1999 range rover sub install

[wild.gasgas]

i need to know what frequenzy the factory harman kardon sub is crossed over at i had to tap into the sub speaker wires to get a rca out but i think it is crossed over at a high hz like 60hz or 80hz i have two 12" and it just dosen't drop low hz it hits hard but thats it, what else can i do or use to make this work correctly.

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