Eddie, unless you mix exclusively with headphones, your room absolutely matters, where the speakers are located in each room, etc. all matters ALOT. Remember when you posted pix of your room and I was warning you about how close your monitor speakers were to the angled roof? You'll get all kinds of comb filtering off of that roof at your mix location.

The mix really can't sound consistent over different playback systems in different 'rooms'. What it can do is sound acceptable, but it will never sound 'the same'.

Even with treated rooms for mixing, that can't account for when you take your mix into a room with a corner loaded sub that is set a little high, that it's not going to sound different than playing it in your car, or over cans, etc.

Also, the passing of time reveals mix issues you simply can't hear when you are in the throes of a project. I listened to one of my songs I did about 5 or 6 years ago the other day and I was appalled by the 'room' sound in the reverb, a sort of unnecessary booming in the 250-500 Hz range. I would totally mix that thing differently now.

Here's a different test, where you say a song is bottom heavy - how about a reference recording being played back on that same system - is it bottom heavy also? When you know you are done is when you can take those reference recordings, and duplicate the playback anomalies in your own songs that are due to the system/room that are revealed in the reference recording playback played over the same systems.

This is why reference recordings are important to have on hand. Pick some recordings that you think have the vibe that you are shooting for and buy the CD. Take notes of how that sounds played back on the kinds of systems on which you want your recording played.

Make notes (recording X is a little bass-heavy on the 5.1 system - it's o.k. if mine sounds similar, etc.)

-Scott