I had one speaker not working and the other very crackly when I bought the car so today was the day for the speaker upgrade. Thought I would write it as a bit of a how to/ how I did it post for anyone interested. I wasn’t aiming for a significant upgrade, more a replacement so I actually had a bit of bass in the music. I knew the audio was already split so didn’t want to get coaxial speakers as the tweeter would be pretty redundant. I chose these speakers: https://incartec.co.uk/product/pio