Neat installation Stewart but you say you took power for subwoofer direct from battery. Can I ask what control you have for turning subwoofer power off when car/radio not in use? Hopefully the supply has its own suitable fuse as well.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone