Short answer: the KEF LS50 Meta for the higher ranking, the Zaph Audio ZA5.2 TM for the lower price. The KEF LS50 Meta ranks #3 of 21 bookshelf speakers at $1599. The Zaph Audio ZA5.2 TM ranks #6 at $383, $1216 cheaper.
On the KEF LS50 Meta side: 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.
The case for the Zaph Audio ZA5.2 TM: CEA2034 spinorama shows a fairly smooth on-axis response. Set against that: Predicted in-room response is tilted upward toward the treble, which the reviewer flagged as a likely audible brightness.
Buy the KEF LS50 Meta if the ranking matters more than the price. Buy the Zaph Audio ZA5.2 TM if the price matters more than the ranking.
Specifications Side By Side
| KEF LS50 Meta | Zaph Audio ZA5.2 TM | |
|---|---|---|
| Price | $1,599.00 | $383 |
| Ranked | #3 of 21 in Medium Size Bookshelf Speakers | #6 of 21 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz | 40Hz |
| Bass Extension (-3dB) | 68Hz | 60Hz |
| Dimensions | 11.9"H x 7.9"W x 11.1"D (302 x 200 x 280.5 mm) | 14"H x 8"W x 9.5"D (355.6 x 203.2 x 241.3 mm) |
| Impedance | 8 ohms | 8 ohms |
| Sensitivity | 85dB | 82dB |
| Drivers | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter | 5" ZA14W08 aluminum cone woofer, 1" DQ25SC16-04 titanium dome tweeter |
| Weight | 17.2 lbs / 7.8 kg each | 9.3 lbs / 4.2 kg |
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.
| Bass Extension (-10dB) | 43Hz |
|---|---|
| Bass Extension (-3dB) | 68Hz |
| Dimensions | 11.9"H x 7.9"W x 11.1"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 |
| Sensitivity | 85dB |
| Weight | 17.2 lbs / 7.8 kg each |
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Zaph Audio ZA5.2 TM: $383 Madisoundspeakerstore
Pros: CEA2034 spinorama shows a fairly smooth on-axis response. Cumulative spectral decay (waterfall) is clean overall, with only minor lingering energy around 400-700Hz.
Cons: Predicted in-room response is tilted upward toward the treble, which the reviewer flagged as a likely audible brightness. Low sensitivity of about 82dB requires more amplifier gain than typical. Relative harmonic distortion is excessive in the low frequencies, climbing to 6-8% under a 10-volt test signal in the 60-150Hz region - notably worse than typical two-way designs in this price range. Impedance runs close to 7 ohms through much of the audible range, with additional peaks that make it a moderately demanding load for a low-sensitivity design. Vertical directivity narrows unevenly above about 1kHz, typical of this MTM-adjacent tweeter/woofer spacing.
| Bass Extension (-10dB) | 40Hz |
|---|---|
| Bass Extension (-3dB) | 60Hz |
| Dimensions | 14"H x 8"W x 9.5"D (355.6 x 203.2 x 241.3 mm) |
| Drivers | 5" ZA14W08 aluminum cone woofer, 1" DQ25SC16-04 titanium dome tweeter |
| Impedance | 8 ohms |
| Sensitivity | 82dB |
| Weight | 9.3 lbs / 4.2 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.