Mission LX-3 MKII vs ATC SCM19

Short answer: the Mission LX-3 MKII. It ranks #80 of 130 bookshelf speakers by sound quality; the ATC SCM19 ranks #119.

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.

What the ATC SCM19 offers: Harmonic distortion at 96dB SPL/1m stays generally low across the range aside from the spike tied to the 700-800Hz resonance. Sealed (unported) cabinet avoids port noise and resonance, and the extremely dense, heavy-duty enclosure (17.8kg/39lb each) reflects ATC’s pro-audio build standards. Watch for: Some stored energy resonance around 500-700hz, 4dB bump around 700hz. Not recommended for the price. CEA2034 spinorama and predicted in-room response both show a very uneven overall balance - a broad accentuation from midrange to treble paired with too little bass - along with directivity error. At 96dB SPL/1m, harmonic distortion tied to the 500-700Hz resonance rises to a level the reviewer says “should not be there.”

Buy the Mission LX-3 MKII if sound quality matters more than the price. Buy the ATC SCM19 if the price matters more than sound quality.

Skip the ATC SCM19 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

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Prices on this page were last checked September 16, 2026 at 12:41 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.

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The Two Speakers In Full

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 →
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ATC SCM19: $3750 per pair Tmraudio eBay

Pros: Harmonic distortion at 96dB SPL/1m stays generally low across the range aside from the spike tied to the 700-800Hz resonance. Sealed (unported) cabinet avoids port noise and resonance, and the extremely dense, heavy-duty enclosure (17.8kg/39lb each) reflects ATC’s pro-audio build standards. Measured bass extension of 60Hz (-3dB), with a measured sensitivity of 85dB.

Cons: Some stored energy resonance around 500-700hz, 4dB bump around 700hz. Not recommended for the price. CEA2034 spinorama and predicted in-room response both show a very uneven overall balance - a broad accentuation from midrange to treble paired with too little bass - along with directivity error. At 96dB SPL/1m, harmonic distortion tied to the 500-700Hz resonance rises to a level the reviewer says “should not be there.”

Full ATC SCM19 review and specifications →

Bass Extension (-10dB)	34Hz (measured, Audio Science Review)
Bass Extension (-3dB)	60Hz (measured, Audio Science Review)
Dimensions	17.2"H x 10.4"W x 11.8"D (436.9 x 264.2 x 299.7 mm)
Drivers	5.9" Super Linear Magnet cone woofer, 1" soft dome tweeter
Impedance	6 ohms
Sensitivity	85dB (measured, Audio Science Review)
Spinorama Preference Score	3.79
Spinorama Preference Score with Perfect Sub	6.21
Weight	39.2 lbs (17.8 kg) each
Woofer Cabinet	sealed

• Links
  • Official ATC SCM19 Website
• Reviews, Comparisons and Sound Samples
  • Audio Science Review ATC SCM19 More from Audio Science Review →
  • Audio Science Review Measurements (spinorama.org)
• Head-to-Head Comparisons
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