Short answer: the Klipsch RP-600M II. It ranks #123 of 222 bookshelf speakers by sound quality, rated 3.7/5, at $449.99; the ATC SCM19 ranks #209, rated 2.4/5, and costs $3,750, so there is little reason to consider the other one.
The Klipsch RP-600M II is the more accurate pick. Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals. Its measured preference score, a predictor of how neutral it sounds, is 5.64 against 4.61 for the ATC SCM19. Watch for: On-axis, the treble runs notably hot (even hotter than the original Klipsch RP-600M in some respects) and needs about 20° of toe-out or the grille installed to sound balanced.
The ATC SCM19 is the deeper-bass choice. 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 70Hz for the Klipsch RP-600M II. The catch: Some stored energy resonance around 500-700Hz, 4dB bump around 700Hz.
Buy the Klipsch RP-600M II. It is rated higher for sound quality than the ATC SCM19 and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Passive Home rankings.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
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
| Klipsch RP-600M II | ATC SCM19 | |
|---|---|---|
| Price | $449.99 per pair | $3750 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #209 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 34Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 60Hz (measured, Audio Science Review) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 17.2”H x 10.4”W x 11.8”D (436.9 x 264.2 x 299.7 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 6 ohms |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 85dB (measured, Audio Science Review) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 5.9” Super Linear Magnet cone woofer, 1” soft dome tweeter |
| Weight | 13 lbs (5.9 kg) each | 39.2 lbs (17.8 kg) each |
| Woofer Cabinet | ported | sealed |
| Spinorama Preference Score | 5.64 | 4.61 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 7.03 |
| DIY Kit | No | No |
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