Originally Posted by pimpg
Thanks for the help with this. I did as you said & it's working now. However, I'm concerned about the built-in amp being turned on in my h/u. The H/U built in amp is powering my door & rear speakers and the bta10100 which is already amped. This is a problem, isn't it? I don't have an external amp for my other speakers.
No need for concern. The internal amplifier of the headunit is NOT powering the Tube. All you have done is create a signal source for the Tube by using the High Level Inputs (or Low Level Inputs for that matter). By connecting to the constant and switched power source of the headunit you are simply using the factory electrical system for your power connections.