I have two bookshelf speakers powered by a home receiver. I also have a car amplifier powered by a computer PSU (350W). Then I have my two 12" subwoofers. There is a positive and negative speaker wire coming from the subwoofers that can/needs to be hooked up to something. There is a Left and Right speaker wire coming from the car amplifier that can be hooked up to something. There is a subwoofer output plug on the home receiver. I have heard that this plug will not actually power my subwoofers. Assuming this is true, should I use my home receiver to power my car amplifier to power my subwoofers? What would be the best way to power them? Do I need to power them in series to create an 8 ohm load instead of the 4 ohm load each subwoofer would send by default? Thank you very very much for any advice you provide.