Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
You're right about bass under 30Hz, especially at moderate listening levels. Deep bass isn't so much heard as felt, and you really need the power levels to be high enough to vibrate your body for infrasonic bass to be noticed. Below 30Hz or so, it stops becoming sound you hear and becomes more of a tactile sensation. See the Fletcher-Munson curve: