peak at 3khz

sprawl85, how did you find the objectionable frequency and the db peak?  Just interested to know... 

Is this a manufactured crossover / component set, or is it your design?  And can the tweeter be crossed over higher so that it's output doesn't add so much to that 3000 Hz freq range?  I'm thinking that it could be too much combination mid + tweeter that hits together in that range...whereas I see that DYohn is looking at removing that range, for the most part, from the mid driver's duties.

Crossover point, like DYohn asked for, is important...or other info regarding the crossover / driver design.

Ok, you bring up an interesting point.  I have a polk dx3065 component set minus the tweeters and they are swapped out with some unknown jbl tweeters.  http://www.polkaudio.com/downloads/manuals/car/dXCompSystemsManual.pdf

that is a link to the component systems.  I currently have the crossovers set to the "A" setting and it seemed to help a little but not much.  I am kinda just basing the frequency on what my ears are hearing.  I have tried all three tweeter level settings to no avail.

The JBL tweeters have their own crossover built into them.  It looks like just a capacitor, so 6db/octave I beleive.  I haven't looked at the inside of them in a while though, so I am not positive on that.  Could the crossover on the tweeters be messing up how the db3065 crossovers are acting? 

With the mids completely disconnected from the crossovers I still notice this extremely louder sound which sounds to me like the 3000hz area, just judging by some sweep tones.  But it is somewhat lessened with the crossover hooked up, but it is still unbearable.  damn, I can't even stand listening to these most of the time.  I wish I could just afford another component set, but I am so broke I had to move back in with the rents, so that really isn't an option right now.  I am just looking for a cheap fix.  Making my own crossovers might be an option.  I wish I could see a frequency response and impedance chart and bl curve and all that happy horsedoodie on these midbass's and actually get some info on the tweets and figure out what to do from that point on.  I don't have the gear for that though.  I know they have a very large amount of xmax and midbass, and loads of power handling and they seem really detailed and I just don't want to get rid of them.  Maybe it is cone breakup I am hearing.  I have never really heard what cone breakup sounds like, but I know this sounds horrible and thin and shrill at that frequency.

What to do, what to do....

OK.  First of all, what you are hearing is likely a combination of several things, but the bottom line is this: it is a crap shoot to try and mix and match speakers with pre-built crossovers unless you have the proper test gear to determine the speakers' exact performance characteristics; and even then it is extremely difficult to end up with something that sounds right.  Your story is typical.  If it had worked correctly it would have been pure luck.  And no, you do not want to run two different passive crossovers in series.

Without the technical details of both speakers and of the crossovers involved I cannot really suggest anything further except to say disconnect the tweeter, or live with it and hope you don't blow your amplifier from low impedance swings.