Do You Need To Turn On a Subsonic Filter For a Sealed Box?

A subsonic filter is mainly designed for ported and other vented subwoofer enclosures, but you can also you the subsonic feature on a audio amplifier, for a subwoofer placed in a sealed type of enclosure. Turning on a subsonic filter for a subwoofer is important, so it doesn't get damaged and stressed out, on frequencies it can't even play. Turning on the subsonic filter on a audio amplifier, can make a sealed subwoofer sound more louder because it filter out inaudible frequencies, which are usually below 20 Hz, depending on what you set the subsonic filter to, therefore you amplifier puts out more for your subwoofer, for the sound frequencies you can actually hear.