KEF LS50 Meta vs MartinLogan Motion XT B100
The KEF LS50 Meta is an easier load for a receiver (8 Ω vs 4 Ω). The MartinLogan Motion XT B100 is more sensitive (93 dB vs 85 dB), so it plays louder per watt, plays lower (45 Hz vs 79 Hz) and costs less ($850 vs $1,600).
What each one works with
Checked against every product in our catalogue by the same engine as the compatibility checker.
| LS50 Meta | Motion XT B100 | |
|---|---|---|
| Receivers and amps that drive it | 29 of 29 | 28 of 29, 14 after a setting change |
Specs side by side
Values that differ are bold. A dash means that model doesn't publish the spec.
| LS50 Meta | Motion XT B100 | |
|---|---|---|
| Impedance | 8 Ω | 4 Ω |
| Sensitivity | 85 dB (2.83 V, 1 m) | 93 dB |
| Low end | 79 Hz | 45 Hz |
| Drivers | 1 × 25 mm, 1 × 130 mm | 1 × 32 mm, 1 × 165 mm |
| Size | 8×12×11 in | 8×14×13 in |
| Recommended amplifier power | 40–100 W | 20–250 W |
| Weight | 7.8 kg (17.2 lb) | 9.3 kg (20.5 lb) |
| MSRP | $1,600 a pair (MSRP, September 2026) | $850 each (MSRP, September 2026) |
Every spec and pairing: KEF LS50 Meta, MartinLogan Motion XT B100.
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References
- KEF LS50 Meta: Spec sheet, assets.kef.com, retrieved September 15, 2026
- KEF LS50 Meta: Owner's manual, assets.kef.com, retrieved September 15, 2026
- KEF LS50 Meta: Manufacturer product page, us.kef.com, retrieved September 15, 2026
- MartinLogan Motion XT B100: Spec sheet, martinlogan.com, retrieved September 15, 2026
- MartinLogan Motion XT B100: Retailer listing, audioadvice.com, retrieved September 15, 2026
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