A:AnswerThe Denon AVR 1913 would be better suited for the RP-6000F (II), since this AVR will supply ~90 Watts per channel at 8 Ohms.
For the RP-8000F II speakers, you would need a receiver/amplifier that supplies closer to 150 Watts per channel at 8 Ohms.
A:AnswerWe recommend a receiver/amplifier that supplies power closer to the RP-8060FA's power handling (150 Watts at 8 Ohms).
The Denon AVR S760H would be better suited with the RP-6000F (II) or the RP-5000F (II).
The RP-8060FA will have a good amount of low-end or bass response. That being said, a subwoofer is always a wise addition to a home theater set-up because it can reach those deep bass tones, which are essential when watching movies or listening to music with a lot of range.
A:AnswerFrom what I found online, the Marantz Cinema 50 receiver supplies 110 watts per channel into 8 ohms (20-20,000 Hz) at 0.08% THD, with 2 channels driven. This will be a bit short of the recommend amplifier power for the RP-8060FA speakers, which have a power handling of 150 Watts at 8 Ohms. We recommend a receiver/amplifier with close to 150 Watts per channel at 8 Ohms.