Ford Escort Bj 93 – Question on the installation of subwoofers

Moin young, I’m new here, as you can see Just imagine me quickly: My name is Pascal, I’m 18 years old and I’ve had my own and first car for 2-3 weeks. Nen Ford Escort, Bj 93 16V 1.6 liter 90 hp. I’m very satisfied with it but I’m not allowed to drive yet because I’m still driving the driver’s license but won’t last much longer Have a question about my power amp and nem subwoofer. So it looks like I have two boxes on my final stage ( McFun B-Force 800 4 channel ) now. M a radio is one of Medion, that I gave from the car of my parents, ham se me ^^ resp. we exchanged since I had previously an older one in it but also with MP3. Anyway, this from Medion has only 1 pair of chinch outputs. When I installed the power amplifier with my colleague today and the cables have laid clean he later noticed that I could get problems with the subwoofer. I have to buy now definitely a new radio with 2×2 chinch outputs o I can solve this differently ? Would be very grateful for your help Wouldn’t want to buy a new radio right now but first ask the experts here