75% is sort of an industry standard. Most of your distortion will be at volume levels above that point. Keeping it at or below means a cleaner signal to the amp.
I would do the same for the fronts as well just to protect them from being overpowered.
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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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