Introduction:..
^^^^^*edit: Vodka disclaimer.
It is really possible that you are using a very wrong eq during the mixdown on the concept to get into a compressor and limiter for your master.
I'm sure you are aware about the fact that any tune should be cleaned up below 30hz, cus that range of freqs can only create unwanted lower noise, wich is not so bad for you, but the mastering compressor and other processors can be heavilly affected from the extra heavy job that those freqs are giving to them and therefore your overall mix can get shitted up.
Sub it's fucking annoying when coming to mixdown and mastering... It is actually the major problem...
Finding the right balance between sub and rest of tune it's a delicated compromise that the producer must understand. Most of time, we (producers) want to push that 50hz into the bones of a fucking whale, but it is not so important how loud those 50hz are. It is more important how many subtle harmonic resonants has... Because the 50hz they will come up like bombs anyway in a rig's PA. But the shuffles of a good modulated bassline will also work on a wider range of freqs than a 50hz, taking no limits of choice on the whole range of the 20 to 20000hz.
Now I feel I can talk about this because finally, after many years I was after the same problem you described, I did understand where my problem of lose of dynamics was when the sub was dropping in..
- the levels
- the compression ratio
- the eq before comp rather than after comp
- the wrong mixdown on each single channel, including subgroups of drums and all the rest.
Also, it is extremely important (to don't say vital) to have a pragmatic view of the dynamics before mastering chain and most important: THE HEADROOM!!!
Load of new age producers they use to mix everything up to the 6db ceiling in almost every channel... red everywhere... and then, they put a gain reduction before the master channel compressor to avoid clips and gain headroom... wtf is that??? The headroom should be into the mix, into the origins.. every channel should marry the other, it should be an harmony of dynamics and levels and freqs... not all spreaded all around and then cutted just before the master! Cluttering of disgusting Skrillex style sidechains.. Horrible, an offence to a mix master.
When all your channels are well balance in levels and freqs, givinga a good 15db's of RMS dynamic range, when you feel that all it sounds glued already, that's the moment when you can start to bounce your mixdown and give the last fine tuning and boost... and the limit of your master compressor it is when you feel that compressing too much you tune force your bass to take away too much dynamics from other parts ... Think phisically, think how a low freq waveform it is in physical world.
That's how it work in reality.
That's also the reason why it is forced to be mono in vinyls...
A lol:
http://www.vinylrecorder.com/bass.html