i want to replace my front speakers and tweeters with new alpine 61/2 door speakers and tweeters i need to cut the back of the cups out to fit the front door speakers. i need suggestions for the best tool to do so. also how do the factory tweeters which are located by the windows come out?

 

I'm assuming that you remove the interior door panel to remove those tweeters.

As for cutting the cups, if it was me I'd use my drill (seriously) as I don't have access to a rotozip, dremel, etc. It works, I once used that method to modify an airbox. Just used cable cutters to clean up the edges.
Just be sure that with the new speakers sticking farther into the door, that there won't be any clearance issues with the window when it's down.

 

I dont know if you are aware that the door panel is really a plastic...you can cut out the surrounding back area of the front speaker section by just taking a knife!!

I know that you anywant wants to do a great and neat job...but you dont need any special tool to make a nice round hole...just follow the perimenter as a guide!!

 

On my car the "cups" are very hard plastic, a separate piece from the panel. I've never taken a look at the ones on that year, guess it's different.

 

on my 97 coupe...which applies to all 96-00 civics...the inside of the "cup" as he states it is a softer plastic than the door panel plastic itself!!

easy to cut around...you can always get a dremmel...and do a tidy job!!