genearally its by getting your first tuning say in the rear chamber, i did mine at 32hz, one octave above that is 64, but i was worried about a peaky responce and tuned that to 55hz. Also i used a 3" aero for my rear which was like 14 long and shared between chambers. And i used about 3/4 of the cone area of the subwoofer i used as my front chambers port volume. Im still learning but i did that and got a super flat responce with a awesome frew range from high 20s to around 55-60 area.
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