Help for a sub with Boschmann ALX122SP

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Hallo, I've bought this loudspeaker for a home sub, though I knew it's a car loudspeaker. I' ve put it in a 100 liter box and tuned it to 30 Hz with 3 tubes d=7,5xL=29cm but I am not sure that this is the best configuration. Have anyone experience with this loudspeaker, could someone give me more advises about it?
 
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