Short answer: the KEF R3 Meta. It ranks #10 of 222 bookshelf speakers by sound quality (rated 4.6/5); the AsciLab A6B Passive ranks #18 (rated 4.5/5).
What the KEF R3 Meta does well: A three way bookshelf speaker with KEF’s coaxial driver, superb accuracy that holds across the room, and bass that reaches deep for its size. Watch for: Pointed straight on-axis, there’s a 1-2dB bump around 9kHz that stays consistent across angles thanks to the constant-directivity waveguide: only toeing the speaker out about 10° tames it.
The AsciLab A6B Passive is the deeper-bass choice. A sealed bookshelf speaker with a Purifi woofer and passive radiators, essentially flat response, and solid bass for its size. Its bass reaches about 41Hz before falling 3dB, against 76Hz for the KEF R3 Meta. Watch for: 4 ohm nominal impedance and 82dB sensitivity call for a robust amplifier.
Buy the KEF R3 Meta. It is rated higher for sound quality than the AsciLab A6B Passive.
Looking for alternatives? See the complete Passive Home rankings.
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Specifications Side By Side
| KEF R3 Meta | AsciLab A6B Passive | |
|---|---|---|
| Price | $2,499.99 per pair | €3,790 per pair |
| Ranked | #10 of 222 in Large Size Bookshelf Speakers | #18 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | 34.7Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 76Hz (measured, Erin’s Audio Corner) | 41.0Hz (measured, Audio Science Review) |
| Dimensions | 16.6”H x 7.9”W x 13.2”D (421.6 x 200.7 x 335.3 mm) | 15.9”H x 8.7”W x 11.8”D (405 x 220 x 300 mm) |
| Impedance | 4 ohms nominal (3.2 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 4 ohms nominal |
| Drivers | 6.5” Hybrid aluminum ported woofer, 5” aluminum cone midrange, 1” vented aluminium dome with MAT tweeter | 1” dome tweeter, 6.5” Purifi aluminum cone woofer, 2x 6.5” Purifi passive radiators |
| Sensitivity | 85.9dB (measured, Erin’s Audio Corner; 87dB manufacturer specified) | 82dB @ 2.83V/1m |
| Weight | 27.3 lbs (12.4 kg) each | 27.1 lbs (12.3 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 6.10 | 6.50 |
| Spinorama Preference Score with Perfect Sub | 7.91 | 8.24 |
| DIY Kit | No | No |
| Enclosure | - | sealed with passive radiators |
| Crossover Frequency | - | 1kHz |
| Warranty | - | 2 years |
| Country | - | South Korea |
| Maximum SPL | - | 102dB full bandwidth, 106dB above 100Hz (manufacturer specified) |
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