Short answer: the Mission LX-3 MKII. It ranks #138 of 222 bookshelf speakers by sound quality (rated 3.6/5); the ATC SCM19 ranks #209 (rated 2.4/5).
The Mission LX-3 MKII is the better-sounding choice. Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity. 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 ATC SCM19 is the deeper-bass pick. A heavy, sealed pro style ATC bookshelf speaker with a very dense cabinet and low distortion at high volume. Its bass reaches about 60Hz before falling 3dB, against 67.4Hz for the Mission LX-3 MKII. The catch: Some stored energy resonance around 500-700Hz, 4dB bump around 700Hz.
Buy the Mission LX-3 MKII. It is rated higher for sound quality than the ATC SCM19.
Want more options? Browse the full Passive Home rankings.
Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity.
A heavy, sealed pro style ATC bookshelf speaker with a very dense cabinet and low distortion at high volume.
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Specifications Side By Side
| Mission LX-3 MKII | ATC SCM19 | |
|---|---|---|
| Price | £249 per pair | $3750 per pair |
| Ranked | #138 of 222 in Large Size Bookshelf Speakers | #209 of 222 in Large Size Bookshelf Speakers |
| Enclosure | 2-way, bass-reflex | - |
| Drivers | 1” microfiber-dome tweeter, 6.5” composite-fiber woofer | 5.9” Super Linear Magnet cone woofer, 1” soft dome tweeter |
| Dimensions | 13.6H x 8.9W x 12.1D in | 17.2”H x 10.4”W x 11.8”D (436.9 x 264.2 x 299.7 mm) |
| Weight | 18.5 lbs (8.4 kg) each | 39.2 lbs (17.8 kg) each |
| Sensitivity | 88dB | 85dB (measured, Audio Science Review) |
| Impedance | 8 ohms nominal, 4.1 ohms minimum | 6 ohms |
| Country | United Kingdom (design) | - |
| Spinorama Preference Score | 4.17 | 4.61 |
| Spinorama Preference Score with Perfect Sub | 6.42 | 7.03 |
| Bass Extension (-3dB) | 67.4Hz (measured, ASR via spinorama.org) | 60Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 42.5Hz (derived from ASR on-axis curve, spinorama.org) | 34Hz (measured, Audio Science Review) |
| DIY Kit | No | No |
| Woofer Cabinet | - | sealed |
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