[danpeddle]

Multi band compressors also help in this domain, choosing which frequency band to attenuate or boost. For multi channel audio, phase becomes important too. Not for nothing is a typical trick in mastering to restrict low frequencies to mono..

[SuddsMcDuff]

I always thought the primary reason for that was that stereo low frequencies, when recorded onto vinyl records, hugely increase the risk of the needle 'jumping' out of the groove and skipping into another one.