The WPC of your amp has no bearing on the level.
How do you have the components connected? Make sure you are using the preamp RCA outputs on the Decco to the amp. Make sure the amp is set for stereo and all connections are correct. The speakers must be connected to the Adcom. Make sure the Direct TV box is turned up all of the way if it has a volume control.
How do you have the components connected? Make sure you are using the preamp RCA outputs on the Decco to the amp. Make sure the amp is set for stereo and all connections are correct. The speakers must be connected to the Adcom. Make sure the Direct TV box is turned up all of the way if it has a volume control.