With all EQ settings flat and all of the DSP stuff turned off, try lowering the treble as far down as it goes, play music at a comfortable listening volume, then gradually increase the treble until it sounds right. To me the difference between -3 and -4 is significant, and if you're trying to "listen" it may not seem as dramatic but if you just "feel" the music and the distress on your ears you will notice that at a certain point the highs go from comfortable to uncomfortable, then back it down one. After that you can play with the mids and the bass, DSP, whatever.Thank you both for the suggestions. I went ahead and completed the 504 update myself, and I can tell that there is a subtle difference to the quality. I feel like no matter what I do with switching the settings around, the highs make my ears want to bleed. I will try both of your setups to see how it goes. I was hoping that the speaker upgrade would be enough to satisfy me, so I am still crossing fingers that after they break in and I get them dialed in just right - we will be good!