Will the AVR-X3800H damage the Q350?

No. The AVR-X3800H is rated for the Q350's 8 Ω load as it comes.

What impedance setting should I use for the Q350 on the AVR-X3800H?

None: the Q350 is 8 Ω, and the AVR-X3800H needs no change for it.

Is the AVR-X3800H powerful enough for the Q350?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the AVR-X3800H is rated 105 W per channel. Cinema reference level, 105 dB peaks, takes about 253 W.

Does the KEF Q350 work with the Denon AVR-X3800H?

Verdict

Yes

The Q350 is 8 Ω, and the AVR-X3800H 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

105 W

More than you need. About 26 W gives 95 dB peaks at 2 m

How to connect them

Connect the Q350 speakers to the AVR-X3800H's front terminals with speaker wire.
Run Audyssey MultEQ XT32 with its microphone at your seat.

Plan the Q350 and AVR-X3800H 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

KEF Q350

Impedance: 8 Ω
Sensitivity: 87 dB (2.83 V, 1 m)
Recommended amplifier power: 15–120 W
MSRP: $800 a pair (MSRP, August 2025)

All Q350 specs and pairings

Denon AVR-X3800H

Amplifier channels: 9
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $1,799 each (MSRP, September 2026)

All AVR-X3800H specs and pairings

Questions about the Q350 and AVR-X3800H

Does the Q350 work with the AVR-X3800H?: Yes. The Q350 is 8 Ω, and the AVR-X3800H is rated for speakers down to 4 Ω, so it drives them as is.
Will the AVR-X3800H damage the Q350?: No. The AVR-X3800H is rated for the Q350's 8 Ω load as it comes.
What impedance setting should I use for the Q350 on the AVR-X3800H?: None: the Q350 is 8 Ω, and the AVR-X3800H needs no change for it.
Is the AVR-X3800H powerful enough for the Q350?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the AVR-X3800H is rated 105 W per channel. Cinema reference level, 105 dB peaks, takes about 253 W.

Swap one of them

KEF Q350 + Emotiva XPA-2 Gen3Works
KEF Q350 + Marantz Cinema 70sWorks
KEF Q750 + Denon AVR-X3800HWorks
Bowers & Wilkins 606 S3 + Denon AVR-X3800HWorks

References

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

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