HELP subsonic filter in need

[eclipticvisions 10+ year member]

my infinity a1211 1300 rms at two ohms has a bass eq and no subsonic filter ,im aware of. It says in the manual that the bass eq acts like the subsonic filter but there is not a button or anything. so is there something i can buy to be my subsonic filter.

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[supa_c 5,000+ posts]

http://store.hlabs.com/pk4/store.pl?view_product=13

These will work