I'm pretty sure, it's just the highs of the sounds that are shit, if I put something bass-ier on, it's fine. I'll probably replace the main speakers too, but thought this would be a good place to start.You sure it's tweeters that you need and not the door speaker itself? Tweeters, if you have them, barley contribute anything to the sound so even if they're blown you would still have sounds out of the main speaker. If it is the mains speaker, just search for mx5 mk2 door speaker, and you'll get plenty of results from online suppliers.