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 (#59 vs #68 of 88 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 $599. Both are rated below 3.0/5 among the 88 bookshelf speakers; for better sound, the Ascend Acoustics HTM-200SE2 ranks #7 at $368.
The case for the Acoustic Energy AE100 Mk2: Good directivity linearity: on-axis and off-axis response track each other well despite an otherwise uneven overall response, which means the tonal problems can be EQ’d out with reasonably good success. 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 case for the ELAC Uni-Fi 2.0 UB52: Wide, smooth horizontal directivity: beamwidth holds to about ±60 degrees up to 8kHz before narrowing. 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.
Specifications Side By Side
| Acoustic Energy AE100 Mk2 | ELAC Uni-Fi 2.0 UB52 | |
|---|---|---|
| Price | $399 per pair Discontinued | $599.00 per pair |
| Ranked | #59 of 88 in Medium Size Bookshelf Speakers | #68 of 88 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 |
Related Speaker Comparisons
How Acoustic Energy AE100 Mk2 compares with other leading options:
- Ascend Sierra 1 v2 vs Acoustic Energy AE100 Mk2
- KEF LS50 Meta vs Acoustic Energy AE100 Mk2
- Arendal 1961 Monitor vs Acoustic Energy AE100 Mk2
- KEF Q150 vs Acoustic Energy AE100 Mk2
- ELAC BS U5 vs Acoustic Energy AE100 Mk2
Prices on this page were last checked September 30, 2026 at 2:57 PM UTC. Product prices and availability are accurate as of that date/time 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.
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The Two Speakers In Full
Acoustic Energy AE100 Mk2: $399 per pair Discontinued Amazon eBay
Pros: Good directivity linearity: on-axis and off-axis response track each other well despite an otherwise uneven overall response, which means the tonal problems can be EQ’d out with reasonably good success. Wide horizontal radiation, about ±50°. Nicely finished cabinet: the reviewer specifically called out the fit and finish as a genuine positive. Both units of the review pair measured closely matched to each other. Measured bass extension of 63Hz (-3dB), with a measured sensitivity of 84dB.
Cons: 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. A mid-range dip that the reviewer attributes to internal cabinet resonance rather than intentional baffle-step compensation, reinforced by an internal inspection showing no cross-bracing and a slot port that may itself be resonating when tapped. Small tweeter waveguide magnet suggests limited power handling headroom. At this price and radiation pattern, the reviewer would pick the ELAC DBR62 (more neutral, similar ±60° pattern) or, for less money, the ELAC Debut 2.0 B6.2 over this speaker; the KEF Q150 and SVS Prime Bookshelf are also called out as more linear alternatives nearby in price. Discontinued.
Full Acoustic Energy AE100 Mk2 review and specifications →
| Bass Extension (-10dB) | 42Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 63Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 2.9kHz |
| DIY Kit | No |
| Dimensions | 11.4”H x 6.5”W x 9.8”D (290 x 165 x 250 mm) |
| Drivers | 5.25” midwoofer, 1” soft fabric dome tweeter with waveguide |
| Impedance | 6 ohms nominal, 4.7 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 84dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.96 |
| Spinorama Preference Score with Perfect Sub | 7.18 |
| Weight | 20.1 lbs (9.1 kg) each |
| Woofer Cabinet | ported, rear slot port |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
ELAC Uni-Fi 2.0 UB52: $599.00 per pair Amazon eBay
Pros: Wide, smooth horizontal directivity: beamwidth holds to about ±60 degrees up to 8kHz before narrowing. Vertical directivity is substantially better than average, giving more listening-height leeway than most two-way bookshelf speakers. Measured bass extension of 55.7Hz (-3dB), with a measured sensitivity of 83.3dB.
Cons: Dipped 3db from 1.5-3kHz. On-axis response shelves down above 1.5kHz along with multiple resonances, leading the reviewer to predict it will “likely sound dull.” Nasty resonance at 600Hz: audible as an actual buzzing artifact on some recordings (the reviewer demonstrated it with an Eva Cassidy track), and it shows up as a sharp distortion spike exceeding 4% at 585Hz when driven to 96dB SPL/1m. Not recommended.
Full ELAC Uni-Fi 2.0 UB52 review and specifications →
| Bass Extension (-10dB) | 38.6Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 55.7Hz (measured, Audio Science Review) |
| Crossover Frequency | 200Hz / 2000Hz |
| DIY Kit | No |
| Dimensions | 13.6”H x 7.3”W x 10.8”D (346 x 185 x 275 mm) |
| Drivers | 5.25” aluminum woofer, 4” aluminum midrange, 1” soft dome tweeter |
| Impedance | 6 ohms |
| Power Handling | 140W max |
| Sensitivity | 83.3dB (measured by Audio Science Review; 85dB manufacturer specified) |
| Spinorama Preference Score | 5.32 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.34 (spinorama.org) |
| Weight | 7.7 lbs (3.5 kg) |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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