Hello, I’ve had a big subwoofer with a final stage in the trunk of my e46 for 12 years now. Now I get offspring and need the space in the trunk. Reserve bike should also stay in it. Maybe it should be a solution for under the seat or so flat that I can somehow screw it to the walls or back seat in the trunk. I’m absolutely lay in the Car HiFi area. Can anyone recommend a system here? Can I possibly continue using my old final stage? h they at all? Thank you for your help!