Short answer: the Dayton Audio OPAL1, if you are buying new. The KEF Q150 ranks higher than it (#48 vs #58 of 168 bookshelf speakers, 3.7/5 vs 3.6/5) but is discontinued, so only consider it used; the Dayton Audio OPAL1 is still sold new at $1,038.99. The KEF Q150’s replacement, the KEF Q1 Meta, is rated 3.6/5.
What the KEF Q150 does well: 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. The tradeoff: 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.
The case for the Dayton Audio OPAL1: A 2-way bookshelf speaker with a 5.25” mid-woofer (large surround) and a 1” dome tweeter, plus two passive radiators on the rear panel. Watch for: Measured average sensitivity is notably low at about 75.7dB (well under the 78dB spec) due to a nearly 3dB dip through the midrange, and the reviewer needed serious amplification (monoblock power amps, not just a compact streaming amp) to drive them to real listening levels for bass testing.
Buy the Dayton Audio OPAL1 new; the KEF Q150 is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| KEF Q150 | Dayton Audio OPAL1 | |
|---|---|---|
| Price | $350 per pair Discontinued | $1,038.99 per pair |
| Ranked | #48 of 168 in Medium Size Bookshelf Speakers | #58 of 168 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | 30Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 55Hz (measured, Erin’s Audio Corner) |
| Dimensions | 11.9”H x 7.1”W x 10.9”D (303 x 180 x 278 mm) | 14”H x 7”W x 9.5”D |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal (4.3 ohms minimum @ 4.4kHz, measured, Erin’s Audio Corner) |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 75.7dB (measured by Erin’s Audio Corner; 78dB manufacturer specified) |
| Drivers | 130mm (5.25”) aluminium Uni-Q woofer, 25mm (1”) vented aluminium dome tweeter | 5.25” mid-woofer, 1” dome tweeter, dual rear passive radiators |
| Weight | 12.3 lbs (5.6 kg) each | 20.7 lbs (9.4 kg) each |
| Woofer Cabinet | ported, rear | passive radiator, rear (dual) |
| Spinorama Preference Score | 4.86 | 5.08 |
| Spinorama Preference Score with Perfect Sub | 7.06 | 6.58 |
| DIY Kit | No | No |
| Frequency Response | - | 32Hz - 20kHz (-3dB, half-space, manufacturer specified) |
| Power Handling | - | 200W RMS (75-200W recommended amplifier power) |
| Crossover Frequency | - | 2,200Hz |
Related Speaker Comparisons
How KEF Q150 compares with other leading options:
- KEF Q150 vs Audio First Fidelia
- KEF Q150 vs Philharmonic Ceramic Mini
- Ascend Acoustics Sierra 1 v2 vs KEF Q150
- KEF LS50 Meta vs KEF Q150
- KEF Q150 vs Ascend Acoustics Luna V2 Mini-Monitor Ribbon
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). See every KEF Q Series generation.
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
Dayton Audio OPAL1: $1,038.99 per pair Dayton Audio eBay
Pros: A 2-way bookshelf speaker with a 5.25” mid-woofer (large surround) and a 1” dome tweeter, plus two passive radiators on the rear panel. A bass shelf in its response lets it sit closer to a wall than many speakers without sounding overly boomy, a similar design trait to the KEF R3 Meta. Measured F3 of about 55Hz and F10 of about 30Hz. Harmonic distortion is good for a 5.25” mid-woofer at both 86dB and 96dB output, and dynamic range/compression is reasonably well controlled up to about 96dB. Horizontal radiation of about ±60° lands right in the reviewer’s personally preferred range for soundstage width. On-axis, the sound is a little forward-leaning rather than dull, and EQ can bring back midrange fullness and a bigger sense of image spread if the stock tuning’s slightly recessed midrange isn’t to your taste. Measured bass extension of 55Hz (-3dB), with a measured sensitivity of 75.7dB.
Cons: Measured average sensitivity is notably low at about 75.7dB (well under the 78dB spec) due to a nearly 3dB dip through the midrange, and the reviewer needed serious amplification (monoblock power amps, not just a compact streaming amp) to drive them to real listening levels for bass testing. On-axis response is within only about ±3dB (a 6dB window) (not very linear) with a mid-range scoop and a bump around 1kHz that makes the sound a bit forward and less full than a neutral reference; EQ can address most of this but makes the image slightly more diffuse in exchange for added fullness. A roughly one-octave-wide diffraction dip between 3-5kHz can’t be corrected with EQ, since boosting it raises reflected energy in a band that’s already elevated off-axis. Top end rolls off fairly quickly above about 10kHz on-axis, and toeing the speakers out more than about 10° loses noticeable air and cymbal/hi-hat detail: best kept close to on-axis. Multitone distortion jumps substantially between 87dB and 96dB SPL/1m, so headroom for loud listening is limited. Vertical window is tight at about ±20°.
Full Dayton Audio OPAL1 review and specifications →
| Bass Extension (-10dB) | 30Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 2,200Hz |
| DIY Kit | No |
| Dimensions | 14”H x 7”W x 9.5”D |
| Drivers | 5.25” mid-woofer, 1” dome tweeter, dual rear passive radiators |
| Frequency Response | 32Hz - 20kHz (-3dB, half-space, manufacturer specified) |
| Impedance | 8 ohms nominal (4.3 ohms minimum @ 4.4kHz, measured, Erin’s Audio Corner) |
| Power Handling | 200W RMS (75-200W recommended amplifier power) |
| Sensitivity | 75.7dB (measured by Erin’s Audio Corner; 78dB manufacturer specified) |
| Spinorama Preference Score | 5.08 |
| Spinorama Preference Score with Perfect Sub | 6.58 |
| Weight | 20.7 lbs (9.4 kg) each |
| Woofer Cabinet | passive radiator, rear (dual) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons