Short answer: the KEF LS50 Meta for better sound quality, the Boston Acoustics A25 for the lower price. The KEF LS50 Meta ranks #4 of 56 bookshelf speakers at $1599. The Boston Acoustics A25 ranks #22 at $299.98, $1299.02 cheaper.
What the KEF LS50 Meta gets right: Uni-Q concentric driver mounts a 1” vented aluminum dome tweeter at the center of a 5.25” aluminum cone woofer, rated 79Hz-20kHz+. The catch: F3 of 67Hz and F10 of 42Hz mean it doesn’t get much below 50Hz in-room; a subwoofer is recommended for real bass.
What the Boston Acoustics A25 offers: CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz - directivity is good enough that the response can be EQed and won’t be too room-dependent. Watch for: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip.
Buy the KEF LS50 Meta if sound quality matters more than the price. Buy the Boston Acoustics A25 if the price matters more than sound quality.
Specifications Side By Side
| KEF LS50 Meta | Boston Acoustics A25 | |
|---|---|---|
| Price | $1,599.00 | $299.98 Discontinued |
| Ranked | #4 of 56 in Medium Size Bookshelf Speakers | #22 of 56 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | 55Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 68Hz (measured, Erin’s Audio Corner) | 90Hz (measured, Audio Science Review) |
| Dimensions | 11.9"H x 7.9"W x 11"D (302 x 200 x 280.5 mm) | 10.7H x 7.25W x 8.9D in |
| Impedance | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal |
| Sensitivity | 83dB (measured average, Erin’s Audio Corner; 85dB manufacturer specified) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter | 1" Kortec soft dome tweeter, 5.25" ceramic/glass-fiber polymer mid/woofer |
| Weight | 17.2 lbs / 7.8 kg each | 10.1 lbs / 4.58 kg each |
| Woofer Cabinet | ported, rear | ported, rear |
| Discontinued | - | Yes |
| Frequency Response | - | 55Hz - 25kHz (Manufacturer specified) |
| Power Handling | - | 10-150W recommended |
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The Two Speakers In Full
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 |
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- 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
- Reddit Search for KEF LS50 Meta Review
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Boston Acoustics A25: $299.98 Discontinued
Pros: CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz - directivity is good enough that the response can be EQed and won’t be too room-dependent. Cabinet fit and finish is well above its price class, and dynamics were strong with no distortion audible even at high volume on well-recorded material. Discontinued, but the reviewer suggests hunting for clearance pricing on remaining stock.
Cons: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip. The rear port itself measured audibly distorted up close, though it wasn’t noticeable from normal listening distance in the reviewer’s room. Discontinued.
Full Boston Acoustics A25 review and specifications →
| Bass Extension (-10dB) | 55Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 90Hz (measured, Audio Science Review) |
| Dimensions | 10.7H x 7.25W x 8.9D in |
| Discontinued | Yes |
| Drivers | 1" Kortec soft dome tweeter, 5.25" ceramic/glass-fiber polymer mid/woofer |
| Frequency Response | 55Hz - 25kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Power Handling | 10-150W recommended |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Weight | 10.1 lbs / 4.58 kg each |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
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