1968 Barracuda Dash Speaker Access, Size & Replacement

Sadly, I'm a bit of an audiophile, so intending to put a higher-end system in (more $$$), ideally an aftermarket retro fit with a separate amplifier. My time in the car seems to be were I get the best opportunity for listening to music these days.

@Dana67Dart thanks for the details on removal. Interior is being finalized next week and the seat is already out (good news for a change) !!!