If the Adcom 5 channels , is used for surrounds speakers , keep it.
The front and center channels are the most important. They deserve a good
power amp.
This is my opinion.
@auxinput Is better than me for this matter.
But for 2 channels music , a home theater processor , will not give you the same musicality than a preamplifier or a integrated amplifier.
They are not dedicated for the same use