op the marantz even n a pure mode will not sound as good as a real high end preamp Marantz is re badged denon and these mass market components will not compare to a preamp like a cj or hegel
if you really want to elevate your system get a hegel integrated amp to power your mains with the home theater bypass to connect your marantz
Dave and Troy
Audio intellect NJ
Home theater and two channel specialists