Wire speakers

[AnthonyG]

As I know I’ll get a bunch of questions on details I’ll add but first HELP from anyone electrically hip with electric / radio & speakers. So new radio is stereo w blue tooth & want it as mono & the stereo is auto no mono switch. As Id like to usie original speaker front & add a rear. Can I splice speaker wires coming out of new radio i.e., the left & right front +to+ & -to- then the same for the rear right & left to get all tracks to mono for speakers in car?
Don’t beat me up too much

Details: I’m putting a radio in my ‘35, original doesn’t work. Left the controls & face as they look cool. Got new radio & is going into my ‘35 Tudor glovebox . My original speaker looks good & want to hookup to modern bells & whistles radio as said will be hidden. I wanted to hear the original speaker to see how it sounds if good might use as e front speaker. Haven’t figured an inconspicuous place for rear speaker but maybe in front of bottom rear seat up against inside cloth.