Short answer: the Radiant Acoustics Clarity 4.2 for the higher ranking, the ELAC Uni-Fi 2.0 UB52 for the lower price. The Radiant Acoustics Clarity 4.2 ranks #9 of 21 bookshelf speakers at $2998. The ELAC Uni-Fi 2.0 UB52 ranks #12 at $799, $2199 cheaper.
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. The catch: Dipped 3db from 1.5-3khz.
What the Radiant Acoustics Clarity 4.2 gets right: Compact bookshelf design using a 4” Purifi mid-woofer with matching Purifi passive radiators and an AMT tweeter on a purpose-designed. Set against that: Low sensitivity (rated 78dB, measured 78.5dB) is the trade-off for its bass extension - needs a fair amount of amplifier power.
Buy the ELAC Uni-Fi 2.0 UB52 if the price matters more than the ranking. Buy the Radiant Acoustics Clarity 4.2 if the ranking matters more than the price.
Specifications Side By Side
| ELAC Uni-Fi 2.0 UB52 | Radiant Acoustics Clarity 4.2 | |
|---|---|---|
| Price | $799.00 | $2,998 |
| Ranked | #12 of 21 in Medium Size Bookshelf Speakers | #9 of 21 in Medium Size Bookshelf Speakers |
| Crossover Frequency | 200Hz / 2000Hz | - |
| Dimensions | 13.62"H x 7.28"W x 10.83"D (346 x 185 x 275 mm) | 9.5"H x 6.3"W x 9.4"D (241 x 160 x 239 mm) |
| Impedance | 6 ohms | 4 ohms |
| Sensitivity | 85dB | 78 dB |
| Drivers | 5.25" aluminum woofer, 4" aluminum midrange, 1" soft dome tweeter | (2) 4" (102mm) woofer + AMT tweeter |
| Power Handling | 140W max | - |
| Woofer Cabinet | Bass reflex | - |
| Weight | 7.7 lbs / 3.5 kg | 28.7 lbs / 13 kg (per pair: 57.3 lbs / 26 kg) |
| Enclosure | - | sealed |
| Bass Extension (-3dB) | - | 44 Hz |
| Bass Extension (-10dB) | - | 35 Hz |
| Frequency Response | - | 40 Hz - 25 kHz |
| Woofer | - | 4" (102mm) PURIFI USHINDI |
| Tweeter | - | AMT (Air Motion Transformer) |
| Amplifier Required | - | Yes |
| Recommended Power | - | 50-200W |
The Two Speakers In Full
ELAC Uni-Fi 2.0 UB52: $799.00 Amazon
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.
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.
| Crossover Frequency | 200Hz / 2000Hz |
|---|---|
| Dimensions | 13.62"H x 7.28"W x 10.83"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 | 85dB |
| Weight | 7.7 lbs / 3.5 kg |
| Woofer Cabinet | Bass reflex |
- Reviews, Comparisons and Sound Samples
- Links
Radiant Acoustics Clarity 4.2: $2,998 Radiant Acoustics
Pros: Compact bookshelf design using a 4” Purifi mid-woofer with matching Purifi passive radiators and an AMT tweeter on a purpose-designed waveguide, built with genuine heft - aluminum baffle, extensive internal bracing and damping. Surprisingly wide horizontal dispersion (about ±70° through the midrange and into the treble), more enveloping than its larger 6.2 sibling despite the smaller cabinet. More linear on-axis than the bigger Clarity 6.2, which needs 15-20° of toe-out to tame a rising treble; the 4.2 can be listened to closer to on-axis without that same correction. Wider-than-typical vertical dispersion (roughly +30°/-20°) for a two-way design, since its smaller woofer keeps the tweeter-to-woofer distance short. Genuinely deep bass extension for its size (F3 44Hz, reaching about 40Hz in-room), though it comes at a real cost to sensitivity. No resonance issues visible in impedance measurements.
Cons: Low sensitivity (rated 78dB, measured 78.5dB) is the trade-off for its bass extension - needs a fair amount of amplifier power, around 100W recommended for small-to-medium rooms versus the manufacturer’s own 60W baseline. Designed specifically for smaller rooms; the reviewer had to move testing out of his open-plan living room and into a smaller bedroom to avoid running into compression. A dip in the upper midrange gives a mild lack of attack and clarity, and a peak around 5kHz occasionally added a touch of extra sibilance. Multitone distortion crosses the reviewer’s 3% threshold at 96dB, making about 88dB a better average listening level; a slight upper-midrange bump persists even with an 80Hz high-pass filter applied. Dynamic range is limited: fine at 86dB, but the woofer starts giving up headroom by 96dB and drops off significantly by 102dB. Compared to its pricier sibling Clarity 6.2, has notably less dynamic range and higher multitone distortion, reflecting the smaller driver complement. A niche product size-wise - the reviewer couldn’t identify a clear direct competitor in the same size/price/SPL class.
| Amplifier Required | Yes |
|---|---|
| Bass Extension (-10dB) | 35 Hz |
| Bass Extension (-3dB) | 44 Hz |
| Dimensions | 9.5"H x 6.3"W x 9.4"D (241 x 160 x 239 mm) |
| Drivers | (2) 4" (102mm) woofer + AMT tweeter |
| Enclosure | sealed |
| Frequency Response | 40 Hz - 25 kHz |
| Impedance | 4 ohms |
| Recommended Power | 50-200W |
| Sensitivity | 78 dB |
| Tweeter | AMT (Air Motion Transformer) |
| Weight | 28.7 lbs / 13 kg (per pair: 57.3 lbs / 26 kg) |
| Woofer | 4" (102mm) PURIFI USHINDI |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- 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.