I wanted to put in two 10" speakers without voiding the extended warranty on my brand new '15 car. They didn't want to try and help me with this problem & were quite rude. I tried to offer a solution of taking the signal from the 6x9's so as not to mess with the head unit therefore voiding the warranty. The response I got was 'what do you need me for then, you're the expert right!?!' So I'll be going somewhere else.