Replacing my tweeters a good idea?

You are obviously not happy with the speakers as they are now, so what have you got to lose by experimenting! Try and get as much information on the specifications of the existing tweeter (there must be some somewhere on the web) and then see if you can match as closely as possible to this with a fabric dome tweeter for starters - as Trelja suggests try SEAS, etc. The specification you will need to look at closely is the impedence, resonant frequency, crossover frequency, etc. Have fun! Richard, vantageaudio.com

Wire a resistor to the tweeter leg? I am new to modifying components - could you be more specific? The tweeter is an infintity EMIT-R type. Thanks for the help!

Just splice the resistor into one of the leads to the tweeter; positive or negative won't matter. You could use an 8 ohm pot temporarily to get the exact value you like, then buy a fixed resistor of that value. If you still can't get it right I'll sell you my nice pair of 19mm Seas plastic-dome tweeters cheap. (I'm through with speaker building!) Good Luck.

Subaruguru:why are you giving up speaker building?

Yo Shabbadoo, I doubt that you can find a replacement for the EMIT tweeter that will sound half as good. They really are superior to most of the dome tweeters out there. That EMIT tweeter is just complaining about the cheap capacitor Infinity used in the crossover. Try bypassing the last cap (closest to the tweeter) in the crossover with a Crescendo cap of a .1 mf value ($7.45 ea.). Solder it in parallel with the existing cap. Or if you feel flush replace it with the same value in a cascade bypass arrangement. Read all about it at: http://www.northcreekmusic.com/Bypassing.html. By all means discuss the idea with George at North Creek before you try inserting resistors in series with the EMITs. The other thing that will help is if you treat the room with acoustic foam treatments to minimize early reflections off of the side walls, front and back walls and ESPECIALLY THE UPPER CORNERS.