Short answer: the KEF Q150. It ranks #26 of 87 bookshelf speakers by sound quality at $350; the PSB Imagine B50 ranks #30 and costs $1199, so there is not much of a tradeoff to weigh.
What the KEF Q150 offers: 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. 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. 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.
What the PSB Imagine B50 offers: The standmount sibling to PSB’s Imagine T65 tower, from PSB’s current 2023-refreshed Imagine line, using the same titanium-dome tweeter and woven-carbon-fiber woofer platform. Watch for: On-axis smoothness of just 0.235 and a deviation of 0.368dB are unremarkable for the price, with a +0.22dB per octave upward tilt giving it a brighter-leaning balance, a predicted in-room smoothness of just 0.35, and a Harman in-room bass extension estimate of only 49Hz. Current retail pricing ($1,199/pair) has risen well above the ~$700 figure recorded in the spinorama snapshot.
Buy the KEF Q150. It ranks higher for sound quality than the PSB Imagine B50 and costs less, so there is no real case for the other one.
Specifications Side By Side
| KEF Q150 | PSB Imagine B50 | |
|---|---|---|
| Price | $350 Discontinued | $1,199/pair |
| Ranked | #26 of 87 in Medium Size Bookshelf Speakers | #30 of 87 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | - |
| Dimensions | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) | 6.75W x 11.8H x 9.875D in |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal, 4 ohms minimum |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 85dB anechoic / 87dB in-room |
| Drivers | 130mm (5.25") aluminium Uni-Q woofer, 25mm (1") vented aluminium dome tweeter | 1" titanium dome tweeter (ferrofluid neodymium magnet), 5.25" woven carbon-fiber woofer |
| Discontinued | Yes | - |
| Weight | 12.3 lbs / 5.6 kg each | approx. 11.3 lbs each |
| Woofer Cabinet | ported, rear | - |
| Enclosure | - | 2-way, bass-reflex with rear slot port |
| Country | - | Canada (design) |
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- Revel M105 vs Polk Audio XT15
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- KEF Q150 vs Elac Carina BS243.4
- KEF Q150 vs Q Acoustics 5020
Prices on this page were last checked August 25, 2026 at 6:19 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 Discontinued Amazon eBay
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.
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) |
| Dimensions | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) |
| Discontinued | Yes |
| 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) |
| 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)
- Reddit Search for KEF Q150 Review
- Head-to-Head Comparisons
PSB Imagine B50: $1,199/pair PSB Speakers eBay
Pros: The standmount sibling to PSB’s Imagine T65 tower, from PSB’s current 2023-refreshed Imagine line, using the same titanium-dome tweeter and woven-carbon-fiber woofer platform.
Cons: On-axis smoothness of just 0.235 and a deviation of 0.368dB are unremarkable for the price, with a +0.22dB per octave upward tilt giving it a brighter-leaning balance, a predicted in-room smoothness of just 0.35, and a Harman in-room bass extension estimate of only 49Hz. Current retail pricing ($1,199/pair) has risen well above the ~$700 figure recorded in the spinorama snapshot.
Full PSB Imagine B50 review and specifications →
| Country | Canada (design) |
|---|---|
| Dimensions | 6.75W x 11.8H x 9.875D in |
| Drivers | 1" titanium dome tweeter (ferrofluid neodymium magnet), 5.25" woven carbon-fiber woofer |
| Enclosure | 2-way, bass-reflex with rear slot port |
| Impedance | 8 ohms nominal, 4 ohms minimum |
| Sensitivity | 85dB anechoic / 87dB in-room |
| Weight | approx. 11.3 lbs each |
- Links
- Reviews, Comparisons and Sound Samples