I purchased my Sceptre S6's February 17, 2017. I just received them via UPS on 03/07/2017. After powering them up for the first time, they both made a slight popping sound. I turned the speakers on while the computer was on, and the sound occurred. I also turned the speakers on while the computer was off, and still, the same sound occurred. Today (03/08), it still pops in the same fashion. Is this usual or is it possible I have lemons?