Short answer: the KEF R3. It ranks #15 of 222 bookshelf speakers by sound quality, rated 4.5/5, at $1,544.56. The Polk Reserve R100 ranks #160, rated 3.4/5, at $699, $845.56 cheaper, which does not close the gap in sound quality.
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 5.46 for the Polk Reserve R100. Its bass reaches about 58Hz before falling 3dB, against 68Hz for the Polk Reserve R100. 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.
Why pick the Polk Reserve R100: Compact bookshelf speakers with unusually useful bass for their size and a vent that avoids port noise. Watch for: Erin measured only about 85dB sensitivity and the impedance reaches 3.6 ohms, so it is neither efficient nor an entirely benign AVR load.
Buy the KEF R3. It is rated higher for sound quality, and the $845.56 saving on the Polk Reserve R100 is not enough to make up the difference.
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.
Compact bookshelf speakers with unusually useful bass for their size and a vent that avoids port noise.
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Specifications Side By Side
| KEF R3 | Polk Reserve R100 | |
|---|---|---|
| Price | $1,544.56 per pair | $699.00 per pair |
| Ranked | #15 of 222 in Large Size Bookshelf Speakers | #160 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin’s measured roll-off) | 68Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) | 49Hz (measured, Erin’s Audio Corner) |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin’s Audio Corner) | 85dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Impedance | 8 ohms nominal; suitable for Erin’s 4/8-ohm-rated amplifier | 3.6 ohms minimum (measured, Erin’s Audio Corner) |
| Drivers | 1” tweeter coaxial with 5” midrange; 6.5” woofer | 1” Pinnacle ring-radiator tweeter; 5.25” Turbine Cone midwoofer |
| Dimensions | 16.6”H x 7.9”W x 13.2”D | 12.8”H x 6.5”W x 10.2”D |
| Woofer Cabinet | ported, rear Flexible Port | ported, rear X-Port |
| Weight | 29.9 lbs (13.55 kg) each | 12.1 lbs (5.5 kg) each |
| Spinorama Preference Score | 6.2 (spinorama.org) | 5.46 |
| Spinorama Preference Score with Perfect Sub | 7.97 (spinorama.org) | 7.93 |
| DIY Kit | No | No |
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