I'm going to replace the standard CD player in my Mk2.5 focus with a tablet, but I'm looking for a way to connect it to the speakers in the car. I've seen a lot of cheap amps that will take a 3.5mm cable and connect to the speakers, but there's no way to change the volume without direct access to the device and I want it hidden away behind the tablet.
Ideally, I'm looking for a simple amp that takes 3.5mm input (and/or bluetooth), is always turned on when the ignition is on and can be controlled using the volume controls on the stalk behind the steering wheel.
Has anyone come across a device that can do this? If this doesn't work, I may just end up buying a standard single-DIN stereo without a CD player and mounting it behind the tablet and just hoping that it always comes on with the ignition and stays set to AUX mode!