Klipsch R-40SA vs MartinLogan Motion AFX
The Klipsch R-40SA is an easier load for a receiver (8 Ω vs 4 Ω). The MartinLogan Motion AFX costs less ($600 vs $675).
What each one works with
Checked against every product in our catalogue by the same engine as the compatibility checker.
| R-40SA | Motion AFX | |
|---|---|---|
| Receivers and amps that drive it | 27 of 29 | 27 of 29, 13 after a setting change |
Specs side by side
Values that differ are bold. A dash means that model doesn't publish the spec.
| R-40SA | Motion AFX | |
|---|---|---|
| Impedance | 8 Ω | 4 Ω |
| Drivers | 1 × 25 mm, 1 × 102 mm | 1 × 19 mm, 1 × 133 mm |
| Size | 6×7×12 in | 8×7×10 in |
| Weight | 2.8 kg (6.2 lb) | 3.6 kg (7.9 lb) |
| MSRP | $675 a pair (MSRP, September 2026) | $600 a pair (MSRP, September 2026) |
| Sensitivity | — | 87 dB (2.83 V, 1 m) |
| Low end | — | 90 Hz |
| Recommended amplifier power | — | 20–200 W |
Every spec and pairing: Klipsch R-40SA, MartinLogan Motion AFX.
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References
- Klipsch R-40SA: Spec sheet, assets.klipsch.com, retrieved September 15, 2026
- Klipsch R-40SA: Retailer listing, bhphotovideo.com, retrieved September 15, 2026
- MartinLogan Motion AFX: Spec sheet, martinlogan.com, retrieved September 15, 2026
- MartinLogan Motion AFX: Retailer listing, audioadvice.com, retrieved September 15, 2026
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