I don't like the way Dynamic EQ pumps up the bass, to the point of making it sound boomy/muddy, while watching movies.
I listen well below reference level at around -30dB to no louder than -26dB.
The sound seems to be much more open and natural, with Dynamic EQ switched off.
Bass is noticeably tighter, more musical and more transparent.
If your bass sounds boomy and muddy with DEQ on with movie content, there is a problem in the system. DEQ won't make bass (for movies) sound boomy or muddy. The chances are it's your room that is the problem and you have some bad ringing at the frequencies that are sounding boomy. DEQ will boost the SPLs of those frequencies and that would make any ringing sound worse. This is especially so at -30dB. If you can experiment with subwoofer placement, using a sub crawl if you have no measuring gear, you could probably improve things. Treatments would also help if you are able to accommodate them. But in a properly set up and calibrated system, there should be no boomy or muddy bass, with or without DEQ.