forget eq. i dunno if you mean filter with eq, but if you mean graphic eq or something like that, forget it. just use a LP filter, and try as many as you can, alot of them sound very different. the more poles a filter has usually the better it filters and sounds. If you do what i said and run your signal through a LP filter set to 250 hz, there is no way in hell your tweeter is going to make sounds (unless its rattling in your speaker box from the boomy bass vibrations
) . maybe its vibrating because you turned the q on, and its beefing up the low bass frequencies too much. You can try using a HP filter in this chain as well, have the LP filter run through it. set this to 40 hz or so. this will often enough clear up some headroom and give a cleaner bass. i recommend starting at 250 hz in the LP filter, and then going down from there, this is already midbass frequency, all the low shit you are interested in lies between around very roughly 50 to 120 or so.