At the top: . I was set to “Stereo.” Fine. But then I saw it. A tiny, almost apologetic checkbox: “Separate all input jacks as independent input devices.”
I loaded a test tone. A 1 kHz sine wave. I pressed play. realtek audio control panel
I tried to play a song. “Everlong” by the Foo Fighters. The file loaded. The progress bar moved. But no sound came out. Not crackling. Not static. Just nothing. The speakers were on. The volume was up. The drivers were working. But the Realtek Audio Control Panel had done exactly what I asked: it had applied a room of zero reflections to everything. No sound could escape because no sound could exist . It was being cancelled out before it even began—a perfect inverse phase match across every frequency, from 20 Hz to 20 kHz. At the top:
