Hello I have doubts regarding the impedance of the Subwoofer of this equipment, since on the back of the speaker it is clearly indicated that it says IMPEDANCE: 12 ohms but when measuring with a multimeter on the ohms scale it measures me a value of 4 ohms approximately. Therefore, the following questions arise: Could the speaker be in a partial short? In addition, another test I did was to touch the ends of the speaker cable with the terminals of a 9v battery and no noise is heard or the speaker membrane moves. Another important fact is that the equipment is put in PROTECTION MODE, with or without a speaker. Could it be that the speaker shorted the integrated STK 282 270 ?. Of course, thank you very much to everyone!

Hello, with respect to the speaker you will have to disassemble it and you can try a 3v pc battery in its terminals, this will make the cone move, but it does it because it is wrong. In the amplifier it may be shorted and dropping dc voltage so it is set to Protection.