For Sub-bass we have a term and definition in Music Technology.

Bass frequencies which are below the point where sound is directional (@ 150Hertz) and above the point where it can no longer be heard (@20 Hertz). below this, it is known as "infra bass". It is the fact that sound is not directional below 150 Hz (you dont need a stereo pair to recreate its position in space) which enable the design of loudspeaker systems with solitary sub bass units which may be tucked away behind sofa's etc!
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