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I have another thread asking about adding the Harman/Kardon power amp and speakers to a 2019 Impreza Limited with the basic sound option. I came across a good deal on a WRX set with the power amp, H/K speakers AND the subwoofer that goes behind the rear seat. The Imprezas, even with the premium sound option, don't have the subwoofer. Is it possible to add the WRX subwoofer to the Impreza by adding wiring between the subwoofer and the power amp module? In other words, will the H/K power amp module recognize the H/K subwoofer, or does the communication between them involve the ECM (or the main bus)? Has anyone come across this mod?

Thanks for your time,
Charlie
 
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