Will the TX-NR6100 damage the CDT-3650-C II?

No. The TX-NR6100 is rated for the CDT-3650-C II's 8 Ω load as it comes.

What impedance setting should I use for the CDT-3650-C II on the TX-NR6100?

None: the CDT-3650-C II is 8 Ω, and the TX-NR6100 needs no change for it.

Is the TX-NR6100 powerful enough for the CDT-3650-C II?

More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 7 W per speaker, and the TX-NR6100 is rated 100 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Does the Klipsch CDT-3650-C II work with the Onkyo TX-NR6100?

Verdict

Yes

The CDT-3650-C II is 8 Ω, and the TX-NR6100 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 7 W gives 95 dB peaks at 2 m

Height decoding

Yes

Dolby Atmos and DTS:X

How to connect them

Connect the CDT-3650-C II speakers to the TX-NR6100's height terminals with speaker wire.
Run AccuEQ with its microphone at your seat.

Plan the CDT-3650-C II and TX-NR6100 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-3650-C II

Impedance: 8 Ω
Sensitivity: 93 dB (2.83 V, 1 m)
MSRP: $125 each (MSRP, September 2026)

All CDT-3650-C II specs and pairings

Onkyo TX-NR6100

Amplifier channels: 7
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $799 each (MSRP, May 2025)

All TX-NR6100 specs and pairings

Questions about the CDT-3650-C II and TX-NR6100

Does the CDT-3650-C II work with the TX-NR6100?: Yes. The CDT-3650-C II is 8 Ω, and the TX-NR6100 is rated for speakers down to 4 Ω, so it drives them as is.
Will the TX-NR6100 damage the CDT-3650-C II?: No. The TX-NR6100 is rated for the CDT-3650-C II's 8 Ω load as it comes.
What impedance setting should I use for the CDT-3650-C II on the TX-NR6100?: None: the CDT-3650-C II is 8 Ω, and the TX-NR6100 needs no change for it.
Is the TX-NR6100 powerful enough for the CDT-3650-C II?: More than you need. From a seat 2 m away, loud 95 dB movie peaks take about 7 W per speaker, and the TX-NR6100 is rated 100 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Swap one of them

References

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

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