I work in a small, bright & untreated room and my Yamaha HS50M's only go down to 55hz so I monitor subs on headphones (Beyerdynamics 990 Pro, like you have) and A/B with well-produced tracks that I know work well in larger commercial environments.
If you work in a small, untreated room and use a sub / woofer, I imagine the low-end monitoring experience could become pretty deceptive...
Depending on the room size, would the bass waveforms even have enough space to complete a full iteration to yield an accurate listening / monitoring experience?
If my understanding is correct, that's why bass is called "low frequency": each cycle / iteration of the wave form is longer, thus iterations / cycles / repetitions of the waveform are "less frequent" over time / space than shorter waveforms. Conversely, higher frequency sounds have shorter wave forms and thus can accomplish more iterations / cycles / repetitions within the same amount of time / space.
As such, in relatively small spaces, I imagine space constraints conspire to make it easier to accurately monitor high end than low end.
So that's why I use Headphones to monitor bass rather than a woofer / sub. For additional sanity checks, I also do A/B test comparisons in my car stereo which has excellent bass response.
BTW - If my understanding of the meaning of low freq vs high freq is incorrect, then somebody please set me straight
PS: Many respected producers have made fantastic, well-produced music without woofers / sub monitors (i.e. Breakage, Actress, Burial, etc.) so I suppose it's just a matter of knowing how your tune is SUPPOSED to sound on YOUR rig to get the results you want (militant A/B comparison with the right reference material).
That's my amateur input for ya
