Will the TX-RZ30 damage the Q250c?

No. The TX-RZ30 is rated for the Q250c's 8 Ω load as it comes.

What impedance setting should I use for the Q250c on the TX-RZ30?

None: the Q250c is 8 Ω, and the TX-RZ30 needs no change for it.

Is the TX-RZ30 powerful enough for the Q250c?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the TX-RZ30 is rated 100 W per channel. Cinema reference level, 105 dB peaks, takes about 253 W.

Does the KEF Q250c work with the Onkyo TX-RZ30?

Verdict

Yes

The Q250c is 8 Ω, and the TX-RZ30 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

100 W

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

How to connect them

Connect the Q250c speakers to the TX-RZ30's front terminals with speaker wire.
Run Dirac Live with its microphone at your seat.

Plan the Q250c and TX-RZ30 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 Q250c

Impedance: 8 Ω
Sensitivity: 87 dB (2.83 V, 1 m)
Recommended amplifier power: 10–100 W
MSRP: $600 each (MSRP, October 2025)

All Q250c specs and pairings

Onkyo TX-RZ30

Amplifier channels: 9
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $1,000 each (MSRP, September 2025)

All TX-RZ30 specs and pairings

Questions about the Q250c and TX-RZ30

Does the Q250c work with the TX-RZ30?: Yes. The Q250c is 8 Ω, and the TX-RZ30 is rated for speakers down to 4 Ω, so it drives them as is.
Will the TX-RZ30 damage the Q250c?: No. The TX-RZ30 is rated for the Q250c's 8 Ω load as it comes.
What impedance setting should I use for the Q250c on the TX-RZ30?: None: the Q250c is 8 Ω, and the TX-RZ30 needs no change for it.
Is the TX-RZ30 powerful enough for the Q250c?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the TX-RZ30 is rated 100 W per channel. Cinema reference level, 105 dB peaks, takes about 253 W.

Swap one of them

KEF Q250c + Denon AVR-S970HWorks
KEF Q250c + Onkyo TX-NR7100Works
ELAC DF63 + Onkyo TX-RZ30Needs a setting change
JBL Stage 260F + Onkyo TX-RZ30Works

References

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

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