You should replace both speakers since you won't be able to get an identical replacement.
If there are no markings on the speaker you can measure the impedance of the good one. http://www.wikihow.com/Measure-Speaker-Impedance
and get 2 that fit the openings and have the same impedance.
Parts Express and Madisound are two sources for good speakers.
It's also possible to rebuild the bad speaker although the price might not make sense in this case. Check
Millersound for that option.
That blown speaker must have impedance (Ohm), power output (Watts), and dimensions. There are plenty of stores whereby you can filter on these parameters.
If you are changing a speaker stereo system, change both.
You should replace both speakers since you won't be able to get an identical replacement.
If there are no markings on the speaker you can measure the impedance of the good one. http://www.wikihow.com/Measure-Speaker-Impedance
and get 2 that fit the openings and have the same impedance.
Parts Express and Madisound are two sources for good speakers.
It's also possible to rebuild the bad speaker although the price might not make sense in this case. Check
Millersound for that option.