Sherwood Preamp # S6020cp phono stage question

This Sherwood unit has a button that says " Ultra low base EQ "
I would like to know what this button is meant to do...what is its purpose ?
Is this button for loudness or phono?
When button is in off position....the speaker woofers move back and forth.
When button is in " in" position, speaker woofers do not move.
....however they do sound better.
Thank you

rocky131301-22-2021 7:35pm

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yogiboy Details Discussions Posts This discussion Message User 5,700 posts 01-22-2021 at 08:00pm Copy Comment URL Report Comment Edit Delete This is a quote that I found describing what it does! "A built-in Ultra Low Bass Equalizing Circuit provides a 6 db boost at 30 cycles, for subwoofer-like response on speakers that can take it. And at the same time, it rolls off the bass at 12 db per octave, effectively removing all subsonic interference."