Short answer: the KEF LS50 Meta for better sound quality, the Ascend Acoustics Luna V2 Mini-Monitor Ribbon for the lower price. The KEF LS50 Meta ranks #4 of 63 bookshelf speakers at $1599. The Ascend Acoustics Luna V2 Mini-Monitor Ribbon ranks #5 at $1248, $351 cheaper.
What the Ascend Acoustics Luna V2 Mini-Monitor Ribbon offers: The same compact V-LAM bamboo cabinet and proprietary 4.5 inch glass fiber woofer as the Titan dome version, upgraded with a custom RAAL true ribbon tweeter that has roughly 1/50th the moving mass of a dome for faster transient response and more top end air. Watch for: On axis deviation still measures 0.573dB average, nearly as rough as the Titan dome version’s 0.599, so the ribbon upgrade mainly helps directivity consistency and top end extension rather than fixing on axis evenness.
The case for the KEF LS50 Meta: Uni-Q concentric driver mounts a 1” vented aluminum dome tweeter at the center of a 5.25” aluminum cone woofer, rated 79Hz-20kHz+. Set against that: F3 of 67Hz and F10 of 42Hz mean it doesn’t get much below 50Hz in-room; a subwoofer is recommended for real bass.
Buy the Ascend Acoustics Luna V2 Mini-Monitor Ribbon if the price matters more than sound quality. Buy the KEF LS50 Meta if sound quality matters more than the price.
Specifications Side By Side
| Ascend Acoustics Luna V2 Mini-Monitor Ribbon | KEF LS50 Meta | |
|---|---|---|
| Price | $1,248/pair | $1,599.00 |
| Ranked | #5 of 63 in Medium Size Bookshelf Speakers | #4 of 63 in Medium Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | Custom RAAL 10mm true ribbon tweeter, 4.5" long throw glass fiber cone woofer | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter |
| Dimensions | 10.6"H x 5.7"W x 6"D (270 x 146 x 152 mm) (10.625 x 5.75 x 6.0 in) | 11.9"H x 7.9"W x 11"D (302 x 200 x 280.5 mm) |
| Weight | 8.3 lbs / 3.75 kg (8.25 lbs) each | 17.2 lbs / 7.8 kg each |
| Sensitivity | 82dB @ 2.83V/1m anechoic (manufacturer) | 83dB (measured average, Erin’s Audio Corner; 85dB manufacturer specified) |
| Impedance | 8 ohms nominal | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Power Output (Watts) | 100W continuous, 150W peak | - |
| Frequency Response | 75-27,000Hz +/-3dB anechoic (manufacturer) | - |
| Bass Extension (-3dB) | 74.7Hz (measured, spinorama.org vendor data) | 68Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 44.3Hz (measured, spinorama.org vendor data) | 43Hz (measured, Erin’s Audio Corner) |
| Warranty | 7 years parts and labor | - |
| Country | United States | - |
| Woofer Cabinet | - | ported, rear |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Ascend Sierra 1 v2 vs Wharfedale Super Denton
- Ascend Sierra 1 v2 vs Q Acoustics 5020
- Arendal 1961 Monitor vs Ascend Sierra 1 v2
- KEF LS50 Meta vs Q Acoustics 5020
- Arendal 1961 Monitor vs KEF LS50 Meta
The Two Speakers In Full
Ascend Acoustics Luna V2 Mini-Monitor Ribbon: $1,248/pair Ascend Acoustics
Pros: The same compact V-LAM bamboo cabinet and proprietary 4.5 inch glass fiber woofer as the Titan dome version, upgraded with a custom RAAL true ribbon tweeter that has roughly 1/50th the moving mass of a dome for faster transient response and more top end air. The sound power directivity index has a standard deviation of just 2.88, the tightest of any speaker added to this catalog from spinorama.org’s current measurement set, a real directivity benefit from the ribbon over the dome tweeter’s 3.14. Same 7 year warranty and hand matched pairs as the rest of Ascend’s lineup.
Cons: On axis deviation still measures 0.573dB average, nearly as rough as the Titan dome version’s 0.599, so the ribbon upgrade mainly helps directivity consistency and top end extension rather than fixing on axis evenness. Costs about 39 percent more than the Titan dome version of this exact cabinet for what measures as very similar bass extension and sensitivity. Bass extension is still limited to a measured 74.7Hz at -3dB by the small woofer, and Ascend sells direct only with no dealer network for an in person audition.
Full Ascend Acoustics Luna V2 Mini-Monitor Ribbon review and specifications →
| Bass Extension (-10dB) | 44.3Hz (measured, spinorama.org vendor data) |
|---|---|
| Bass Extension (-3dB) | 74.7Hz (measured, spinorama.org vendor data) |
| Country | United States |
| Dimensions | 10.6"H x 5.7"W x 6"D (270 x 146 x 152 mm) (10.625 x 5.75 x 6.0 in) |
| Drivers | Custom RAAL 10mm true ribbon tweeter, 4.5" long throw glass fiber cone woofer |
| Enclosure | ported |
| Frequency Response | 75-27,000Hz +/-3dB anechoic (manufacturer) |
| Impedance | 8 ohms nominal |
| Power Output (Watts) | 100W continuous, 150W peak |
| Sensitivity | 82dB @ 2.83V/1m anechoic (manufacturer) |
| Warranty | 7 years parts and labor |
| Weight | 8.3 lbs / 3.75 kg (8.25 lbs) each |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
KEF LS50 Meta: $1,599.00 Amazon Crutchfield
Pros: Uni-Q concentric driver mounts a 1” vented aluminum dome tweeter at the center of a 5.25” aluminum cone woofer, rated 79Hz-20kHz+. Speaker-to-speaker matching measured tight at roughly 0.5dB deviation between the pair tested, versus 2-3dB seen on some other speakers - likely why imaging stayed so precise. Imaging stays tight and focused even toed out, unlike most coincident designs where toe-out typically diffuses the image, giving more of an oval-shaped soundstage than a hard rectangular boundary. Horizontal and vertical directivity both hold to about ±50° at the -6dB point, so tonality stays consistent across roughly a 100° listening cone. The extended bass shelf is deliberately tuned for near-wall/boundary placement rather than the usual “pull it 3 feet into the room” advice, playing lower without excess boominess when placed close to a wall. At $1,000 (a frequent sale price versus $1,600 list), called a no-brainer for a compact stand-mount speaker. Independent ASR Klippel measurements corroborate this: very good directivity with the on- and off-axis curves tracking closely, and a predicted in-room response the reviewer called “very close to ideal.”
Cons: F3 of 67Hz and F10 of 42Hz mean it doesn’t get much below 50Hz in-room; a subwoofer is recommended for real bass. A 2-3dB scoop around 2-4kHz shows up in both the listening window and sound power measurements, matching a subjectively noticed lack of attack and vocal clarity that the reviewer wanted to correct with about 2dB of EQ. An on-axis diffraction dip around 8kHz smooths out with about 15° of toe-out (typical for concentric designs, but still present at 0°). Distortion is elevated at low frequencies since the single 5.25” cone shares surface area with the tweeter housing, reducing effective radiating area; multitone distortion crosses the 3% threshold at 96dB/1m, making roughly 88dB or below the safer output ceiling. Moderate sensitivity (~83dB average) needed 2-3dB more amplifier gain than typical in testing. Adding a subwoofer at an 80Hz crossover only helps lower-midrange distortion, not the elevated distortion in the 1-2kHz and above-5kHz regions. ASR’s own Klippel testing found the same pattern in starker terms: THD is very good at 86dB SPL/1m but climbs past 100% in the bass at 96dB SPL/1m, confirming this is not a near-field speaker for high-output bass-heavy material. Cumulative spectral decay (waterfall) also shows a couple of resonances lingering in the 1-2kHz region.
Full KEF LS50 Meta review and specifications →
| Bass Extension (-10dB) | 43Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 68Hz (measured, Erin's Audio Corner) |
| Dimensions | 11.9"H x 7.9"W x 11"D (302 x 200 x 280.5 mm) |
| Drivers | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter |
| Impedance | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin's Audio Corner) |
| Sensitivity | 83dB (measured average, Erin's Audio Corner; 85dB manufacturer specified) |
| Weight | 17.2 lbs / 7.8 kg each |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Unveiling the KEF LS50 Meta: The Truth Behind the Hype
- Erin’s Audio Corner Website KEF LS50 Meta
- Audio Science Review KEF LS50 Meta
- GR-Research: KEF LS50 Meta! Worthy of HYPE?
- Erin’s Audio Corner: My Top Picks of 2023: Must-Haves Under $3000
- Erin’s Audio Corner Measurements (spinorama.org)
- Reddit Search for KEF LS50 Meta Review
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