Will the XPA-2 Gen3 damage the Reserve R400?

No. The XPA-2 Gen3 is rated for the Reserve R400's 8 Ω load as it comes.

What impedance setting should I use for the Reserve R400 on the XPA-2 Gen3?

None: the Reserve R400 is 8 Ω, and the XPA-2 Gen3 needs no change for it.

Is the XPA-2 Gen3 powerful enough for the Reserve R400?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 16 W per speaker, and the XPA-2 Gen3 is rated 300 W per channel. Cinema reference level, 105 dB peaks, takes about 160 W.

Does the Polk Reserve R400 work with the Emotiva XPA-2 Gen3?

Verdict

Yes

The Reserve R400 is 8 Ω, and the XPA-2 Gen3 is rated for speakers down to 4 Ω, so it drives them as is.

Speaker load

8 Ω speaker, rated down to 4 Ω

Power

300 W

More than you need. About 16 W gives 95 dB peaks at 2 m

How to connect them

Connect the XPA-2 Gen3's inputs to the pre-outs of your receiver or processor: a power amplifier has no volume control of its own.
Connect each Reserve R400 to one of the XPA-2 Gen3's channels with speaker wire.

Plan the Reserve R400 and XPA-2 Gen3 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

Polk Reserve R400

Impedance: 8 Ω
Sensitivity: 89 dB (2.83 V, 1 m)
Recommended amplifier power: 40–200 W
MSRP: $699 each (MSRP, September 2026)

All Reserve R400 specs and pairings

Emotiva XPA-2 Gen3

Channels: 2
Lowest impedance: 4 Ω
MSRP: $1,499 each (MSRP, September 2026)

All XPA-2 Gen3 specs and pairings

Questions about the Reserve R400 and XPA-2 Gen3

Does the Reserve R400 work with the XPA-2 Gen3?: Yes. The Reserve R400 is 8 Ω, and the XPA-2 Gen3 is rated for speakers down to 4 Ω, so it drives them as is.
Will the XPA-2 Gen3 damage the Reserve R400?: No. The XPA-2 Gen3 is rated for the Reserve R400's 8 Ω load as it comes.
What impedance setting should I use for the Reserve R400 on the XPA-2 Gen3?: None: the Reserve R400 is 8 Ω, and the XPA-2 Gen3 needs no change for it.
Is the XPA-2 Gen3 powerful enough for the Reserve R400?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 16 W per speaker, and the XPA-2 Gen3 is rated 300 W per channel. Cinema reference level, 105 dB peaks, takes about 160 W.

Swap one of them

References

Specs verified against the manufacturer's published data. Last checked 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.