I may suggest taking this route.... Sub running off Sub channel / rears running off channels 3 and 4 / front doors and tweeters running in parallel off channels 1 and 2.
you need to be able to keep your fronts and rears separate, so you can tame the rear channels. you don't want them anywhere near as loud as the fronts. the only issue I see would be the tweeters MAY end up with a little more power than you would like. you would need, of course, some sort of passive xover inline to your tweeters, and the xover point you choose would have an effect on the amount of power they see as well.
Did your Focals come with passives????
IMHO, This is going to be the a logical way to handle this issue. Your other option would be to add a small 2 channel to drive your tweeters, where you can make your xover point right at the amp, as well as control power with the gain control..
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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