So, I have these two things and I want to achive a good subwoofer for my car: an 5.1 home theater system with a 20-30w 4ohm subwoofer and a radio player in my car with 4x45w 4ohm output for speakers.
As far, I cleaned everything from the subwoofer(the amplifier for the 5.1) and now its just the speaker part with the 2pin cable. A tied with one of the chanels from the radio player, and its working, but.. The subwoofer gots the main signal and isn't sounds like before.
I mean its okay, but I want to cut off the high frequencies, because I hear like he wants to be a normal speaker. Any low cost ideas? I was thinking about a low-pass filter, but as far as I know I can't make it this way. Tell my if I'm wrong.
(It may sounds dumb what I ask, but I want a DIY, cheap method. This area its totally new for me.)