when the extremes first came out the upgrade was 500$ or so.
i have a standard set of monos for my sub(one for each speaker -vmps large sub) and a set of extremes for my mains (4ohm 89db -3.5 way).
klause is on vacation right now till some time in august(its posted at his forum at audiocircle)he will happily answer your questions when he gets back-your better off asking him than us- he likes to talk.
p.s. go back to the odyssey web page, look at the very bottom and click odyssey mexico,then click the amp on the web page, hehehe the specs for the extreme and standard monos, its actualy a better page than klaus's
i have a standard set of monos for my sub(one for each speaker -vmps large sub) and a set of extremes for my mains (4ohm 89db -3.5 way).
klause is on vacation right now till some time in august(its posted at his forum at audiocircle)he will happily answer your questions when he gets back-your better off asking him than us- he likes to talk.
p.s. go back to the odyssey web page, look at the very bottom and click odyssey mexico,then click the amp on the web page, hehehe the specs for the extreme and standard monos, its actualy a better page than klaus's