What types of things would cause an occasional popping sound in my speakers? I have a Kenwood 6050 receiver, and an inexpensive set of RCA speakers from an older home theater in a box that I am using until I can afford better ones and a Sony 50 watt sub that I have turned up only about 1/4 of the way. I do have a couple of splices in my speaker wires, because they wouldn't reach my receiver, but I plan on rewiring soon. Could that be the cause? Thanks in advance.