The OP does not understand what Philip is trying to say.
 
The question was not about how to make the mix sound better.
 
The question was how to make the mix sound acceptable when the listener chooses to listen via speakers that have large holes in the speaker cones (aka playback device that applies fancy EQ, compression, spatial surround, etc etc etc).
 
But glad that you enjoyed the discussion.  I too have found it helpful and have learnt new things.
 
Wei Liang
 
 

Hey OP - great thought provoking question!  IMHO - Jeff Evans provided some great practical advice. 
 
I just wanted to chime in that looking at other situations that are similar in nature may provide additional insight.  Example:  software that automatically adjusts the image quality of a digital photograph.  These are "one size fits all" solutions that attempt to normalize brightness, hue, contrast, etc.  Photographs that are well balanced are not as drastically manipulated as those that fall outside the idealized parameters ( as determined by the software). 

Jeff Evans 
Look into MP4 encoding as well. It is far superior to MP3 encoding.

Correct me if I'm wrong, but MP4 is a video codec, and MP3 is the audio track that would be in an MP4 file.
I'm always willing to learn.

MP4 contains both video and audio, and I think he was referring to the audio encoding within MP4 which I believe is supposed to be better than MP3.

MPEG-4 is a definition.
 
The common use of the extension .mp4 is for files conforming to MPEG-4 definition part 14 which describes ".mp4" as a container format which stores time based media content.
 
best regards,
mike

Also,
 Generally speaking, audio codecs specific to the MPEG-4 generation seem to sound better than the older MPEG-2 audio layer 3, a.k.a. .mp3 at very low bit rates but in listening tests seem to be more or less equal at higher bit rates.
 If you want to argue about what sounds better at 64kbs then .mp4 specific audio codecs seem to be better.
 If you want argue about which sounds better at 256kbs or 320kbs you'll figure out that it is hard to find any .mp4 specific candidates to make a comparison with and mp3s sound pretty darn good.
 
 The newer .mp4 audio codecs are primarily designed for bare minimum bit rates and are primarily a benefit to operations streaming large quantities of parallel transmissions through a data stream bottleneck like, for example, a mobile communications transmission tower.
 
 best regards,
mike