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This weekend my 08 SG Harmon Kardon seems like it went into "protect" mode or something. It only goes to about 2/3 volume, I try and turn it up loader and it stays at that lower volume????
take it back to the dealer. its a common problem with the h/k radios. if its under warrenty get another radio. unfortunately the refurbs arent much better than the new ones
I have the main fuse pulled as we speak trying to reset it. If I spend any money on this it will be getting a new head unit and amp, not another crappy HK...