Port Box confusion

[PlymouthScamp71 10+ year member]

last time I was on I was told to turn my subs around and face then backwards, did this and they sound better now I'm looking at getting a vented box tuned to 40 hz. I have a 1000 watt R/T power amp but idk if it has a subsonic filter or even if I need one! someone please help.

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[BrownVanMan 10+ year member]

More info is needed on exact amp sub car what you want etc. then we can help. Also tuning to 40hz is pretty high, unless trying to get higher numbers for comps.