Hi Henry,
Avoid ‘Drum & bass’!!
To be honest, just go along to a decent Car Audio specialist, and they should be able to replace the speaker for you, no doubt with something better than the original Maserati supplied part.
Eurospares have a used one for £58, if you want to so it yourself you may need to fold up the rear seats (the rear seat bases pull up towards the front seats), to take the seat backs back to access.
Indeed, a great weekend for a nice drive…. We did!