I finally got my boat back from having stereo upgrades etc done and had a listen while boat was in shop. While finally sitting and listening to the stereo while dewinterizing,i noticed a slight cutting in/out of one of my Polk speakers.I was listening to the radio so thought at first it was the station but soon enough this one speaker was only workin half capacity...Pulled the speaker out and low and behold there is a little capaciter kinda thing just kinda dangling. Now after fiddling around a bit i notice one of the solder connections has broken. So what i'm wondering is to fix this i want to resolder ,But do i need special solder to fix this,hopefully i can just heat up the little dab on the speaker and just heat and solder but if i need more what kind do i need.?

I really hope i can fix this as it seems so simple and Polks are really hard to find and i hate to have to buy a pair just for this?