Short answer: the KEF Q150. It ranks #26 of 87 bookshelf speakers by sound quality at $350; the Ascend Sierra Luna ranks #81 and costs $1176, 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 Ascend Sierra Luna offers: Ribbon tweeter and a dense, low-resonance bamboo cabinet give it well-controlled horizontal directivity, since the driver sizes blend together effectively. Solid build quality and impressive power handling for such a compact enclosure. Watch for: Dramatic peaks in the bass region around 400Hz, 800Hz, and 1.2kHz - Amir questioned, “A woofer doesn’t dance up and down so sharply by itself in a few hundred hertz?” The port resonates excessively, actually exceeding the woofer’s own output and creating problematic bass “horns.” Measured sensitivity of 80.9dB falls well short of the 83dB spec, requiring about 6dB more amplifier gain than typical speakers. Vertical directivity is poor, making tweeter-height listening position critical. Initial impressions were bright and fatiguing; even after aggressive EQ, Amir called the result “still a bit too bright but much more manageable” and could not recommend the speaker standalone.
Buy the KEF Q150. It ranks higher for sound quality than the Ascend Sierra Luna and costs less, so there is no real case for the other one.
If sound quality matters at all to you, skip the Ascend Sierra Luna. It ranks near the bottom of the 87 bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| KEF Q150 | Ascend Sierra Luna | |
|---|---|---|
| Price | $350 Discontinued | $1,176 discontinued, superseded by Luna V2 |
| Ranked | #26 of 87 in Medium Size Bookshelf Speakers | #81 of 87 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | 52.1Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 88.9Hz (measured, Audio Science Review) |
| Dimensions | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) | 10.5H x 5.75W x 6D in |
| 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) | 80.9dB (2.83V/1m, measured, Audio Science Review; 83dB manufacturer specified) |
| Drivers | 130mm (5.25") aluminium Uni-Q woofer, 25mm (1") vented aluminium dome tweeter | Custom RAAL true ribbon tweeter (10mm), 4.5" long-throw dual compliant CURV woofer |
| Discontinued | Yes | - |
| Weight | 12.3 lbs / 5.6 kg each | 9 lbs / 4.1 kg each |
| Woofer Cabinet | ported, rear | ported, front |
| Frequency Response | - | 60Hz - 27kHz (+/-3dB) (Manufacturer specified) |
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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
Ascend Sierra Luna: $1,176 discontinued, superseded by Luna V2 eBay
Pros: Ribbon tweeter and a dense, low-resonance bamboo cabinet give it well-controlled horizontal directivity, since the driver sizes blend together effectively. Solid build quality and impressive power handling for such a compact enclosure.
Cons: Dramatic peaks in the bass region around 400Hz, 800Hz, and 1.2kHz - Amir questioned, “A woofer doesn’t dance up and down so sharply by itself in a few hundred hertz?” The port resonates excessively, actually exceeding the woofer’s own output and creating problematic bass “horns.” Measured sensitivity of 80.9dB falls well short of the 83dB spec, requiring about 6dB more amplifier gain than typical speakers. Vertical directivity is poor, making tweeter-height listening position critical. Initial impressions were bright and fatiguing; even after aggressive EQ, Amir called the result “still a bit too bright but much more manageable” and could not recommend the speaker standalone.
Full Ascend Sierra Luna review and specifications →
| Bass Extension (-10dB) | 52.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 88.9Hz (measured, Audio Science Review) |
| Dimensions | 10.5H x 5.75W x 6D in |
| Drivers | Custom RAAL true ribbon tweeter (10mm), 4.5" long-throw dual compliant CURV woofer |
| Frequency Response | 60Hz - 27kHz (+/-3dB) (Manufacturer specified) |
| Sensitivity | 80.9dB (2.83V/1m, measured, Audio Science Review; 83dB manufacturer specified) |
| Weight | 9 lbs / 4.1 kg each |
| Woofer Cabinet | ported, front |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons