Short answer: the Klipsch RP-600M II. It ranks #123 of 222 bookshelf speakers by sound quality (rated 3.7/5); the Mission LX-3 MKII ranks #138 (rated 3.6/5).
The Klipsch RP-600M II is the more accurate option. 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 4.17 for the Mission LX-3 MKII. The catch: 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.
Why pick the Mission LX-3 MKII: Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity. The catch: 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.
Buy the Klipsch RP-600M II. It is rated higher for sound quality than the Mission LX-3 MKII.
Looking for alternatives? See the complete Passive Home rankings.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
Large affordable standmount speakers with a 6.5 inch woofer, useful bass and easy to drive sensitivity.
Prices on this page were last checked October 31, 2026 at 7:11 PM 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Klipsch RP-600M II | Mission LX-3 MKII | |
|---|---|---|
| Price | $449.99 per pair | £249 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #138 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 42.5Hz (derived from ASR on-axis curve, spinorama.org) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 67.4Hz (measured, ASR via spinorama.org) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 13.6H x 8.9W x 12.1D in |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal, 4.1 ohms minimum |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 88dB |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 1” microfiber-dome tweeter, 6.5” composite-fiber woofer |
| Weight | 13 lbs (5.9 kg) each | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.64 | 4.17 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 6.42 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, bass-reflex |
| Country | - | United Kingdom (design) |
Related Speaker Comparisons
More worthwhile head-to-heads for Klipsch RP-600M II: