I have a L1 Compact,and the mic input has a hissing or cracking sound, I have tried a Guitar through that side to no avail. It is not usable the way it is . Thanks , Ron
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Please check out this article.
Do you hear the hiss when you have a microphone connected to channel one?
It sounds like you need to call Bose Support. They'll be available in the morning.
Bose® Product & Technical Support at (877) 335-2673
(U.S. and Canada only)
Monday-Friday: 9:00 AM - 9:00 PM ET