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so do you know what kind of electronic crossovers ill need (or will a plan old 18db slope @ 4 ohms that all other crossovers are work)?

Yes, you need to do your research before just buying any thing that tickles your fancy. I used to use the D-20x's in a number of my cars back in the 90's. They are good tweeters, but, you will need an electronic crossover to get the best result out of them.

I see you just buying this and that not really paying attention as to what you will need in the future. Stop and smell the roses, then do your research before purchasing anything else. It will pay huge dividends in your overall SQ in the future.

Has anyone ever heard of the old school kicker d20x's ,I got 4 of them and I wanna throw them in my truck but they didnt come with crossovers it say on the box that there 6ohm and have a slope @ 6 db freq range of 3500 hz - 21000 hz can anyone tell me what I need?