That must be an ancient sub. The new subs don't have a setting like that.

I don't know but if I had to guess, the audio setting engages a rumble (subsonic) filter. This filter stops low frequency noise that is transmitted via a record player from playing through the sub. This type of noise arises from vibrations due to trucks, bombs, zombies stomping around, etc.

The movie setting by-passes the filter because movies have those low frequency effects built in.

Last edited by Mojo; 09/19/20 08:07 PM.
House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated