Short answer: the ELAC Uni-Fi 2.0 UB52, if you are buying new, though neither ranks well in its class. The Acoustic Energy AE100 Mk2 ranks higher than it (#119 vs #144 of 179 bookshelf speakers, 2.9/5 vs 2.4/5) but is discontinued, so only consider it used; the ELAC Uni-Fi 2.0 UB52 is still sold new at $799. Both are rated below 3.0/5 among the 179 bookshelf speakers; for better sound, the Philharmonic Ceramic Mini ranks #2 at $900.
The Acoustic Energy AE100 Mk2 is the better-sounding choice. A nicely finished discontinued bookshelf speaker with wide dispersion and consistent off-axis sound that responds well to EQ. Watch for: High-frequency level runs noticeably too hot regardless of placement: the reviewer tried four different setups (near/far from wall, on-axis, 30° off-axis) at two listening distances and couldn’t get it to sound right at any of them.
The ELAC Uni-Fi 2.0 UB52 is the deeper-bass pick. A three-way bookshelf speaker with wide, smooth dispersion and more listening-height leeway than most. Its bass reaches about 55.7Hz before falling 3dB, against 63Hz for the Acoustic Energy AE100 Mk2. Watch for: Dipped 3db from 1.5-3kHz.
Buy the ELAC Uni-Fi 2.0 UB52 new; the Acoustic Energy AE100 Mk2 is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Passive Home rankings.
Measured Differences
- Close enough not to matter: bass extension (42 Hz vs 38.6 Hz, 10 dB down).
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Specifications Side By Side
| Acoustic Energy AE100 Mk2 | ELAC Uni-Fi 2.0 UB52 | |
|---|---|---|
| Price | $399 per pair Discontinued | $799.00 per pair |
| Ranked | #119 of 179 in Medium Size Bookshelf Speakers | #144 of 179 in Medium Size Bookshelf Speakers |
| Drivers | 5.25” midwoofer, 1” soft fabric dome tweeter with waveguide | 5.25” aluminum woofer, 4” aluminum midrange, 1” soft dome tweeter |
| Crossover Frequency | 2.9kHz | 200Hz / 2000Hz |
| Dimensions | 11.4”H x 6.5”W x 9.8”D (290 x 165 x 250 mm) | 13.6”H x 7.3”W x 10.8”D (346 x 185 x 275 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 7.7 lbs (3.5 kg) |
| Impedance | 6 ohms nominal, 4.7 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms |
| Sensitivity | 84dB (measured average, Erin’s Audio Corner) | 83.3dB (measured by Audio Science Review; 85dB manufacturer specified) |
| Bass Extension (-3dB) | 63Hz (measured, Erin’s Audio Corner) | 55.7Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 42Hz (measured, Erin’s Audio Corner) | 38.6Hz (measured, Audio Science Review) |
| Woofer Cabinet | ported, rear slot port | ported |
| Spinorama Preference Score | 4.96 | 5.32 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.18 | 7.34 (spinorama.org) |
| DIY Kit | No | No |
| Power Handling | - | 140W max |
Where the Ratings Come From
- Acoustic Energy AE100 Mk2: Spinorama.org measurements and reviews by Erin’s Audio Corner.
- ELAC Uni-Fi 2.0 UB52: Spinorama.org measurements and reviews by Audio Science Review.
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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