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MartinLogan Motion AFX

Motion series

The MartinLogan Motion AFX is a height speaker with 4 Ω impedance and 87 dB sensitivity. 27 of the 29 receivers and amps in our catalogue can drive it, 13 of them once set to 4 Ω.

Impedance
4 Ω
What the receiver must be rated for
Sensitivity
87 dB
Higher is louder per watt
Amplifier power
20–200 W
MartinLogan's recommendation
Bass extension
90 Hz
How low it plays

$600 a pair (MSRP, September 2026)

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3D model of the MartinLogan Motion AFX

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Which receivers and amps can drive it?

What decides it is impedance: the Motion AFX is 4 Ω, and the receiver or amp has to be rated for that, and as a height speaker it needs Dolby Atmos or DTS:X decoding.

  • Works

    Receivers and amps rated for 4 Ω

    14 in our catalogue

  • Needs a setting change

    Receivers with a 4 Ω setting

    Set the receiver to 4 Ω in its speaker setup.

    13 in our catalogue

  • Not recommended

    Receivers without Dolby Atmos or DTS:X

    A height speaker needs one that decodes them.

    2 in our catalogue

In its price range

All 29 receivers and amps we checked

Works14

Needs a setting change13

Set the receiver to 4 Ω in its speaker setup.

Not recommended2

  • Denon AVR-S570BT

    MartinLogan Motion AFX is 4 Ω; Denon AVR-S570BT supports 6 Ω and up.

  • Denon AVR-S670H

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

Plan your room around the Motion AFX.

Draw your room in 3D, place the Motion AFX and see how they sound at your seat, with every connection to your receiver checked. Designing is free.

Build it in your room

Motion AFX specifications

Impedance
4 Ω
Sensitivity
87 dB (2.83 V, 1 m)
Low end
90 Hz
Drivers
1 × 19 mm, 1 × 133 mm
Size
8×7×10 in
Recommended amplifier power
20–200 W
Weight
3.6 kg (7.9 lb)
MSRP
$600 a pair (MSRP, September 2026)

Every value comes from the sources under References, last retrieved September 15, 2026. To check it against the rest of your system, use the compatibility checker.

Questions about the Motion AFX

What receiver do I need for the Motion AFX?
One rated for 4 Ω speakers. In our catalogue, Emotiva BasX A-700, Monoprice M7100X and Onkyo TX-NR6100 are rated to drive it. Yamaha RX500A, Denon AVR-X1700H and Denon AVR-S770H work once the receiver's impedance setting is changed to 4 Ω. Denon AVR-S570BT and Denon AVR-S670H are not rated for it.
Is the Motion AFX 4 ohm or 8 ohm?
The MartinLogan Motion AFX has a nominal impedance of 4 Ω. Use a receiver or amplifier rated down to 4 Ω or lower.
How much power does the Motion AFX need?
MartinLogan recommends an amplifier of 20–200 W. Its sensitivity is 87 dB (2.83 V, 1 m). How much of that you use depends on how far you sit and how loud you listen, which the 3D editor works out for your room.
How low does the Motion AFX go?
The MartinLogan Motion AFX is rated down to 90 Hz. Below that, a subwoofer takes over; where the bass actually lands depends on your room's modes.
How big is the Motion AFX?
The MartinLogan Motion AFX measures 196 × 173 × 254 mm (7.7 × 6.8 × 10 in, width × height × depth) and weighs 3.6 kg (7.9 lb).

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References

  1. MartinLogan Motion AFX: Spec sheet, martinlogan.com, retrieved September 15, 2026
  2. MartinLogan Motion AFX: Retailer listing, audioadvice.com, retrieved September 15, 2026

Brand names are trademarks of their owners. Not affiliated with or endorsed by any manufacturer. 3D models are our approximations. Prices are manufacturer list prices (MSRP) as of the month shown. How we earn from buy links: affiliate disclosure.