Peachtree Decco Preamp Issue????

Ok, so I'm having some issues with my Decco.

I just purchased an Adcom GFA 555 and it's not pairing with the Decco for some reason.

The sound is great...I just have to turn the volume pod WAY up in order for it to play at ejoyable levels.

I'm very confused as this is a 200wpc amp so I shouldn't have to turn it up as loud as I am?!?

I can turn the volume all the way up and it doesn't even clip?!?

The PC USB source sounds the best however the DirecTV coaxial connection plays at even lower volumes.

Could some help please?

Thank You!

Newbie