Will the RX500A damage the CDT-3650-C II?

No. The RX500A 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 RX500A?

None: the CDT-3650-C II is 8 Ω, and the RX500A needs no change for it.

Is the RX500A 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 RX500A is rated 70 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Does the Klipsch CDT-3650-C II work with the Yamaha RX500A?

Verdict

Yes

The CDT-3650-C II is 8 Ω, and the RX500A 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

70 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 RX500A's height terminals with speaker wire.
Run Room Correction with its microphone at your seat.

Plan the CDT-3650-C II and RX500A 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

Yamaha RX500A

Amplifier channels: 7
Height formats: Dolby Atmos, DTS:X
Lowest speaker impedance: 4 Ω
MSRP: $600 each (MSRP, May 2026)

All RX500A specs and pairings

Questions about the CDT-3650-C II and RX500A

Does the CDT-3650-C II work with the RX500A?: Yes. The CDT-3650-C II is 8 Ω, and the RX500A is rated for speakers down to 4 Ω, so it drives them as is.
Will the RX500A damage the CDT-3650-C II?: No. The RX500A 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 RX500A?: None: the CDT-3650-C II is 8 Ω, and the RX500A needs no change for it.
Is the RX500A 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 RX500A is rated 70 W per channel. Cinema reference level, 105 dB peaks, takes about 64 W.

Swap one of them

Klipsch CDT-3650-C II + Denon AVR-S670HNot recommended
Klipsch CDT-3650-C II + Denon AVR-X1700HWorks
Klipsch CDT-5650-C II + Yamaha RX500AWorks
JBL Stage 240B + Yamaha RX500AWorks

References

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

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