I guess it's a little off topic here, but found this with a little googling: "Power amp is located in the trunk, left side, in the quarter panel behind the little storage bin in the side wall of the trunk or behind the 6 disc changer if yours is so equipped."
http://www.volvoforums.com/archive/threads/power-amp-location-44033-1.html
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Empeg Mk1 #00177, 2.00 final, hijack 4.76