Will the BasX A-700 damage the Motion AFX?

No. The BasX A-700 is rated for the Motion AFX's 4 Ω load as it comes.

What impedance setting should I use for the Motion AFX on the BasX A-700?

None: the Motion AFX is 4 Ω, and the BasX A-700 needs no change for it.

Is the BasX A-700 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 BasX A-700 is rated 110 W per channel. Cinema reference level, 105 dB peaks, takes about 504 W.

Does the MartinLogan Motion AFX work with the Emotiva BasX A-700?

Verdict

Yes

The Motion AFX is 4 Ω, and the BasX A-700 is rated for speakers down to 4 Ω, so it drives them as is.

Speaker load

4 Ω speaker, rated down to 4 Ω

Power

110 W

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

How to connect them

Connect the BasX A-700's inputs to the pre-outs of your receiver or processor: a power amplifier has no volume control of its own.
Connect each Motion AFX to one of the BasX A-700's channels with speaker wire.

Plan the Motion AFX and BasX A-700 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

Emotiva BasX A-700

Channels: 7
Lowest impedance: 4 Ω
MSRP: $501 each (MSRP, April 2024)

All BasX A-700 specs and pairings

Questions about the Motion AFX and BasX A-700

Does the Motion AFX work with the BasX A-700?: Yes. The Motion AFX is 4 Ω, and the BasX A-700 is rated for speakers down to 4 Ω, so it drives them as is.
Will the BasX A-700 damage the Motion AFX?: No. The BasX A-700 is rated for the Motion AFX's 4 Ω load as it comes.
What impedance setting should I use for the Motion AFX on the BasX A-700?: None: the Motion AFX is 4 Ω, and the BasX A-700 needs no change for it.
Is the BasX A-700 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 BasX A-700 is rated 110 W per channel. Cinema reference level, 105 dB peaks, takes about 504 W.

Swap one of them

MartinLogan Motion AFX + Yamaha RX500ANeeds a setting change
MartinLogan Motion AFX + Denon AVR-S670HNot recommended
Klipsch RP-500M II + Emotiva BasX A-700Works
JBL Stage 250B + Emotiva BasX A-700Works

References

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

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