Speakers not working

[orioles26]

I put some boston acoustics speakers in the back of my car and they sounded great and worked for a while. Now both right side speakers don't work but the tweeter on the right side still works. I don't think it is from how i installed them becuase i did not touch the front speakers but one doesn't work. All the speakers are running of the head unit. Does anyone know what could cause this problem?

[Raven]

No idea as to the cause of the problem, but a 9 volt battery can tell you if it's the speakers or the HU.

[orioles26]

How do use the 9v battery?

[Raven]

Attach it to the speaker wires positive and negative, If the speaker works, you'll get a fairly soft popping sound. This won't damage the speakers. Might do something to improperly crossed over tweeters, be on your guard.

Pop = working speakers, no pop = dead speakers (or dead battery)