subsonic filter?

[JMPisGOD 10+ year member]

I went to the kicker site to get the specs on a vented box that i am going to build and it says that it has the normal 750 watt rms handling in this enclosure but only with a 25hz subsonic filter set at 24 db/octave... without the filter it only handles 400 watts... What does this mean? Do the rockford bd 500.1 amp and JBL bp 600.1 have a subsonic filter that would meet this requirement? Or would you all just say screw it and go with the sealed enclosure for the solo... i want really low base but closer towards the punchy side, so i thought the smalled ported box would be nice.

thanks for the help

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[EPanther99 10+ year member]

a subsonic filter filters out the ultra low freq that can be damaging to your speakers. the freq are also below your hearing. the directory i have doesnt list wheather or not the amp has one built in so i would say check the website or email the company most of them will reply within a couple hours