Dude -- the Holy Grail is right behind you!
This is a video demonstration of the octobasse, a massive stringed instrument capable of producing frequencies lower than the human ear can detect. It's the kind of instrument you feel more than you hear. I remember the first time I felt my nuts rumble at a concert. That's when I knew I had to be a groupie, no matter the cost. The cost was a lot of handjobs, FYI.
Keep going for two videos, the first of a guy talking about and playing the instrument, the second of several people trying to play the Jaws theme on the thing, most which is almost entirely inaudible.
Thanks to STEPH, who informed me she plays the violin. I always wanted to play the flute.