The sound coming out of the surround sound speakers sounds like it is under water,but sounds great on 2 channel mode

If you are in Pro Logic mode and play a stereo recording/film etc, there will be no rear sound.
You need a Pro Logic recording to produce true rear sound.

Make sure your receiver is in surround sound mode on the sound fields for that input. Some receivers have independent sound mode settings. example would be hdmi 1 is set to 2 channel stereo while hdmi 2 is set to PL II movie which is a surround sound setting. Hope this helps.

I’m happy to help further over the phone at https://www.6ya.com/expert/brandon_60dfebff379d64bd

there are 2 channel modes on your reciever, as well as surround modes, and it sounds like you have changed modes by accident. just open the little door on the front, and take it out of 2 channel mode

check speaker conections. disconnect all the speaker wires and use one speaker that you know that works and connect it to each channel one at a time. most surround sound stereos will not go into surround mode unless all the speakers are connected so make sure stereo is in 2 channel mode to start testing. check all fuses sometimes amp fuse is seperate from power circuit and denon uses relays in 99% of thier units.

Hi bud , What your laptop has is a 2.1 Channel Sound card , and your speakers are a 5.1 Channel Surround Sound system ...So in order to get the Real pure surround sound , Sound out of the speakers you will need to buy a 5.1 Channel Sound card...
Hope you come right bud
happy new year :)

Check in speaker setup menu that your rear surround channels are enabled.

I had this problem too. Finally, after using the MCACC setup and making sure all the speakers worked, I found I had to set the source to FM, TV or whatever from the remote control and set the mode to advanced surround sound using the front panal button on the upper right. Had to fool with them a lot. Good luck.

unit needs repair. Look at the b speakers. Conect a speaker or two to the B position. If you have no sound than your surrond sound is ok and the unit is bad. Sound comes directly into the b speaker and not threw the surrond system. My 6070 has a cold start up problem. no sound. time to purchase a new one. to costly to repair.

Unhook your center channel speaker and see if it still goes into protect.You might have bad center speaker