Connecting MacBook to Klipsch RP-600M II via Denon AVR-S570BT Receiver
Yes. The AVR-S570BT into the Reference Premiere RP-600M II stays inside the amplifier's impedance rating. Those are the published figures. Published specs.
The Denon AVR-S570BT is a fair match for the Klipsch Reference Premiere RP-600M II. The nominal impedance is inside the amplifier's rating, which is the condition that matters.
At 2.5 m in a typical room, the stereo pair reaches about 111.0 dB. The second speaker and the room each contribute roughly 3 dB, which is the usual allowance for home listening. That leaves 6.0 dB before a 105 dB theatrical peak.
Behind that level: the AVR-S570BT is rated 70 W into 8 Ω, and the Reference Premiere RP-600M II works out to about 94.5 dB for 1 W at 1 m from the sensitivity the maker actually published. Nominal impedance is 8 Ω.
An amplifier rated above the speaker is not automatically dangerous. Clipping from too little power is what sends extra energy into the tweeter. Keep the volume clean, and treat an unpublished impedance dip as unknown rather than as a guessed fraction of the nominal.