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 MartinLogan Motion XT B100 ranks #139, rated 3.6/5, and costs $1,359.98, which makes this an easy call rather than a real tradeoff.
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 3.83 for the MartinLogan Motion XT B100. The tradeoff: 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 MartinLogan Motion XT B100: Premium standmount speakers with a large folded-motion tweeter and high sensitivity that is easy to drive. The tradeoff: The measured response rises strongly at +0.84dB per octave and directivity-index consistency is a poor 4.34, so tonal balance and off-axis behavior are less neutral than the price implies.
Buy the Klipsch RP-600M II. It is rated higher for sound quality than the MartinLogan Motion XT B100 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Passive Home rankings cover every ranked option.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
Premium standmount speakers with a large folded-motion tweeter and high sensitivity that is easy to drive.
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 | MartinLogan Motion XT B100 | |
|---|---|---|
| Price | $449.99 per pair | $1,359.98 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #139 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 50.7Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 71.8Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 14.5H x 8W x 12.5D in |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 4 ohms |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 93dB |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 1.25 x 2.4” folded-motion XT tweeter, 6.5” Kevlar woofer |
| Weight | 13 lbs (5.9 kg) each | 20.5 lbs (9.3 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.64 | 3.83 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 6.35 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, rear-ported |
| Country | - | United States (design) |
Related Speaker Comparisons
More top alternatives to Klipsch RP-600M II: