Hey everybody...Well here is my situation followed by my question. I have been doing mixes lately for much more professional artists than the run of the mill local kid garage bands I used to get. I produce mainly rock projects. Usually I used to just do the poor man's mastering cause the kids couldnt afford to pop down any more cash for a true mastering engineer. Well it's nice to finally take the step up and record better artists but my problem is this...I got so used to using the poor man's mastering method across the master bus that now when I went to mix down just the mix (unmastered) and I play it in the car to examine the balances between elements it sounds so dull and lifeless. The balance is there. Yet nothing sounds polished. It sounds like someone kind of has a blanket over the speakers maybe. I raise the treble in my car and the bass level a bit and it starts to sound a bit better. So is this something that I should leave for mastering or try to fix in the mix within the individual elements of the song? For example: the guitars sound small for some reason. I boosted them a bit in the 100-240hz range with a small broad bump and it helped but I don't want to muddy them up to get that defined fullness. Are these type of things that I should fix in the mix or leave for mastering? I guess the mix as a whole just lacks that definition I'm used to hearing. I've been looking at some freq spectrums of some reference cds and my mix resembles the freq plots so it would seem I am on the right track. I really wish I could find a way to post the mp3 file or .wav file right now. Maybe tomorrow I can. I appreciate all the help and advice.