Make sure that the RCAs and ground wires are as far away from each other as possible, especially directly at the amp.
Edit: This also goes for the midbass amp, not just the hi/mid amp!!!
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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