The AUX circuit filters out bass. I was going to measure it today, but didn't get around to doing it. It also adds a lot of hiss.
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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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