Hi, I've owned for about three years a 2.1 speaker setup that I connect to the PC with a dedicated soundcard. Usually I listen to pop music or electronic music, but recently I started listening to Mozart's Requiem in D Minor. The sound on classical recordings is less dynamically compressed than on pop recordings, so I turn the volume up to make up for it. And I can't help but notice a slight crackling, a sizzle, in the left speaker. It's not very loud, but it's definitely there and is distracting me from the music. I played the video https://www.youtube.com/watch?v=nklzAUrXSuM to test various frequencies. I start hearing the noise at around 200 Hz and when I set the volume to anything higher than 30% of max volume. I guess with modern recordings, the noise is low enough compared to the level of the music that I can't notice it, but on classical recordings it's very noticeable. My question is : is it a problem with my speaker, or a problem with cable connecting? How can I tell if the problem comes from the speaker or if it is something else? Thanks for any advice!