(I'm not sure whether this question fits this site, but I'm really curious about this issue)
I had a pair of old Genius speakers that I had connected my headphones to and used their volume control for well... controlling the volume. It worked but had a lot of noise, so I decided to replace them.
I bought these Edifier USB powered speakers and everything works fine except one major thing: With headphone plugged in, I can't control the volume any more! It seems that when headphones are plugged in to the speaker's output jack, the volume control gets out of the circuit and it just passes the sound directly from PC.
Mind you, I can still control the volume using keyboard media keys or Windows itself. But not from speakers.
My question is: Is it considered normal behavior of these kinds of speakers? Or mine are malfunctioning?