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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.)

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  • \$\begingroup\$ A series inductor (coil of wire) of sufficient inductance will cut the high frequencies. \$\endgroup\$ – Aaron Aug 11 at 0:38
  • \$\begingroup\$ I think you'll find that's a good thump in a car you need more than 40 Watts... \$\endgroup\$ – MadHatter Aug 11 at 1:10
  • \$\begingroup\$ Welcome. Google Amazon or Pyramid Audio for "subwoofer filters". Just buy something already made on a small board. The cost is ok unless you need something to handle hundreds of watts. We can give you equations, but winding air inductors with medium/heavy gauge wire is tedious... \$\endgroup\$ – user105652 Aug 11 at 1:53
  • \$\begingroup\$ ^^^ ALOT more than 40W. And forget about a "passive" filter (i.e. coil of wire)... A simple 1st order filter like that isn't going to have a sharp enough cutoff to do what you want. DO as above suggests, buy a pre-fab one. They're available on Amazon for like $10 \$\endgroup\$ – Kyle B Aug 11 at 16:11
  • \$\begingroup\$ Did you use the .1 channel? \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Aug 11 at 21:37

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