What's the coil for? You can do 3 way active from your HU... I had the Pros but didn't run them active; just bi-amped them. Boston is sneaky about listing the specs on their speakers, so I don't know what the Fs of the tweeter is, but I'd say you could probably play down to 2.5kHz on the tweeter without a problem. But like Crossfired said, play around with it and see what sounds good. Your cars' acoustics and what not will affect the sound as well... so it's all about what sounds good to you! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif