Will the AVR-S770H damage the CDT-5650-C II?

No. The AVR-S770H is rated for the CDT-5650-C II's 8 Ω load as it comes.

What impedance setting should I use for the CDT-5650-C II on the AVR-S770H?

None: the CDT-5650-C II is 8 Ω, and the AVR-S770H needs no change for it.

Is the AVR-S770H powerful enough for the CDT-5650-C II?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 6 W per speaker, and the AVR-S770H is rated 75 W per channel. Cinema reference level, 105 dB peaks, takes about 51 W.

Does the Klipsch CDT-5650-C II work with the Denon AVR-S770H?

Verdict

Yes

The CDT-5650-C II is 8 Ω, and the AVR-S770H 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

75 W

More than you need. About 6 W gives 95 dB peaks at 2 m

Height decoding

Yes

Dolby Atmos and DTS:X

How to connect them

Connect the CDT-5650-C II speakers to the AVR-S770H's height terminals with speaker wire.
Run Audyssey MultEQ with its microphone at your seat.

Plan the CDT-5650-C II and AVR-S770H 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

Klipsch CDT-5650-C II

Impedance: 8 Ω
Sensitivity: 94 dB (2.83 V, 1 m)
MSRP: $125 each (MSRP, September 2026)

All CDT-5650-C II specs and pairings

Denon AVR-S770H

Amplifier channels: 7
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $749 each (MSRP, September 2026)

All AVR-S770H specs and pairings

Questions about the CDT-5650-C II and AVR-S770H

Does the CDT-5650-C II work with the AVR-S770H?: Yes. The CDT-5650-C II is 8 Ω, and the AVR-S770H is rated for speakers down to 4 Ω, so it drives them as is.
Will the AVR-S770H damage the CDT-5650-C II?: No. The AVR-S770H is rated for the CDT-5650-C II's 8 Ω load as it comes.
What impedance setting should I use for the CDT-5650-C II on the AVR-S770H?: None: the CDT-5650-C II is 8 Ω, and the AVR-S770H needs no change for it.
Is the AVR-S770H powerful enough for the CDT-5650-C II?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 6 W per speaker, and the AVR-S770H is rated 75 W per channel. Cinema reference level, 105 dB peaks, takes about 51 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.