I'm about the replace the modern radio in my car with a period correct 1970's radio, but the output on the 70's radio is mono, whereas there are two speakers in the car. I don't care about left/right stereo channels, but I absolutely can not put up with only a single speaker playing on one side; can I just join both speakers up to the single output? Or is this going to cause issues? I did ask this a few months ago, bit I can't find the screenshot I took of the answer I got, so I have to ask again.