I just got a surround sound from my parents I have it connected to the TV through an aux to rca cable and then the TV to my laptop through hdmi. My question is for some reason my sub woofer and center speaker aren't working all other 4 speakers are. My receiver is a pioneer vsx-d514 if that helps. Please help me answer this I feel the answer might be simple but I just can't figure it out. Thank you for your responses in advance