use in my cars stereo.? Pleas read this carefully, I posted this before but nobody read it and just copy and pasted there answers form other questions. I have a 4 ohm home theater sub. the DOES NOT have its own power supply, again it DOES NOT have its own power supply, meaning I don't have to plug it in to the wall or anything for it to work. I want to hook this up to my car stereo which runs at 4 ohm also and I want to know if it is safe to do so before I do it. Again its a 4 ohm sub that does not require a power supply (meaning I don't have to plug it in anywhere except to the receiver). I am sorry if you think I am talking like to a child but I have asked this question before and everybody just sees home theater sub and copy and pastes the answers from other questions like this one.