Not pertinent to the OP's issue, but in electronic music the computerized synths are sometimes played with tones going down below 20Hz. You can't hear it, but with the right sub you can sure feel it!
And, IMHO, it would be a sin to play Nine Inch Nails w/o a sub that goes down to at least 25Hz.
And, IMHO, it would be a sin to play Nine Inch Nails w/o a sub that goes down to at least 25Hz.