Epic160 dosnt play deep enough

[Streetbass Tony uk]

Hi guys. My epic160 when activated and bass frequency set to its deepest bass only restores bass down to about 30 or 35hz, is there any mods or pots inside that can make the deeper, 20 or 25hz would be nice. Bass plays great playing rebased music down to 20hz with the epic turned off

I'm new here, my sub is a single sundown x18v2 in a 8cuft box tuned to 27hz, it's run by a taramps md8k