Advice #1: Replace them with the same speaker that's in there.
Advice #2: If you don't do #1, get help with matching the speaker's performance characteristics to the size of the cabinet - you could replace them and end up with a cab that won't perform because the speakers are not well suited to the enclosure. In other words, read the FAQ and Bill's link above until you DO understand them!!
Advice #3: See #1
Repeat as needed. You really need to tailor any replacements to your specific enclosure - and you didn't provide brand, model or other info.
(Not trying to be mean about this, but some homework will benefit you personally and will help you in the future.)
"The best way to tell a lie is to tell the right amount of the truth, and then shut up." Robert A. Heinlein
Last edited by Pilgrim : 03-22-2011 at 11:12 AM.