For the time I have two Earthquake Magma 12", but I still need more bass

Would you recomend another 12" og upgrade to two 15"? Or maybe buy subs from
another brand. I have a RF bd1501 to power the subs and wil buy anotherone
and use the powerlink.
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Det ER størrelsen det kommer ann på. 18" eller større
Kim Inglar
www.teamcamry.no