AVS Special Member
Join Date: Oct 2002
Location: Centreville, VA
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Replace both. Even if you were to find the excact speaker and replace the one, they might sound different due to age.
The RMS ratings aren't going to make any difference here. Look for drivers that have the same or less than frequency response as the old ones....for example....if your current speaker driver is rated at 48Hz - 20Khz.....go with a speaker that is 48Hz or less to cover the lower end of the spectrum.
Call Parts Express and ask for a technical person to discuss what you want to do. They are knowledgeable and should be able to provide you the best alternative.