is this possible???

Might as well just replace the front speakers

I think the signal going to the tweets is full range from the Bose amp (assuming you've got the Bose system). That means there needs to be a cap (or some sort of bass blocker) on the tweeter to only pass the high freqs. Some aftermarket tweeters will have them built in (especially some of these cheap add-on tweeter kits), so you may be ok. If it is a high-end set from a component set, you'd probably have to add something.

I have replaced the front door speakers, but just thought it would give me a little more benifit to replace the tweets also

You replaced the front speakers and are still running the stock tweeters?

Why in the world would you need that much treble?

You should have got components and the tweeters would have replaced the stock speaker and tweeter.

[quote author=robs08mazda3 link=topic=137335.msg2961409#msg2961409 date=1235601573]
You replaced the front speakers and are still running the stock tweeters?

Why in the world would you need that much treble?

You should have got components and the tweeters would have replaced the stock speaker and tweeter.
[/quote]

I could make the argument that the stock tweeters put out little enough treble that it wouldn't actually make much of a difference if one left them in......

ok I understand that components would have been a wiser choice, but I would still like to know if the tweeter could be swapped out without adding a crossover??? Thanks

You'll want a high pass filter / bass blocker to avoid blowing them with too much low-end power, and the best way to accomplish that is with a crossover. The stock tweeters have bass blockers on them

Well said Alec

A Pair of coax speakers that have built in tweeters plus a second tweeters usually ends up being way too much treble, along with a lot of high end cancellation. This is one big reason why components are a much better way to go.

However, if you decide the only way for you to go is to get aftermarket tweeters and add them on, most tweeter sets will come packaged with some type of high-pass filter to use. Do make sure before you hook them up though. If you hook a tweeter straight to a full range signal, it's life will be spectacularly short.