Will the Cinema 70s damage the Q250c?

No. The Cinema 70s is rated for the Q250c's 8 Ω load as it comes.

What impedance setting should I use for the Q250c on the Cinema 70s?

None: the Q250c is 8 Ω, and the Cinema 70s needs no change for it.

Is the Cinema 70s powerful enough for the Q250c?

Comfortable. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the Cinema 70s is rated 50 W per channel. Cinema reference level, 105 dB peaks, takes about 253 W.

Does the KEF Q250c work with the Marantz Cinema 70s?

Verdict

Yes

The Q250c is 8 Ω, and the Cinema 70s 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

50 W

Comfortable. About 26 W gives 95 dB peaks at 2 m

How to connect them

Connect the Q250c speakers to the Cinema 70s's front terminals with speaker wire.
Run Audyssey MultEQ XT with its microphone at your seat.

Plan the Q250c and Cinema 70s 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

Marantz Cinema 70s

Amplifier channels: 7
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $1,300 each (MSRP, September 2026)

All Cinema 70s specs and pairings

Questions about the Q250c and Cinema 70s

Does the Q250c work with the Cinema 70s?: Yes. The Q250c is 8 Ω, and the Cinema 70s is rated for speakers down to 4 Ω, so it drives them as is.
Will the Cinema 70s damage the Q250c?: No. The Cinema 70s is rated for the Q250c's 8 Ω load as it comes.
What impedance setting should I use for the Q250c on the Cinema 70s?: None: the Q250c is 8 Ω, and the Cinema 70s needs no change for it.
Is the Cinema 70s powerful enough for the Q250c?: Comfortable. From a seat 2 m away, loud 95 dB movie peaks take about 26 W per speaker, and the Cinema 70s is rated 50 W per channel. Cinema reference level, 105 dB peaks, takes about 253 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.