MY PROBLEM
I'm mixing or mastering a song until it sounds pretty good on the Dynaudio
BM6a's and Sennheiser HD 600's in the studio, but when I hear the mix on
multimedia speakers or televisions the song all of a sudden turns out to
have a boomy low even the most bassy commercial releases don't. No amount of
equalisation, compression or spectrum analysis have helped me get a good
grip on how to deal with this. Let's say I'm working on a rap song. I put a
spectrum analyzer on the master strip or at the end of my mastering chain,
do peak and average measurements of, say Eminem which sounds OK pretty much
anywhere, then I try to compare that with my own song. Even if my song is in
the same key as the reference song, "copying" the peak and avg frequency
response of my ref can still leave me with the same problems in the low end!

MY EXAMPLE
http://boomjinx.com/music/example.mp3
Although this particular mixdown is not the worst examples I've had on this
song, I'm still not happy how the bass sounds.

MY FINDINGS
It seems to me like the unpleasant boomy area can be found somewhere between
120 and 180Hz, while things can get quite muddy if too much is going on
around 250Hz. Dropping 3-6dB at 135Hz and 3-6dB at 250Hz on the entire mix
pretty much always solve these problems for me, but that takes out too much
from the low end and lower mids. After applying this less than ideal
"quickfix" to my mix, the analyzer also shows a big drop at 120-140Hz and
250Hz when comparing to my reference songs. Considering I usually roll-off
below 115-150Hz on everything but kicks and basses, those are the only two
ingredients that seem to cause these problems in my mixes.

HELP
I am very interested in hearing your experiences dealing with or avoiding
this in the mixing and mastering process.

-BJ