Building a Subsonic Filter

[Grimace0202]

I have a couple of Old RF Punch Amps. I am using a Punch 200 to run my subs. These old amps have the removable crossover cards in them. I am planning on modifying the crossover card to create a subsonic filter, and I don't know if I should set the new Crossover point at 25Hz or 30Hz. Currently I have a ported box tuned to 34Hz. Would setting up my crossover card with a 25Hz crossover point be to low and allow damage to my subwoofers? Would 30 be more ideal?

I am able to use my Headunit to control my normal LPF and HPF but if I adjust the crossover frequency on the card in my amp I should be able to essentially create a Subsonic filter.

Anythoughts or comments would be appreciated. Thanks.

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[profundus-sanus 10+ year member]

as a rule of thumb set your subsonic 1/2 an octave below tuning... so 25hz sounds good.