happs

thanks for the reply

we also bought 9 cards from a seller

the seller claims that this HISS/CRACKLING sound is due to mismatche polary
do you agree?

they say there are some blue/white wires that need to be played with to change the polarity and the sound will go off

all old model cards work fine....do you think the new cards would work by modifying the polarity...

thanks once again