I like the 'boom' sound at the beginning of the trailer. how can I create it in ProTools?
I am not currently running protools, so I can't tell you the exact plugins to use... BUT, to roughly approximate this sound, find a kick similar to the one at the beginning of the sound. Add to this a long reverb around 80-90% wet followed by a delay set to 1/4 (at 120 bpm) with a feedback long enough for it to echo around 5-7 times or whatever sounds good to you. After this, you will most likely need to EQ out highs and mids (down to somewhere around 300-400Hz) fairly drastically with a subtractive high shelf, perhaps 10dB or so. Also low cut anything under around 50Hz to keep sub frequencies under control. This will never sound exactly like the clip since there are many variables, but it should get you in the ballpark. You can play around with reverb patches, EQ settings and different kicks to get something you like. Hope this helps!