I recently installed some new inwall speakers on a couple exterior walls (existing construction). While doing so I cut through the vapor barrier while cutting my whole in the sheetrock. I then connected my speakers put them in the wall and went on my merry way. As I sit here going through some HT builds I realize that I may have made a booboo. Do I need to go back in and seal those cuts in the vapor barrier or will it be fine as is?

I built boxes for my in walls and wrapped the backs in vapor barrier and put them back in. You may get water; you may not; but water usually isn't good for speakers in any amount.

Yes, you should fix it. Use a product called "Tuck Tape" for plastic vapor barriers.

Doh! The thing I never understood about insulation is, if there is water/moisture present isn't that bad for the insulation? I guess it won't be that big of a deal to go back and tape the cuts or something.

Doh! The thing I never understood about insulation is, if there is water/moisture present isn't that bad for the insulation? I guess it won't be that big of a deal to go back and tape the cuts or something.

Yes it is bad for the insulation. The point of a vapor barrier is not to keep out rain or other water from the outside getting in. That is what your exterior sheathing is for, whether it is OSB covered with Tyvek and Vinyl, or brick, or stucco, etc. The vapor barrier is designed to help keep the difference in temperatures from the exterior and interior from condensating on your insulation and walls, creating moisture and mold.