you definitely need to add the caps to those tweeters.
.. ground loop noise, or alternator noise will change frequencies when the engine is at different rpms, and is fixed by grounding. White noise is likely a product of incorrect amplifier gain setting (too high), and can be heard without engine running.
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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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