I guess I'm the odd man out here. I feel that my mixes "work" at least for me by never using phones or a sub. I find that if I mix the bass where it sound good on my KRKs then it is equally good in my vehicle and on our living room system which consists of Polks and a Yamaha sub. One caveat, I do tend to use compression and EQ on most bass tracks to enable them to sit better in the mix.

Bud