berggei posted an answer for this Samsung Blu-ray Player 7.1 Ch Audio Out Mfr P/N BD-C6900/XAA:
"You must have a disc made to set the player as region free. It look like the link will..."
berggei posted an answer for this Harman Multimedia Harman Kardon HK 3490 Stereo Receiver:
"This amplifier can go into protection if one of the low ohm resistors on the power module..."