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I just got a new is250, with the nav but not the ML package. I wanna put in my subs and new speakers, but i dont know if changing any of the speakers will change anything regarding my nav. For example I know some speakers are muted when your nav directs you, will this still occur if i change out the speakers. Also is there anything that will be affected with the nav when i connect the subs? Thanks alot.
 

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I have a non-nav system, and I've added a sub, but haven't changed out any of the stock speakers - but I have traced the amp/speaker wiring through the car. The speakers run off an amplifier in the trunk. If you change a speaker, it should not affect the signal the NAV/head unit sends to the amp.
 
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