I would suggest Bluetooth speaker. The new CX cars don’t have any stereo fitted and only have the Bluetooth as an option. Far easier as it means you can both play your music/radio these days at the same time as using the satnav on your phone. Seems to me to be pretty hassle free imo
Best wishes
HB

Plus Four Bentley Velvet Red “Grandi P”
Golf ehybrid thingy “Toadie”
Polestar 4 “Vger”