Hooking DishNetwork receiver to amp=speaker noise?

Likely a ground loop as stated by Kdbrink above. There are several solutions, but the easiest is the addition of a ground loop isolation box (like the Mondial Magic). They run about $80. Happy Listening.

Another vote for a ground loop issue. I have had my (various) Dish receivers hooked to my stereo for years and have never had any issues you speak of.

I have also used the digital out on the back of my Dish receiver and ran it to my DAC. The sound was a touch better, but nothing spectacular; I was using it for the satellite radio stations and they are compressed.

Are you using the antenna input on the Dish box?
If you are what is it?
I once used the antenna input for basic cable so when dish went out I still had channels I could watch.
I had to also install a Mondial Magic because of the hum when cable was connected.

If you have an optical input available, try that.

Optical won't complete the ground so no 'loop'.

Now, on the Dish receiver, go to the menu and 'system setup' than 'audio setup'.
Get rid of the night volume leveling and set output to PCM only.

I have had this same experience when directly connecting the audio out (L&R) from an aging 301 receiver. The condition was not appairent at first but presented itself after years of operation. After a little trial and error I found that it was an internal ground loop due to aging components in the Dish Receiver. The telling tell was that hum was present even if the Dish receiver was completely disconnected from everything. The moment I plugged in the interconnect cables from the intergrated amp into the Dish receiver, the hum was back.

I solved the problem by going to a new Dish 211k receiver with an optical output. As Brianmgrarcom said, the sound is better/acceptable, but not spectacular.