Yah, the key is to have a filter envelope with a slow attack, to get that "wow" sound.

For the O Phase bass: I'm not hearing a bass sound, separate from the super boomy kick/tom sound. It definitely does have a big tom feel to it, and there's clearly lots of reverb on the low end. First thought: in SubBoomBass, you can synthesize bass tones with a percussive top layer and a sub undern...