posted
I'm thinking about building a ported enclosure for my JL 12w3v2's. Right now they are in a sealed box ( 1.35 ft^3 without sub). My question is... How many cubes per sub is recomended to have a good mix between spl and sq? Also...what should it be tuned to? JL recomends 1.75ft^3 @ 30.8hz hz....but that box seems really small.
posted
that box IS small for "self preservation" purposes. the suspension on that W3 will wear itself out in a heartbeat in a larger box, as the box volume increases, exponentially and opposite so does the life expectancy of said W3. tuning low is to give it a fighting chance against low cycle program material coming through, since it has no suspension or motor restoring force that will equal or counteract the flailing mass. if you tune it higher via a larger vent area, you will need an increasingly more reliable and well tuned highpass or subsonic filter to protect the sub. tuning low protects things, but at the expense of ultimate output capability. go with a vent too large and you will prematurely run into power compression with a mass of air trapped in the vent that is too high for the motor and cone to move an equal distance to it's attempted excursion. failure is shortly thereafter, always at the weakest link first. in short, in this case, for longevity and enjoyment purposes, you should stick with JL's recommendation. go bigger and more vent and you'll get more immediate output at a heavy sacrifice of life expectancy.
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