Will the Cinema 70s damage the Lumina I?

No. The Cinema 70s is rated for the Lumina I's 4 Ω load as it comes.

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

None: the Lumina I is 4 Ω, and the Cinema 70s needs no change for it.

Is the Cinema 70s powerful enough for the Lumina I?

Too weak. From a seat 2 m away, loud 95 dB movie peaks take about 101 W per speaker, and the Cinema 70s is rated 50 W per channel. Cinema reference level, 105 dB peaks, takes about 1005 W.

Does the Sonus faber Lumina I work with the Marantz Cinema 70s?

Verdict

Yes

The Lumina I is 4 Ω, and the Cinema 70s is rated for speakers down to 4 Ω, so it drives them as is.

Speaker load

4 Ω speaker, rated down to 4 Ω

Power

50 W

Too weak. About 101 W gives 95 dB peaks at 2 m

How to connect them

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

Plan the Lumina I 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

Sonus faber Lumina I

Impedance: 4 Ω
Sensitivity: 84 dB (2.83 V, 1 m)
Recommended amplifier power: 30–100 W
MSRP: $1,200 a pair (MSRP, September 2026)

All Lumina I 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 Lumina I and Cinema 70s

Does the Lumina I work with the Cinema 70s?: Yes. The Lumina I is 4 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 Lumina I?: No. The Cinema 70s is rated for the Lumina I's 4 Ω load as it comes.
What impedance setting should I use for the Lumina I on the Cinema 70s?: None: the Lumina I is 4 Ω, and the Cinema 70s needs no change for it.
Is the Cinema 70s powerful enough for the Lumina I?: Too weak. From a seat 2 m away, loud 95 dB movie peaks take about 101 W per speaker, and the Cinema 70s is rated 50 W per channel. Cinema reference level, 105 dB peaks, takes about 1005 W.

Swap one of them

References

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

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