I am using the STB connected to my Samsung TV with the HDMI cable. But I have a very good pair of speakers, I want to use with the receiver. The main problem I have is when I connect the STB to the receiver with the red/white RCA audio jacks, the volume is minimal even with the volume turned up past 3 o'clock. They are plugged into an AUX input on the receiver, why is my volume so low?