Where to set my subsonic filter?

[Brian235]

Hey guys I was wondering where I should set my subsonic if my amp has a 24 dB/oct, variable subsonic filter and my box is i'm guessing tuned around 40 hz because the loudest frequency I've found is 38 hz ( I have the pre-loaded dual Rockford Fosgate p3d4 enclosure I couldn't be bothered to make my own box and their site doesn't say what the box is tuned to.

Any advise would help also I find that when I get to around 33-34 hz my subs seem to drop off pretty hard I'm not sure whether or not its my factory HU or if its the tuning I have a LCQ-1 factory integration and don't use the accubass technology that it has. I was wondering if anyone had insight into this (with the new amp maybe i'll get more of a response? the amp i'm using now isnt feeding much power I doubt this cheap pioneer amp is actually putting out 800 watts).

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[n2audio 5,000+ posts]

Would be MUCH more accurate to get Fb with interior dimensions and port dimensions. It would only take a few seconds to plug that info into a modeling program and get a precise answer.

W/o knowing anything more specific - I guess 35 for now.