Short answer: the Radiant Acoustics Clarity 6.2. It ranks #28 of 222 bookshelf speakers by sound quality, rated 4.4/5, at $4,500. The Sonus Faber Lumina II Amator ranks #188, rated 3.0/5, at $2,000, $2,500 cheaper, which does not close the gap in sound quality.
The Radiant Acoustics Clarity 6.2 is the better-sounding, deeper-bass pick. A Purifi driver bookshelf speaker with an AMT tweeter, rigid cabinet, non-fatiguing sound, and precise, well focused imaging. Its bass reaches about 55Hz before falling 3dB, against 63Hz for the Sonus Faber Lumina II Amator. The tradeoff: Needs a fairly specific setup to sound its best: about 15-20° of toe-out (per the manufacturer’s own recommendation) and roughly 2 feet from the rear wall; pointed straight on-axis, the treble reads as noticeably elevated.
The case for the Sonus Faber Lumina II Amator: A luxurious Italian bookshelf speaker with a gorgeous cabinet, solid bass for its size and wide, consistent dispersion. The tradeoff: Very bright treble, running 3-6dB above the midrange depending on measurement angle: independently corroborated by other owners online, not just one reviewer’s opinion.
Buy the Radiant Acoustics Clarity 6.2. It is rated higher for sound quality, and the $2,500 saving on the Sonus Faber Lumina II Amator is not enough to make up the difference.
Looking for alternatives? See the complete Passive Home rankings.
A Purifi driver bookshelf speaker with an AMT tweeter, rigid cabinet, non-fatiguing sound, and precise, well focused imaging.
A luxurious Italian bookshelf speaker with a gorgeous cabinet, solid bass for its size and wide, consistent dispersion.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| Radiant Acoustics Clarity 6.2 | Sonus Faber Lumina II Amator | |
|---|---|---|
| Price | $4500 per pair | $2000 per pair |
| Ranked | #28 of 222 in Large Size Bookshelf Speakers | #188 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 32Hz (measured, Erin’s Audio Corner) | 43Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 63Hz (measured, Erin’s Audio Corner) |
| Dimensions | 14.3”H x 8.7”W x 10.5”D (363.2 x 221 x 266.7 mm) | 12” x 7.1” x 10.4” (304 x 180 x 263 mm) |
| Impedance | 4 ohms nominal (2.1 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 4 ohms nominal, 3.9 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 84.3dB (measured, Erin’s Audio Corner) | 86.9dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Drivers | 6.5” PURIFI USHINDI woofer, Custom AMT (Air Motion Transformer) tweeter | 1.14” DAD (Damped Apex Dome) tweeter, 5.9” paper cone woofer |
| Weight | 23.8 lbs (10.8 kg) each | 12.8 lbs (5.8 kg) |
| Woofer Cabinet | passive radiator | Bass reflex, ported |
| Spinorama Preference Score | 5.97 | - |
| Spinorama Preference Score with Perfect Sub | 7.75 | - |
| DIY Kit | No | No |
| Frequency Response | - | 55Hz - 24kHz (Manufacturer specified) |
| Crossover Frequency | - | 2600Hz |
| Recommended Power | - | 30W - 150W |
| Country | - | Italy (Vicenza) |
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