KEF Q350 vs MartinLogan Motion XT B100
The KEF Q350 is an easier load for a receiver (8 Ω vs 4 Ω) and costs less ($800 vs $850). The MartinLogan Motion XT B100 is more sensitive (93 dB vs 87 dB), so it plays louder per watt and plays lower (45 Hz vs 63 Hz).
What each one works with
Checked against every product in our catalogue by the same engine as the compatibility checker.
| Q350 | 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.
| Q350 | Motion XT B100 | |
|---|---|---|
| Impedance | 8 Ω | 4 Ω |
| Sensitivity | 87 dB (2.83 V, 1 m) | 93 dB |
| Low end | 63 Hz | 45 Hz |
| Drivers | 1 × 25 mm, 1 × 165 mm | 1 × 32 mm, 1 × 165 mm |
| Size | 8×14×12 in | 8×14×13 in |
| Recommended amplifier power | 15–120 W | 20–250 W |
| Weight | 7.6 kg (16.8 lb) | 9.3 kg (20.5 lb) |
| MSRP | $800 a pair (MSRP, August 2025) | $850 each (MSRP, September 2026) |
Every spec and pairing: KEF Q350, MartinLogan Motion XT B100.
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References
- KEF Q350: Owner's manual, assets.kef.com, retrieved September 15, 2026
- KEF Q350: Manufacturer product page, web.archive.org, 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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