Short answer: the ELAC Uni-Fi 2.0 UB52, with the Micca RB42 winning on finish, though neither ranks well in its class. The UB52’s horizontal directivity is wide and smooth to about ±60 degrees at 8kHz, though it dips 3db between 1.5-3kHz. The RB42’s curved cabinet looks closer to a $400-500 speaker than a $150 one, but its spinorama shows significant peaks and valleys in the on-axis and listening-window response from a few kHz up. Both are rated below 3.0/5 among the 90 bookshelf speakers; for better sound, the Philharmonic Ceramic Mini ranks #2 at $900.
Buy the ELAC Uni-Fi 2.0 UB52 if sound quality is the priority over the price, or the Micca RB42 if the price is the priority over sound quality.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| ELAC Uni-Fi 2.0 UB52 | Micca RB42 | |
|---|---|---|
| Price | $799.00 per pair | $159.99 per pair |
| Ranked | #70 of 90 in Medium Size Bookshelf Speakers | #75 of 90 in Medium Size Bookshelf Speakers |
| Crossover Frequency | 200Hz / 2000Hz | - |
| Dimensions | 13.6”H x 7.3”W x 10.8”D (346 x 185 x 275 mm) | 8.7H x 4.9W x 7.9D in |
| Impedance | 6 ohms | 4-8 ohms |
| Sensitivity | 83.3dB (measured by Audio Science Review; 85dB manufacturer specified) | 80dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 5.25” aluminum woofer, 4” aluminum midrange, 1” soft dome tweeter | 4” coated paper woofer, 0.75” silk dome tweeter |
| Power Handling | 140W max | 15-100W each |
| Woofer Cabinet | ported | ported, front |
| Weight | 7.7 lbs (3.5 kg) | 6 lbs (2.7 kg) each (per retailer listing) |
| Bass Extension (-3dB) | 55.7Hz (measured, Audio Science Review) | 85Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
| Bass Extension (-10dB) | 38.6Hz (measured, Audio Science Review) | 62Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
| Spinorama Preference Score | 5.32 (spinorama.org) | 4.59 |
| Spinorama Preference Score with Perfect Sub | 7.34 (spinorama.org) | 6.87 |
| DIY Kit | No | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified, typical in-room) |
Related Speaker Comparisons
More worthwhile head-to-heads for ELAC Uni-Fi 2.0 UB52:
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- ELAC Uni-Fi 2.0 UB52 vs Ascend Sierra 1 v2
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- ELAC Uni-Fi 2.0 UB52 vs Arendal 1961 Monitor
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Prices on this page were last checked October 2, 2026 at 10:18 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
ELAC Uni-Fi 2.0 UB52: $799.00 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
- ELAC Uni-Fi 2.0 UB52 vs KEF Q100
- ELAC Uni-Fi 2.0 UB52 vs JBL Stage A120
- ELAC Uni-Fi 2.0 UB52 vs Q Acoustics 3020i
- ELAC Uni-Fi 2.0 UB52 vs JBL L52 Classic
- ELAC Uni-Fi 2.0 UB52 vs Q Acoustics 5020
- ELAC Uni-Fi 2.0 UB52 vs Pioneer SP-BS22-LR (Philharmonic AAM Mod)
- ELAC Uni-Fi 2.0 UB52 vs Dynaudio X14
- ELAC Uni-Fi 2.0 UB52 vs JBL Stage A130
- See all 41 comparisons
Micca RB42: $159.99 per pair Amazon eBay
Pros: Curved cabinet fit and finish look closer to a speaker costing three times as much. Rated for a wide 15-100W amplifier range with 4-8 ohm compatibility, giving flexibility with modest amplification. Measured bass extension of 85Hz (-3dB), with a measured sensitivity of 80dB.
Cons: CEA2034 spinorama shows significant peaks and valleys in the on-axis and listening-window response starting a few kHz up, with excess high-frequency energy the reviewer found fatiguing over time despite an initial impression of “detail.” Off-axis response diverges heavily from on-axis, meaning tonality shifts with room and listening position in ways EQ can’t correct. Distorts and the woofer visibly flaps under moderate volume; low 83dB sensitivity makes it a harder amplifier load than its size suggests.
Full Micca RB42 review and specifications →
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
|---|---|
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
| DIY Kit | No |
| Dimensions | 8.7H x 4.9W x 7.9D in |
| Drivers | 4” coated paper woofer, 0.75” silk dome tweeter |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified, typical in-room) |
| Impedance | 4-8 ohms |
| Power Handling | 15-100W each |
| Sensitivity | 80dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 4.59 |
| Spinorama Preference Score with Perfect Sub | 6.87 |
| Weight | 6 lbs (2.7 kg) each (per retailer listing) |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons