KEF R3 vs Mission LX-3 MKII

Short answer: the KEF R3. It ranks #15 of 130 bookshelf speakers by sound quality; the Mission LX-3 MKII ranks #80.

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 Mission LX-3 MKII offers: A large affordable standmount with a 6.5-inch woofer, 88dB rated sensitivity and useful bass. ASR measured 48Hz estimated in-room extension, a controlled Q of 0.60, a 5.52 subwoofer-assisted preference score and reasonable +/-55-degree horizontal coverage. Watch for: On-axis smoothness of 0.217 and predicted in-room smoothness of 0.344 reveal clear response unevenness, with a -0.46dB-per-octave downward tilt. The 345mm-tall, 8.4kg cabinet is bulky and current US availability is limited.

Buy the KEF R3 if sound quality is the priority over the price, or the Mission LX-3 MKII if the price is the priority over sound quality.

Looking for alternatives? See the complete Passive Home rankings.

Specifications Side By Side

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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

• Links
  • Official KEF R3 Page
• Reviews, Comparisons and Sound Samples
  • Erin’s Audio Corner: KEF R3 Review More from Erin’s Audio Corner →
  • Erin’s Audio Corner Website: KEF R3
  • Audio Science Review Measurements More from Audio Science Review →
  • Audio Science Review Measurements (spinorama.org)
• Head-to-Head Comparisons
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Mission LX-3 MKII: £249 per pair Richer Sounds eBay

Pros: A large affordable standmount with a 6.5-inch woofer, 88dB rated sensitivity and useful bass. ASR measured 48Hz estimated in-room extension, a controlled Q of 0.60, a 5.52 subwoofer-assisted preference score and reasonable +/-55-degree horizontal coverage.

Cons: On-axis smoothness of 0.217 and predicted in-room smoothness of 0.344 reveal clear response unevenness, with a -0.46dB-per-octave downward tilt. The 345mm-tall, 8.4kg cabinet is bulky and current US availability is limited.

Full Mission LX-3 MKII review and specifications →

Country	United Kingdom (design)
Dimensions	13.6H x 8.9W x 12.1D in
Drivers	1" microfiber-dome tweeter, 6.5" composite-fiber woofer
Enclosure	2-way, bass-reflex
Impedance	8 ohms nominal, 4.1 ohms minimum
Sensitivity	88dB
Spinorama Preference Score	3.26
Spinorama Preference Score with Perfect Sub	5.52
Weight	18.5 lbs (8.4 kg) each

• Links
  • Mission LX-3 MKII Official Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review Measurements (spinorama.org) More from Audio Science Review →
• Head-to-Head Comparisons
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