I'm not sure that this is the best thread to bring this up. Lately I've been noticing that mp3s I buy and download from Amazon sound like they have too much treble. I've been noticing this both on my mp3 players and in my cars built in mp3 player. If I run the EQs flat, there seems to be too much in the highs. I'm looking at my M3K, and after doing some testing around, I decided that I needed to boost the bass a little and turn down the 4K. But the sounds that are bothering me seem to be in between the 1K and 4K. I don't understand what is happening because it was back in early 2000s when I got into mp3s. Back then 128 CBR sounded really good to me. I experimented by creating mp3s with even lower bit rates. What I could hear back then is that the highs became slurred, and gradually disappeared, leaving me with a more bass sounding files. Of course I had no plans to listen to music this way, I just wanted to understand what happened as I lowered quality. But these days the opposite is happening to me. Since I have a huge collection of 128s I was going to convert all the Amazon downloads into that. But I noticed that the highs were bothering me, so I quit doing this, and just started running them as is. Which should be the better quality as far as mp3s are concerned. For a while this seemed to solve my situation. But recently I bought several albums from Amazon mp3 and the highs started bothering me again. Maybe I need to get my hearing checked out. I want you to understand something right up front. 90 percent of all the music I listen too is copyrighted. Therefor I can not share anything I own for you to listen too. However, I can compromise by giving you some youtube samples that someone else already uploaded, and tell you that it is very close to what I'm experiencing with the Amazon downloads of the same mp3 album. If you think this is too bright or too high too, then chances are it isn't just my hearing.