The way the system is setup you have the factory radio which can produce up to 4 channels depending on the source. The Bose amp then divides these using crossovers for each one of the 7(including sub) speakers. The Bluetooth device usually a phone is set up to run stereo headphones, therefore: it goes from 2 to 4 to 7 different FREQUENCIES, but the signal is just right and left . Although the amp and radio does a great job at hiding this that's the reality of the matter.
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