There is one high-pass filter that I forgot about - the loudspeakers.
I have a Velodyne 18" subwoofer with 1250-Watts RMS power. It only goes down to about 15-Hz +-3db.
Although my CD player may go down to 2-Hz, even a big subwoofer cannot get close to producing much useful output at anything close to those frequencies. Velodyne suggest useful output down to 8-Hz.
There are a couple of pipe-organs with 64' pipes which resonate at 8-Hz. One is down the road from me, in the Sydney Town Hall. As luck would have it, my partner has just bought a 3-set CD collection including two CDs made with this organ.