Amplifier question 2 ohm to 4 ohm speakers

[Jbock220]

I want all 4 channels run to each door (Alpine SPS-610 rear & SPS-610c w/stock tweeters front). If I buy Kicker's 800.5, can I run (4) 100w 2ohm channels to my 4ohm speakers?

As I understand it, this should put my speakers well into the sweet spot (slightly overpowered for 80w RMS).

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[Jbock220]

I think I figured it out.

I can raise the impedance on the channel, but not the other way around. I can run (4) 100w channels at 4ohm (even though it's listed as 4/100@2ohm). But on the (2) 4ohm channels at 200w I can't run 2ohm speakers (or a set parallel that load the amp up at more ohms).

 

[ISLANDPRIDE684]

The amp only sees how your speakers/subs are wired....an amp reads 4x100 @ 4 ohms, which means it will do 100 watts per channel @ 4 ohms...or 4x200 @ 2 ohms, 200 watts per channel at 2 ohms, or 2x300 @ 2 ohms (bridged) so on so forth....the amp will do what it says depending on how you wire your subs/speakers....parallel, series, etc....not the other way around...

 

[n2audio 5,000+ posts]

With a 4 channel amp and four 4 ohm speakers you're stuck with running the amp 4 ohms per channel.