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<blockquote data-quote="JungleGym" data-source="post: 8085287" data-attributes="member: 653409">I have 4 <a href="http://www.sonicelectronix.com/item_34370_Alpine-SPR-60.html" target="_blank">Alpine SPR-60</a> speakers hooked up to a <a href="http://www.sonicelectronix.com/item_38338_Precision-Power-PPI-P900.4.html" target="_blank">PPI P900.4</a>. (I&#039;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 VACOr 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 <a href="http://www.crutchfield.com/S-YsbGUbpaGIO/p_500SWR1242/Alpine-SWR-1242D.html#details-tab" target="_blank">Alpine Type-R 12&quot;</a> and an Alpine MRP-M500 wired for 2 ohms.I&#039;ve searched around but haven&#039;t found any threads about setting HPF and LPFs, only mainly about what they do.Any help much appreciated.</blockquote>

[QUOTE="JungleGym, post: 8085287, member: 653409"] I have 4 [URL="http://www.sonicelectronix.com/item_34370_Alpine-SPR-60.html"]Alpine SPR-60[/URL] speakers hooked up to a [URL="http://www.sonicelectronix.com/item_38338_Precision-Power-PPI-P900.4.html"]PPI P900.4[/URL]. (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 [URL="http://www.crutchfield.com/S-YsbGUbpaGIO/p_500SWR1242/Alpine-SWR-1242D.html#details-tab"]Alpine Type-R 12"[/URL] 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. [/QUOTE]

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