Short answer: the KEF R3 if sound quality matters most, the Emotiva Airmotiv B2+ if price matters most. The KEF R3 ranks #15 of 130 bookshelf speakers at $2200. The Emotiva Airmotiv B2+ ranks #101 at $449, $1751 cheaper.
What the KEF R3 offers: True three-way stand-mount with a 6.5-inch woofer below KEF’s 5-inch Uni-Q midrange/1-inch tweeter. Erin measured approximately 86-87dB/2.83V/1m sensitivity, exceptionally low sub-1% distortion at 86dB and orderly directivity in both planes. The coaxial geometry maintains image stability across seats, while Flexible Port Technology avoids the strong midrange port resonance common to rear-vented competitors. A 110W Parasound drove it successfully in Erin’s listening. Watch for: 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. Narrow high-frequency features and natural Uni-Q narrowing toward the top octave make toe angle audible, although off-axis tracking remains smooth. Sensitivity is moderate, the cabinet weighs almost 30 lb, and this original R3 lacks the Meta successor’s MAT absorber.
What the Emotiva Airmotiv B2+ offers: Erin measured a useful 86dB average sensitivity and strong midbass punch around 120Hz. The folded-ribbon tweeter provides very broad upper-treble radiation, and the speaker can create a spacious presentation when positioned carefully. Response and directivity remain reasonably orderly below the roughly 2kHz crossover region. The 6.5-inch woofer offers more output capability than compact 5-inch competitors, while F3/F10 of 66/43Hz leave adequate overlap for a conventional 80Hz subwoofer crossover. Horizontal directivity data makes the broad baffle-step trend amenable to partial EQ below the crossover. Watch for: The replacement B2+ did not deliver the neutral upgrade Erin expected. A baffle-step loss around 500Hz depresses the lower midrange while the AMT’s much wider radiation above crossover injects excess room energy, yielding a bright, forward balance and false impression of cymbal detail. The directivity discontinuity near 2kHz cannot be completely equalized. Erin measured F3 at 66Hz and F10 at 43Hz, so meaningful kick-drum fundamentals and low bass still need a subwoofer. Vertical listening tolerance is roughly +/-10 degrees, with best results between the top of the woofer and tweeter axes. Broad lateral treble energy may require careful toe-out and sidewall absorption. Despite a large cabinet, it offers limited deep-bass advantage and was not Erin’s hoped-for successor to the more linear B1+.
Buy the KEF R3 if sound quality matters more than the price. Buy the Emotiva Airmotiv B2+ if the price matters more than sound quality.
Skip the Emotiva Airmotiv B2+ if sound quality matters to you. It ranks near the bottom of the 130 bookshelf speakers.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| KEF R3 | Emotiva Airmotiv B2+ | |
|---|---|---|
| Price | $2,200 per pair | $449.00 per pair |
| Ranked | #15 of 130 in Large Size Bookshelf Speakers | #101 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin's measured roll-off) | 66Hz (measured, Erin's Audio Corner) |
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) | 43Hz (measured, Erin's Audio Corner) |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin's Audio Corner) | 86dB (measured average, Erin's Audio Corner) |
| Impedance | 8 ohms nominal; suitable for Erin's 4/8-ohm-rated amplifier | 4 ohms nominal (manufacturer specified) |
| Drivers | 1" tweeter coaxial with 5" midrange; 6.5" woofer | 6.5" woven-fiber woofer, 32 x 25mm folded-ribbon tweeter |
| Dimensions | 16.6"H x 7.9"W x 13.2"D | - |
| Woofer Cabinet | ported, rear Flexible Port | ported, rear |
| Spinorama Preference Score | - | 4.71 |
| Spinorama Preference Score with Perfect Sub | - | 7.07 |
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The Two Speakers In Full
KEF R3: $2,200 per pair Amazon eBay
Pros: True three-way stand-mount with a 6.5-inch woofer below KEF’s 5-inch Uni-Q midrange/1-inch tweeter. Erin measured approximately 86-87dB/2.83V/1m sensitivity, exceptionally low sub-1% distortion at 86dB and orderly directivity in both planes. The coaxial geometry maintains image stability across seats, while Flexible Port Technology avoids the strong midrange port resonance common to rear-vented competitors. A 110W Parasound drove it successfully in Erin’s listening. Measured bass extension of 35.2Hz (-10dB), with a measured sensitivity of 87dB.
Cons: 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. Narrow high-frequency features and natural Uni-Q narrowing toward the top octave make toe angle audible, although off-axis tracking remains smooth. Sensitivity is moderate, the cabinet weighs almost 30 lb, and this original R3 lacks the Meta successor’s MAT absorber.
Full KEF R3 review and specifications →
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin's measured roll-off) |
| Dimensions | 16.6"H x 7.9"W x 13.2"D |
| Drivers | 1" tweeter coaxial with 5" midrange; 6.5" woofer |
| Impedance | 8 ohms nominal; suitable for Erin's 4/8-ohm-rated amplifier |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin's Audio Corner) |
| Woofer Cabinet | ported, rear Flexible Port |
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- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Emotiva Airmotiv B2+: $449.00 per pair eBay
Pros: Erin measured a useful 86dB average sensitivity and strong midbass punch around 120Hz. The folded-ribbon tweeter provides very broad upper-treble radiation, and the speaker can create a spacious presentation when positioned carefully. Response and directivity remain reasonably orderly below the roughly 2kHz crossover region. The 6.5-inch woofer offers more output capability than compact 5-inch competitors, while F3/F10 of 66/43Hz leave adequate overlap for a conventional 80Hz subwoofer crossover. Horizontal directivity data makes the broad baffle-step trend amenable to partial EQ below the crossover. Measured bass extension of 66Hz (-3dB), with a measured sensitivity of 86dB.
Cons: The replacement B2+ did not deliver the neutral upgrade Erin expected. A baffle-step loss around 500Hz depresses the lower midrange while the AMT’s much wider radiation above crossover injects excess room energy, yielding a bright, forward balance and false impression of cymbal detail. The directivity discontinuity near 2kHz cannot be completely equalized. Erin measured F3 at 66Hz and F10 at 43Hz, so meaningful kick-drum fundamentals and low bass still need a subwoofer. Vertical listening tolerance is roughly +/-10 degrees, with best results between the top of the woofer and tweeter axes. Broad lateral treble energy may require careful toe-out and sidewall absorption. Despite a large cabinet, it offers limited deep-bass advantage and was not Erin’s hoped-for successor to the more linear B1+.
Full Emotiva Airmotiv B2+ review and specifications →
| Bass Extension (-10dB) | 43Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 66Hz (measured, Erin's Audio Corner) |
| Drivers | 6.5" woven-fiber woofer, 32 x 25mm folded-ribbon tweeter |
| Impedance | 4 ohms nominal (manufacturer specified) |
| Sensitivity | 86dB (measured average, Erin's Audio Corner) |
| Spinorama Preference Score | 4.71 |
| Spinorama Preference Score with Perfect Sub | 7.07 |
| Woofer Cabinet | ported, rear |
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