Hi, I recently bought a MacBook Air and ever since I've had it I seem to have this popping/crackling sound. This sound happens when I'm using the built-in speakers, external speakers connected via the analog jack, external speakers connected via thunderbolt/HDMI adapter. I believe it is not a hardware issue as I took it in to Apple and they replaced the speakers for me but the problem still persists. I'm posting on here is because I believe it is a software type of issue but can't seem to solve it. When I was using a Windows computer in the past I had the same problem when I connected a USB headset to the computer. The problem back then was that my "DPC latency" was too high, so I had to take some hardware components out and that reduced my DPC latency. To my knowledge so far DPC latency only applies to Windows not OS X, but I thought I might ask here to see if anyone is having the same troubles. I also found on a website where a guy was saying the popping/crackling sound is caused by the laptops sound system. Apple implemented a system that automatically turns off the sound system after 20 seconds of inactivity. His way to resolve it was to install "Antipop" however the link he provided led me to download these Antipop DMG that doesn't install. They are now stuck in my drives, as I cannot eject them. So I am lost now and this popping/crackling sound is a bit annoying. The issue persists even when listening/watching files from my laptop to listening/watching media on the internet (YouTube). Please help? PS: I am also new to OS X, so I'm learning and would appreciate any constructive comments made.