Question about Pioneer SHF21LR Speaker

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Help Me plz

Hi,
Im new to this site.
I hope i dnt cause any confusion by posting in the wrong section
I have a Car Subwoofer equipped with its own amp, and i wanna hook it up to a home system.
If i plug the wires directly into the speaker coming from my home amp, bypassing the amp on the speaker, i get extremely low volume.
And i don't know where to hook up the Ground and Power wires coming from the speaker amp.
Thanks a million

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