Since it sounds to me like you already own both the head unit and the amp, I would definitely run it active off your head unit. It is, as BigA said, more labor intensive to tune this way, but the benefit of having so much more control over your crossover frequencies, and slopes, as well as db levels for each driver is a definite advantage over the passive crossovers.
One thing I do recommend is to find out what the high pass freq. is for your tweeters on the passive xovers, and stay at or above that level to prevent damage to your tweeters.
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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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