The JL Audio Tools app has a cool polarity checker and I found out that my underseats were connected with the wrong polarity. So in the end logic still prevails, but nevertheless it never hurts to check.
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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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