- Jul 28, 2009
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I've never had any issues with hiss and I tend to notice such things. This includes through high quality headphones as well as the QSC K10.2 which is my amp and it has a tweeter and is very susceptible to hiss being a PA speaker. I would suggest contacting the dealer for support. As I recall someone in the past had mentioned the same issue with one here on TB though I can't remember if they returned it or if Yamaha repaired it.