that's a bit low for a ten. shoot for ~35Hz, and yes you want a subsonic filter for a ported box. Audiocontrol crossovers have tehm built in.. the EQL may be a good choice. retail is $189. street price should be under $150
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what are subsonic filters for and would it do me any good to get one for my brahma 12 in a sealled box
don't need one for a sealed box they block the sub from getting any frequencies below a certain point, like 16Hz. trying to play that low with a ported box can damage the sub due to loss of damping. the sub over-extends and you have a nice doorstop.