Hi Anonymous, try disconnecting the speakers and turning on your HT-C550, if it works and does not go to PROT, it means that the problem would be in the speakers or the cables, control the cables that are not damaged and go connecting one by one the speakers and turn on, to control which one may be wrong
The output of the Samsung could also be wrong
Try and comment
Greetings Franco Dosil
Hola Anonymous, prueba desconectar los parlantes y encender tu HT-C550, si funciona y no se pone en PROT, quiere decir que el problema estaria en los parlantes o los cables, controla los cables que no se encuentren da?ados y ve conectando de a uno los parlantes y enciende, para controlar cual puede estar mal
Tambien podria estar mal la salida del Samsung
Prueba y comenta
Saludos Franco Dosil

http://www.samsungparts.com/Products/Parts_and_Accessories/HT-C550/XAA/Default.aspx

Protection mode. look for shorted speaker output, or too muchoutput load (low Ohms, below 3-4)