Can’t find this in the search (although I know is there). Is the Becker radio the upgrade?
This post by Roberto was good https://www.ferrarichat.com/forum/threads/finally-i-found-sub-woofers-that-fit-and-rock-in-addition-to-the-clarion-deck.482771/
I put one in my 360 Spider, it works well. The only thing that I don’t like is the fact that the radio is not flush and it sticks out and inch or so.