After another night's worth of research, I'm likely to go with a different amp (JL Audio 450/4, and install under passenger seat....which means I screwed up in buying the Alpine PDX 4.100; so if anyone is interested in taking advantage of my mistake, I will make 'em a great deal on the Alpine before I go thru the hassles of listing it on Ebay....

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I have good Ebay feedback (Audioclyde), but only as a buyer; for much more good feedback on a home audio site, check me out as "Rrsclyde" on Audiogon.com.