Short answer: the KEF LS50 Meta is the more accurate and immersive compact speaker, while the Acoustic Energy AE100 Mk2 is the lower-cost option with potentially EQ-friendly directivity. Both have small midwoofers and need a subwoofer for true full-range bass, though their measured extension is close at 68Hz and 63Hz respectively at -3dB.
AE100 Mk2 tracks reasonably well on and off axis, so its tonal errors can respond to EQ, and its wide horizontal radiation can create a spacious presentation. Its treble is too elevated in every tested placement, however. LS50 Meta has much better driver matching and measured directivity, but the 2-4kHz scoop and limited high-level bass output are its own real constraints.
Buy the KEF LS50 Meta for superior imaging, more controlled directivity, and a stronger measured platform for a premium small system.
Buy the Acoustic Energy AE100 Mk2 for a less expensive wide-dispersion speaker if you plan to use EQ or prefer a livelier treble balance.
Looking for alternatives? See the complete Passive Home rankings.
Measured Differences
- Tonal accuracy above the bass: with a subwoofer taking the low end, the KEF LS50 Meta scores 7.9 against 7.2 for the Acoustic Energy AE100 Mk2 on the Spinorama preference scale. Its frequency response and off-axis sound are smoother, so voices and instruments sound closer to the recording.
- Close enough not to matter: bass extension (43 Hz vs 42 Hz, 10 dB down).
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Specifications Side By Side
| KEF LS50 Meta | Acoustic Energy AE100 Mk2 | |
|---|---|---|
| Price | $1,199.00 per pair | $399 per pair Discontinued |
| Ranked | #4 of 179 in Medium Size Bookshelf Speakers | #119 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | 42Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 68Hz (measured, Erin’s Audio Corner) | 63Hz (measured, Erin’s Audio Corner) |
| Dimensions | 11.9”H x 7.9”W x 11”D (302 x 200 x 280.5 mm) | 11.4”H x 6.5”W x 9.8”D (290 x 165 x 250 mm) |
| Impedance | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 6 ohms nominal, 4.7 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 83dB (measured average, Erin’s Audio Corner; 85dB manufacturer specified) | 84dB (measured average, Erin’s Audio Corner) |
| Drivers | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter | 5.25” midwoofer, 1” soft fabric dome tweeter with waveguide |
| Weight | 17.2 lbs (7.8 kg) each | 20.1 lbs (9.1 kg) each |
| Woofer Cabinet | ported, rear | ported, rear slot port |
| Spinorama Preference Score | 5.74 | 4.96 |
| Spinorama Preference Score with Perfect Sub | 7.88 | 7.18 |
| DIY Kit | No | No |
| Crossover Frequency | - | 2.9kHz |
Where the Ratings Come From
- KEF LS50 Meta: Spinorama.org measurements and reviews by Erin’s Audio Corner, Audio Science Review and GR-Research.
- Acoustic Energy AE100 Mk2: Spinorama.org measurements and reviews by Erin’s Audio Corner.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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