I recently replaced the rear "sub-woofer" speakers as the originals had rotted away in my vehicle. And? And it sounded terrible. Now I was getting the whole spectrum -or at least close to & the break up on the top end was nasty. What I didn't realize is that Subaru had glued an inductor on the basket/frame of the original speaker so that's in the landfill already with the blown speakers. So there was no low pass filter. That's why my new speakers were playing full range & sounded terrible. Well, inductors aren't cheap, at least not ones that you need where you intend to low pass around 100 hz, 4 ohm. Someone told me I could have simply wired a capacitor in parallel with the speaker & the high frequencies would have shorted there so that'd work too. That would have been like $1.57. I feel like an idiot for putting together a $40 crossover on speakers that are $10 a pop. I was going to post this on an audio forum, but those guys are biased & they all claim to have "golden ears" or something. Thoughts? & btw, if you can parallel a cap to a speaker to act as a lpf, can you then parallel an inductor to lets say a tweeter to act as a hpf? I understand this isn't, uh, very economical, but can you?