I have a 4 channel amp powering (4) 6.5 speakers and a mono sub amp powering a single sub.
i listen to a mix of fm radio and music from my phone via Bluetooth. My head unit has no CD player. I can use the dd1 tracks either from a usb stick or via Bluetooth. Which is the preferred method? If using it via Bluetooth what volume should my phone be on? I assume then when listening to music the phone should be at that same volume? Thanks