i started a project building two boxes each is :
11cu.ft. w/ two td12x in push pull ( one facing in, one out ) tuned to 30hz (ported) .
initially planned on using this up to around 400hz but now my plans changed and my mains actually cover the range down to 80hz .
so ideally i need a true subwoofer to cover below 80hz.
here are some questions:
can i just tune my 11 ft3 box lower (extending vent length) with the two td12x to 20 or 25 hz ?
fs for the td12x is 34hz , so i was wondering if tuning the box below Fs is not advisable ?
which driver/s would be best suited for my 11cuft box to get extension from 20/25 to 80hz ? tuning / hi pass ?