50 watts should be enough to get plenty of output from your mids.

I would go active just like everyone else has said. You might want to try it both ways to hear the difference for yourself, that way no regrets and you get +1 experience points haha.

When I went from passive to active with the kicker resolution set a few years ago, it was almost a night and day difference. Not so much so with my canton set, obviously it varies depending on the passive xover.

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"36hz is the precise frequency for hard hitting base"