Tuning help

[Prodetail]

Hey.

Just need some help on the subsonic filter business and lpf.  As its giving me a headache. 

I have a Rockford Fosgate P3D2 in their own ported box tuned at 40hz. Its a 600rms sub. 

Im running it off a 650rms amp. 

On the amp my options are gain, bass boost, subsonic and lpf. 

Subsonic filter runs: 15-35hz

Lpf: 30-250hz

Now the bits i need help with are the subsonic filter and lpf. 

Any reccomendations what to set these too? 

Thanks

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[THATpurpleKUSH 5,000+ posts]

For a box tuned that high, set the subsonic for about 30hz, turn the lp all the way up to 250hz and set the headunit hpf to 60-80hz depending on how good your mids are.