When you tap the OEM speaker cables you are effectively reducing the impedance of the speaker circuit. I would think though that if you reduced the HU bass setting to zero/normal position that the HU amp will not be overloaded. That's because a large portion of the power supply gets used up by bass frequencies. Make bass adjustments on the aftermarket amp, not the HU!
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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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