passive crossover. useless to tune with RTA?

[DefiantGSR 10+ year member]

Well, my setup consists of a pioneer 880PRS, Rainbow SLC components, and an ARC audio sub.

I was thinking about tuning it with RTA but am unsure whether its 'useless' to tune a passive setup so extensively. (Would save money from buying a pre-amp and mic).

To the more experienced, do you have any helpful input?

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