hey all i am getting a set of eclipse tweeters soon.. nothing special at all but better than nothing for the time being.

im just wondering how to wire them up...
can i just put them in with my fronts into the head unit?
as both my front and rear speakers are running of the headunit with my subs running of the lonesome amp i have atm.

Depending on the impedance and ohmage of the Tweeters and what woofers you have in the doors will determine how they should be wired up..
If they have thier own Cross over then there is no reason why you cannot wie them up to your Fronts

As above

You should really look at sourcing some prebuilt crossovers for them. Then just run the relavent h/u speaker output to the crossover unit, then same deal with the woofer and tweeter.

see exhibit 1 - left wire is hu or amp input, middle wire is woofer output, right wire is tweeter output
http://img185.imageshack.us/img185/7666/xover3jl.jpg

Yep, some tweeters have internal crossovers, try running these off the speaker terminals first. It is likely that the tweets crossovers dont have the build quality to handle the power (off the headunit it should be fine.)

If they distort you will need to find a way of filtering out the bass frequrencies. via a pre made crossover, or alternatively you can buy capacitors and wire these inline with the tweeter to get a basic 6db/octave crossover.

Peace

Tim