Will the VSX-LX505 damage the Motion XT B100?

No. The VSX-LX505 is rated for the Motion XT B100's 4 Ω load as it comes.

What impedance setting should I use for the Motion XT B100 on the VSX-LX505?

None: the Motion XT B100 is 4 Ω, and the VSX-LX505 needs no change for it.

Is the VSX-LX505 powerful enough for the Motion XT B100?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 7 W per speaker, and the VSX-LX505 is rated 120 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Does the MartinLogan Motion XT B100 work with the Pioneer VSX-LX505?

Verdict

Yes

The Motion XT B100 is 4 Ω, and the VSX-LX505 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

120 W

More than you need. About 7 W gives 95 dB peaks at 2 m

How to connect them

Connect the Motion XT B100 speakers to the VSX-LX505's front terminals with speaker wire.
Run Advanced MCACC with its microphone at your seat.

Plan the Motion XT B100 and VSX-LX505 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 XT B100

Impedance: 4 Ω
Sensitivity: 93 dB
Recommended amplifier power: 20–250 W
MSRP: $850 each (MSRP, September 2026)

All Motion XT B100 specs and pairings

Pioneer VSX-LX505

Amplifier channels: 9
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $1,399 each (MSRP, February 2025)

All VSX-LX505 specs and pairings

Questions about the Motion XT B100 and VSX-LX505

Does the Motion XT B100 work with the VSX-LX505?: Yes. The Motion XT B100 is 4 Ω, and the VSX-LX505 is rated for speakers down to 4 Ω, so it drives them as is.
Will the VSX-LX505 damage the Motion XT B100?: No. The VSX-LX505 is rated for the Motion XT B100's 4 Ω load as it comes.
What impedance setting should I use for the Motion XT B100 on the VSX-LX505?: None: the Motion XT B100 is 4 Ω, and the VSX-LX505 needs no change for it.
Is the VSX-LX505 powerful enough for the Motion XT B100?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 7 W per speaker, and the VSX-LX505 is rated 120 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Swap one of them

MartinLogan Motion XT B100 + Denon AVR-X2900HNeeds a setting change
MartinLogan Motion XT B100 + Emotiva XPA-2 Gen3Works
KEF Q6 Meta + Pioneer VSX-LX505Works
KEF Q750 + Pioneer VSX-LX505Works

References

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

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