I also have this. However, I have even more noise coming out of the supersats from my other external amplifier, which is more noticeable. I want to always make sure I keep the room as quiet as possible, and most of the noise that's generated in my room is the external amp and the TV itself (old plasma). Otherwise, the Trition Twos are so quiet, I can only hear the hiss when I put my ear right up against it, so it's very quiet indeed and not an issue.

Nick, Happy New Year! I just wanted to follow up on this because I originally wrote that I haven't noticed a hiss. I was able to notice a sound I would more accurately describe as "wind being gently blown through an opening larger than that which would be needed to handle to volume (amount) of air passing through it". This is completely normal. I do have experience with powered woofers. Also, I almost need a stethoscope because it is that low in volume (decibels). Again, I am very confident at the volume (low decibels) we are speaking of, what you are hearing is completely normal when the speakers are powered on (and the internal amp is on).