Will the Cinema 50 damage the Q750?

No. The Cinema 50 is rated for the Q750's 8 Ω load as it comes.

What impedance setting should I use for the Q750 on the Cinema 50?

None: the Q750 is 8 Ω, and the Cinema 50 needs no change for it.

Is the Cinema 50 powerful enough for the Q750?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 21 W per speaker, and the Cinema 50 is rated 110 W per channel. Cinema reference level, 105 dB peaks, takes about 201 W.

Does the KEF Q750 work with the Marantz Cinema 50?

Verdict

Yes

The Q750 is 8 Ω, and the Cinema 50 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

110 W

More than you need. About 21 W gives 95 dB peaks at 2 m

How to connect them

Connect the Q750 speakers to the Cinema 50's front terminals with speaker wire.
Run Audyssey MultEQ XT32 with its microphone at your seat.

Plan the Q750 and Cinema 50 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 Q750

Impedance: 8 Ω
Sensitivity: 88 dB (2.83 V, 1 m)
Recommended amplifier power: 15–150 W
MSRP: $900 each (MSRP, January 2025)

All Q750 specs and pairings

Marantz Cinema 50

Amplifier channels: 9
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $2,800 each (MSRP, September 2026)

All Cinema 50 specs and pairings

Questions about the Q750 and Cinema 50

Does the Q750 work with the Cinema 50?: Yes. The Q750 is 8 Ω, and the Cinema 50 is rated for speakers down to 4 Ω, so it drives them as is.
Will the Cinema 50 damage the Q750?: No. The Cinema 50 is rated for the Q750's 8 Ω load as it comes.
What impedance setting should I use for the Q750 on the Cinema 50?: None: the Q750 is 8 Ω, and the Cinema 50 needs no change for it.
Is the Cinema 50 powerful enough for the Q750?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 21 W per speaker, and the Cinema 50 is rated 110 W per channel. Cinema reference level, 105 dB peaks, takes about 201 W.

Swap one of them

KEF Q750 + Denon AVR-X3800HWorks
KEF Q750 + Emotiva XPA-2 Gen3Works
KEF Q350 + Marantz Cinema 50Works
Klipsch RP-8000F II + Marantz Cinema 50Works

References

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

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