In preparation for some dash work on my 69 fury I thought I should be ready with a center speaker replacement. I know there are other simpler options out there but this is what I came up with. Its a convertible so I knew I needed speakers that could play loud and take some power (i will be adding an amp) On measuring the stock speaker mount it was clear that it could hold up to 12" wide with cutting. So 4x12. The dash pad holes are also about 12" wide. I kept the original studs in their location so the original speaker could be used again if needed. There are many options for speakers and probably 2 4" coaxials is what most would choose. But I found these 4x6 plates at good price because they were damaged. These Infinity Kappas are high sensitivity, decent power handling, and known for being bright and cutting through the road noise. But I didn't leave it there I made a box for the back of it and added some passive radiators. If you look at a mid size bluetooth speaker this is how they produce as much bass as they do. To be fair I have no idea how much bass I'm going to get but it will be more than leaving the backs open to the air. I covered the box with Peal&Seal roof flashing (lowes) as sound deadener because the box is just pop riveted aluminum sheet metal. Kind of flexible. I dont have AC so the box wont hit any ducting. But to be honest I'm not sure how well it will fit. I'll just use the box for something else if needed. Once I'm done putting everything together I'll test it and add more comments, but it wont be installed until the fall. If you want links to the parts I can do that too.