To reduce the alternator whine, you need to feed the power leads through a toroid core
Feed pos and neg wires through the hole and wind as many turns on as you can. Wind the neg on one side, and pos on the other. This will help cut down the whine a lot. I couldnt get my phone to work properly with the SR10, but paired it to my SMH10 instead. It can be a bit of a drama to get it paired in the right way. No experience with Aldi stuff, as we dont have them in the west.
I will see if I have a core, and put some windings on for a pic so you can see what I mean about the windings. Its all to do with opposing magnetic fields in the winding.