Will the AVR-X2900H damage the Reserve R400?

No. The AVR-X2900H 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 AVR-X2900H?

None: the Reserve R400 is 8 Ω, and the AVR-X2900H needs no change for it.

Is the AVR-X2900H 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 AVR-X2900H is rated 95 W per channel. Cinema reference level, 105 dB peaks, takes about 160 W.

Does the Polk Reserve R400 work with the Denon AVR-X2900H?

Verdict

Yes

The Reserve R400 is 8 Ω, and the AVR-X2900H 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

95 W

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

How to connect them

Connect the Reserve R400 speakers to the AVR-X2900H's front terminals with speaker wire.
Run Audyssey MultEQ XT with its microphone at your seat.

Plan the Reserve R400 and AVR-X2900H 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

Denon AVR-X2900H

Amplifier channels: 7
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $1,349 each (MSRP, September 2026)

All AVR-X2900H specs and pairings

Questions about the Reserve R400 and AVR-X2900H

Does the Reserve R400 work with the AVR-X2900H?: Yes. The Reserve R400 is 8 Ω, and the AVR-X2900H is rated for speakers down to 4 Ω, so it drives them as is.
Will the AVR-X2900H damage the Reserve R400?: No. The AVR-X2900H 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 AVR-X2900H?: None: the Reserve R400 is 8 Ω, and the AVR-X2900H needs no change for it.
Is the AVR-X2900H 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 AVR-X2900H is rated 95 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.

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