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the tweeters are easily replaced but the woofers use a strange impedence. If you have replaced the deck you can put what ever speakers you want to with a little re-wiring.
I don't know much about audio components, but I'm going to assume that the tweeters are the small ones mounted up by the windows on the doors. Either way, the drivers side one by the window is the one that definetly is broke. You said they are easy to replace, but where can I get another Mach 460 one? I just don't want to dump much money into something that only barely annoys me right now, and I would like to keep the stock look.
I am afraid to know what you might pay for the mach tweeters but you can get a small tweeter(smaller then 2.5"s) and you might have to make a mount for it but some basic tweeters should not be more then $20.