: a real preference factor depending on your room’s furnishings.
Why pick the PSB Alpha P5: Well-behaved 5.25-inch bookshelf design with excellent 0.113 on-axis smoothness, a nearly flat +0.12dB/octave slope and broad roughly +/-60-degree horizontal coverage. The catch: Measured sensitivity is low at roughly 84dB, and the underdamped bass alignment (Q 0.42) trades some weight for control.
Buy the PSB Alpha P5 if you want one new; the KEF Q150 is discontinued, so only look for it used.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| KEF Q150 | PSB Alpha P5 | |
|---|---|---|
| Price | $350 per pair Discontinued | $549 per pair |
| Ranked | #49 of 160 in Medium Size Bookshelf Speakers | #61 of 160 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | about 44.4Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 58.6Hz (measured, ASR via spinorama.org) |
| Dimensions | 11.9”H x 7.1”W x 10.9”D (303 x 180 x 278 mm) | 11.4H x 6.7W x 9.5D in |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 87dB specified; about 84dB measured |
| Drivers | 130mm (5.25”) aluminium Uni-Q woofer, 25mm (1”) vented aluminium dome tweeter | 0.75” dome tweeter, 5.25” woofer |
| Weight | 12.3 lbs (5.6 kg) each | 10.1 lbs (4.6 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 4.86 | 3.99 |
| Spinorama Preference Score with Perfect Sub | 7.06 | 6.25 |
| DIY Kit | No | No |
| Enclosure | - | 2-way passive, rear-ported |
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Prices on this page were last checked October 9, 2026 at 8:01 AM 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
KEF Q150: $350 per pair Discontinued Amazon eBay
Newer model: the KEF Q1 Meta, ranked lower, rated 3.6/5.
Older model: the KEF Q100 (ranked lower, rated 2.4/5).
Same family: the KEF Q350 (larger bookshelf, rated 3/5), the KEF Q250c (smaller center, rated 3.9/5) and the KEF Q650c (larger center, rated 3.7/5).
Pros: Two-way coaxial (Uni-Q) design with a 1” dome tweeter and 5.25” mid-range time-aligned in a single driver assembly, available in ported or sealed configuration. Exceptional soundstage depth, a hallmark of KEF’s coaxial designs that the reviewer says few other speakers match. Bass extension reaches into kick-drum territory, respectable for a compact bookshelf speaker. Resonances present in measurements are consistent across on- and off-axis readings, meaning they can be effectively corrected with EQ. Distortion profile is essentially the same whether run sealed or ported, since a subwoofer crossover point sits above where the differences would matter anyway. At its sale price (around $300, sometimes seen at $400), the reviewer considers it a clear step up from his previous budget favorite in this range, the Emotiva B1+, mainly due to the superior soundstage depth. Measured bass extension of 51Hz (-3dB), with a measured sensitivity of 85dB.
Cons: A high-frequency lift in the estimated in-room response makes it sound noticeably brighter in an untreated room than in a heavily acoustically-treated one: a real preference factor depending on your room’s furnishings. A mild dip in the 1-2kHz region reduces vocal fullness somewhat. Unexplained resonances appear in measurements and persist in both sealed and ported configurations, pointing to enclosure or panel vibration rather than the port. Horizontal radiation is narrower than the reviewer generally prefers from KEF’s lineup, with directivity that widens somewhat around 1.2kHz (near a resonance) and again above about 5kHz. Compression testing at high output (102dB) shows significant nonlinearity, especially at lower frequencies: noticeably worse than a comparable Arendal bookshelf speaker costing over twice as much, which held up better until 80Hz. Not intended for loud listening without a subwoofer: the woofer will over-exert itself without a high-pass filter, and the reviewer recommends crossing over at 80-120Hz. At full retail price (around $600/pair), the value proposition is far less certain than at sale pricing. Discontinued.
Full KEF Q150 review and specifications →
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 11.9”H x 7.1”W x 10.9”D (303 x 180 x 278 mm) |
| Drivers | 130mm (5.25”) aluminium Uni-Q woofer, 25mm (1”) vented aluminium dome tweeter |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.86 |
| Spinorama Preference Score with Perfect Sub | 7.06 |
| Weight | 12.3 lbs (5.6 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Kef’s Cheapest Bookshelf. Is the Q150 worth your money? More from Erin’s Audio Corner →
- Erin’s Audio Corner Website KEF Q150
- GR-Research: KEF Q150… can it get any BETTER? More from GR-Research →
- Erin’s Audio Corner: 5 AWESOME SPEAKERS Under $1000 You Won’t Regret
- Erin’s Audio Corner: Budget Stereo Systems You Will Love
- Erin’s Audio Corner Measurements (spinorama.org)
- Head-to-Head Comparisons
PSB Alpha P5: $549 per pair PSB Speakers eBay
Same family: the PSB Alpha P3 (smaller bookshelf, ranked lower, rated 3.3/5), the PSB Alpha T20 (floorstanding, estimated 3.9/5) and the PSB Alpha C10 (center, estimated 3.4/5).
Pros: Well-behaved 5.25-inch bookshelf design with excellent 0.113 on-axis smoothness, a nearly flat +0.12dB/octave slope and broad roughly +/-60-degree horizontal coverage. ASR data predicts a 6.25 preference score with a subwoofer and 48Hz in-room extension. Measured bass extension of 58.6Hz (-3dB), with a measured sensitivity of 87dB.
Cons: Measured sensitivity is low at roughly 84dB, and the underdamped bass alignment (Q 0.42) trades some weight for control. Directivity-index consistency is middling at 3.67 and the raw no-subwoofer preference score is only 3.99.
Full PSB Alpha P5 review and specifications →
| Bass Extension (-10dB) | about 44.4Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 58.6Hz (measured, ASR via spinorama.org) |
| DIY Kit | No |
| Dimensions | 11.4H x 6.7W x 9.5D in |
| Drivers | 0.75” dome tweeter, 5.25” woofer |
| Enclosure | 2-way passive, rear-ported |
| Impedance | 8 ohms |
| Sensitivity | 87dB specified; about 84dB measured |
| Spinorama Preference Score | 3.99 |
| Spinorama Preference Score with Perfect Sub | 6.25 |
| Weight | 10.1 lbs (4.6 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons