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Title: Agree with Johnny
Review: I also tried to use this to boost the very low audio from the AVIC-F500BT and it introduces a significant amount of engine noise from the power line without any direct ground except (I assume) through the RCA's (who wants that??). I'm surprised it wasn't designed to eliminate this as other inline boosters do - very poor design and one that isn't very functional without adding a filter.I do not recommend this product, but if you do use it, be prepared to get a filter to remove the engine noise.
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