Ok, I just got my hands on a replacement tweeter (1011956) that works with this speaker. The three screws that held the old tweeter in place are too short to hold the new tweeter in place. However, I found some screws that I could use and the treble sounds much better now. My first thoughts are that the highs are louder/brighter and more clear than the R-25C. I’m still testing but, am happy so far. I took 2 of the loose foam pieces out since they block the ports but, it does sounds a little boomy/muddy when lots of bass is present. I might put them back in and test again even though they make the ports useless.