Crossover slope?

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I was wondering if a 1 order crossover is enought or for the double of the price a 2nd order one is very important?
I have a speacial things (for a friend that was requesting these spec!! what do you want!!)
He want a 10" sub that will began cut off between 80 and 100hz... And after it will be 2 x car audio 6"x9" in serie that will have the same cutoff for the high...

A lowpass crossover of 80hz is costly...

So I was wondering if -6db is enough.... The 6x9 go down to 40hz...

Sorry, I know that is strange but it's what my friend want :cannotbe:
 
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