Short answer: both are discontinued, so this only matters if you are buying used. Used, the KEF Q150 is the better pick: it ranks #48 of 168 bookshelf speakers by sound quality (rated 3.7/5), against #75 (rated 3.4/5) for the Dayton Audio MK402X. If you want one new, the KEF Q1 Meta replaces the KEF Q150 and is rated 3.6/5 at $399.99.
The KEF Q150 is the more accurate, deeper-bass choice. 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 4.01 for the Dayton Audio MK402X. Its bass reaches about 51Hz before falling 3dB, against 63Hz for the Dayton Audio MK402X. 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.
What the Dayton Audio MK402X does well: A compact, inexpensive 4-inch passive pair with an upgraded crossover over the original Dayton Audio MK402. The tradeoff: The response tilts bright at +0.20dB per octave and predicted in-room smoothness is a poor 0.18.
Buy the KEF Q150 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, buy the KEF Q1 Meta, which replaces the KEF Q150.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| KEF Q150 | Dayton Audio MK402X | |
|---|---|---|
| Price | $350 per pair Discontinued | $97.99 per pair Discontinued |
| Ranked | #48 of 168 in Medium Size Bookshelf Speakers | #75 of 168 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) | 63.0Hz (measured, spinorama.org) |
| Dimensions | 11.9”H x 7.1”W x 10.9”D (303 x 180 x 278 mm) | 9.5H x 5.75W x 6.5D in |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 84dB |
| Drivers | 130mm (5.25”) aluminium Uni-Q woofer, 25mm (1”) vented aluminium dome tweeter | 0.75” dome tweeter, 4” treated-paper woofer |
| Weight | 12.3 lbs (5.6 kg) each | approx. 5.1 lbs (2.3 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 4.86 | 4.01 |
| Spinorama Preference Score with Perfect Sub | 7.06 | 6.42 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, bass-reflex |
| Country | - | United States (design) |
Related Speaker Comparisons
How KEF Q150 compares with other leading options:
- KEF Q150 vs Audio First Fidelia
- KEF Q150 vs Philharmonic Ceramic Mini
- Ascend Sierra 1 v2 vs KEF Q150
- KEF LS50 Meta vs KEF Q150
- KEF Q150 vs Ascend Acoustics Luna V2 Mini-Monitor Ribbon
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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 MK402X: $97.99 per pair Discontinued Parts Express eBay
Older model: the Dayton Audio MK402 (ranked lower, estimated 3.2/5).
Same family: the Dayton Audio MK602X (larger bookshelf, rated 2.4/5).
Pros: A compact, inexpensive 4-inch passive pair with an upgraded crossover over the original Dayton Audio MK402. ASR measured good on-axis smoothness of 0.193, excellent sound-power smoothness of 0.125, broad horizontal coverage to about +/-60 degrees, and a very well-damped bass alignment Q of 0.24. Measured bass extension of 63.0Hz (-3dB).
Cons: The response tilts bright at +0.20dB per octave and predicted in-room smoothness is a poor 0.18. Estimated in-room extension is 52Hz, sensitivity is low for a passive speaker, and the 4-ohm impedance asks more of a small budget amplifier. Discontinued.
Full Dayton Audio MK402X review and specifications →
| Bass Extension (-10dB) | about 44.4Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 63.0Hz (measured, spinorama.org) |
| Country | United States (design) |
| DIY Kit | No |
| Dimensions | 9.5H x 5.75W x 6.5D in |
| Drivers | 0.75” dome tweeter, 4” treated-paper woofer |
| Enclosure | 2-way, bass-reflex |
| Impedance | 4 ohms |
| Sensitivity | 84dB |
| Spinorama Preference Score | 4.01 |
| Spinorama Preference Score with Perfect Sub | 6.42 |
| Weight | approx. 5.1 lbs (2.3 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons