Denim and Marantz do have a tendency towards getting warm, regardless of activity... Fans and room for the receiver to breathe is all you need.
With sensitive speakers like those Klipsch, about 92dB iirc from Shady’s review... you probably aren’t using more than 16 watts per channel.
But, you say you like it loud... so what SPL do you listen at? If you are listening at rock concert levels... then get some 300w per channel amps and call it a day.

Otherwise, that Denon should be able to handle those Klipsch speakers just fine.
(Don’t misunderstand, I have no problem with Amps... but i just don’t think you need it. To be sure, play with the
SPL calculator, and see what that tells you.)
