Cant say whether or not adding the second cable would have an impact on your subwoofer, but adding the cable from sub out to amp will certainly give you more control over the sub... I know I would add it.
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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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