Will the AVR-S670H damage the Motion AFX?

No. Without Dolby Atmos or DTS:X decoding, the AVR-S670H simply has no height channel to send to the Motion AFX.

What impedance setting should I use for the Motion AFX on the AVR-S670H?

None: the Motion AFX is 4 Ω, and the AVR-S670H needs no change for it.

Is the AVR-S670H powerful enough for the Motion AFX?

Comfortable. From a seat 2 m away, loud 95 dB movie peaks take about 51 W per speaker, and the AVR-S670H is rated 75 W per channel. Cinema reference level, 105 dB peaks, takes about 504 W.

Does the MartinLogan Motion AFX work with the Denon AVR-S670H?

Verdict

Not recommended

Denon AVR-S670H has no Dolby Atmos or DTS:X decoding for height speakers. Choose a receiver with Dolby Atmos.

Speaker load

4 Ω speaker, rated down to 4 Ω

Power

75 W

Comfortable. About 51 W gives 95 dB peaks at 2 m

Height decoding

No Dolby Atmos or DTS:X

What works instead

Choose a receiver with Dolby Atmos. These receivers near the AVR-S670H's price do work with the Motion AFX.

Plan the Motion AFX and AVR-S670H in your own room.

Draw your room in 3D, place both, and see every connection checked and how loud they play at your seat. Designing is free.

Build it in your room

The specs that decide it

MartinLogan Motion AFX

Impedance: 4 Ω
Sensitivity: 87 dB (2.83 V, 1 m)
Recommended amplifier power: 20–200 W
MSRP: $600 a pair (MSRP, September 2026)

All Motion AFX specs and pairings

Denon AVR-S670H

Amplifier channels: 5
Height formats: None
Lowest speaker impedance: 4 Ω
MSRP: $649 each (MSRP, September 2026)

All AVR-S670H specs and pairings

Questions about the Motion AFX and AVR-S670H

Does the Motion AFX work with the AVR-S670H?: Not recommended. Denon AVR-S670H has no Dolby Atmos or DTS:X decoding for height speakers. Choose a receiver with Dolby Atmos.
Will the AVR-S670H damage the Motion AFX?: No. Without Dolby Atmos or DTS:X decoding, the AVR-S670H simply has no height channel to send to the Motion AFX.
What impedance setting should I use for the Motion AFX on the AVR-S670H?: None: the Motion AFX is 4 Ω, and the AVR-S670H needs no change for it.
Is the AVR-S670H powerful enough for the Motion AFX?: Comfortable. From a seat 2 m away, loud 95 dB movie peaks take about 51 W per speaker, and the AVR-S670H is rated 75 W per channel. Cinema reference level, 105 dB peaks, takes about 504 W.

Swap one of them

MartinLogan Motion AFX + Denon AVR-X1700HNeeds a setting change
MartinLogan Motion AFX + Monoprice M7100XWorks
Klipsch RP-500SA II + Denon AVR-S670HWorks
Klipsch RP-500M II + Denon AVR-S670HWorks

References

Specs verified against the manufacturer's published data. Last checked September 15, 2026.

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