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It might be clipping so just try turning it down. If you usually listen to it loud it might have blown though. The problem also might be your power supply if it cant keep up with the power needed for the speaker
Protected in short means that the amp is no longer powering the speakers due to one of the following:
1. Volume is up too loud
2. Equipment Failure
3. Dirty power
Turn amp on by pressing the function button on the remote of a source that has nothing on it or is not powered on. If it still says PROTECTED even though you are on a source with no sound coming in, then the equipment is in need of repair. If it simply comes on normal displaying the source turn the volume down till it says MIN. Find the range of your speaker and amp power by selecting a source with music or movie audio and slowly turn it up till either its too loud or says protected. Be sure to double check all speakers and wires to ensure wire integrity as well as proper connection.
To everyone having sound trouble... there is a solution! First make sure your TV is OFF. Unplugg the 2 main cables going into the DVT 412 for 30 seconds. Then re-plugg them. Press down for a few seconds on all the BLACK tabs connecting the sound wires and release. Without a disc in the player... and the TV still OFF, turn the power on and immediatley hold the down the STOP button on the DVT412 for 5-10 seconds. Your picture, vocal and backround sound will return to normal. Feel free to make changes to the sound now! Happy tuning... GO STEELERS! LOL!