Short answer: the Perlisten S4b if sound quality matters most, the KEF R3 if price matters most. The Perlisten S4b ranks #2 of 222 bookshelf speakers, rated 4.8/5, at $8,000. The KEF R3 ranks #15, rated 4.5/5, at $1,544.56, $6,455.44 cheaper.
The KEF R3 is the more accurate, deeper-bass pick. A three way bookshelf speaker with KEF’s coaxial driver for stable imaging across seats and very low distortion, easy to run with a modest amp. Its measured preference score, a predictor of how neutral it sounds, is 6.20 against 5.35 for the Perlisten S4b. Its bass reaches about 58Hz before falling 3dB, against 78Hz for the Perlisten S4b. The tradeoff: The low-frequency alignment rolls gradually rather than delivering high-output sub-bass; KEF specifies 58Hz +/-3dB and Erin’s high-level data supports using an 80Hz subwoofer crossover.
What the Perlisten S4b does well: A compact sealed bookshelf speaker with reference grade accuracy, exceptionally smooth dispersion, and very low distortion at high volume. The catch: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification.
Buy the KEF R3 when the price outweighs sound quality for you, and the Perlisten S4b when sound quality outweighs the price instead.
Want more options? Browse the full Passive Home rankings.
A three way bookshelf speaker with KEF’s coaxial driver for stable imaging across seats and very low distortion, easy to run with a modest amp.
A compact sealed bookshelf speaker with reference grade accuracy, exceptionally smooth dispersion, and very low distortion at high volume.
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Specifications Side By Side
| KEF R3 | Perlisten S4b | |
|---|---|---|
| Price | $1,544.56 per pair | $8,000 per pair |
| Ranked | #15 of 222 in Large Size Bookshelf Speakers | #2 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin’s measured roll-off) | 78Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) | 40Hz (measured, Erin’s Audio Corner) |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin’s Audio Corner) | 84.5dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Impedance | 8 ohms nominal; suitable for Erin’s 4/8-ohm-rated amplifier | Just under 4 ohms minimum (measured, Erin’s Audio Corner) |
| Drivers | 1” tweeter coaxial with 5” midrange; 6.5” woofer | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7” woofer |
| Dimensions | 16.6”H x 7.9”W x 13.2”D | 16.5”H x 9.4”W x 7.3”D |
| Woofer Cabinet | ported, rear Flexible Port | sealed |
| Weight | 29.9 lbs (13.55 kg) each | 24.3 lbs (11 kg) each |
| Spinorama Preference Score | 6.2 (spinorama.org) | 5.35 |
| Spinorama Preference Score with Perfect Sub | 7.97 (spinorama.org) | 8.01 |
| DIY Kit | No | No |
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