I have 4 Alpine SPR-60 speakers hooked up to a PPI P900.4. (I'm thinking about swapping in some Polk DB 6501 components for the front, any advice on that choice is welcome)

When setting gains with a DMM, when I calculate the voltage, SqRt(RMS x Impedance) = VAC, do I calculate for one speaker? Like this: sqrt(100 x 4) = 20 VAC

Or for the RMS of one set of speakers? There is one gain control for front speakers, and one for rear.

So would I calculate it sqrt(200x4) = ~28.28 VAC?

Second question, where should I set my crossover points using my head unit?

I was given an Alpine Type-R 12" and an Alpine MRP-M500 wired for 2 ohms.

I've searched around but haven't found any threads about setting HPF and LPFs, only mainly about what they do.

Any help much appreciated.

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