The MartinLogan Motion XT B100 ranks #127 out of 203 total Large Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: MartinLogan
Prices on this page were last checked October 7, 2026 at 9:25 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.
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#127 MartinLogan Motion XT B100: $1,699.98 per pair MartinLogan Dealer Network eBay
Older model: the MartinLogan Motion 35XTi (ranked lower, estimated 3.4/5).
Same family: the MartinLogan Motion XT F100 (smaller floorstanding, estimated 3.9/5), the MartinLogan Motion XT F200 (larger floorstanding, estimated 4/5) and the MartinLogan Motion XT C100 (center, estimated 3.9/5).
Pros: A premium 6.5-inch standmount with MartinLogan’s large folded-motion tweeter and high rated sensitivity. Erin’s data predicts 55Hz in-room extension, a 6.35 subwoofer-assisted preference score and good 0.153 sound-power smoothness. Measured bass extension of 71.8Hz (-3dB).
Cons: 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. The cabinet is large, heavy and $850 per pair before stands.
| Bass Extension (-10dB) | 50.7Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 71.8Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Country | United States (design) |
| DIY Kit | No |
| Dimensions | 14.5H x 8W x 12.5D in |
| Drivers | 1.25 x 2.4” folded-motion XT tweeter, 6.5” Kevlar woofer |
| Enclosure | 2-way, rear-ported |
| Impedance | 4 ohms |
| Sensitivity | 93dB |
| Spinorama Preference Score | 3.83 |
| Spinorama Preference Score with Perfect Sub | 6.35 |
| Weight | 20.5 lbs (9.3 kg) each |
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