I bought 3 sets of speakers of different brands and all of them had the same issue. The left speaker always have weak or no output (it's always the left speaker!). I'm pretty sure it's coming from the amp and not the satellites. Now I'm beginning to think that this problem might be coming from my computer. No, the sound card is fine and the left and right volume control is even. Maybe some voltage problem is making one speaker side go bad? I am frustrated now because I have no reliable speakers to use for months. I'm sending my defective 2.1 speakers to the warranty service but I really want to make sure if it's a speaker problem and not the PC or sound card. Or maybe I'm just unlucky? Any help would be super appreciated.