I'm not sure they all go below 25Hz. It would be nice if this little tidbit was listed on the plastic case of the disc where they list the audio format.
Oh they go down to at least 25Hz, in that short list from post #4. ...They were visualized on a Multichannel Sound Pressure Level Meter display by pro movie reviewers (a bunch from WidescreenReview).
{They use a Dorrough pro audio 7.1 multichannel level meter and real-time full frequency display analyzer.}
If they would indicate all pertinent information for movie buffs and bass freaks and sound/music lovers on the liner notes or back cover, they would have no room left for original screen aspect ratio, various hi-res audio soundtracks, languages, etc.
* Did you also notice that for some of them (quite a few actually) you need some magnifying glasses to read the minuscule lettering. ...I hate that! ...Talkin' 'bout Blu-ray here.
I think that in addition to your two existing subs, that new IB project of yours with four 15inchers is going to rock your palace!
Let me make a new list of movies on Blu-ray especially for you.
...Just give me some time...
Meanwhile everyone else is also free to contribute.