Quote Originally Posted by F6Pilot View Post
I don't think the depth is the limiting factor as their is only 4mm difference in depth between the 5.25" and the 6.5". The problem is in the total diameter that runs the full depth. The magnets and the supporting metal basket are huge. I was able to install the previous JBL 6.5" because they were shallow and the metal frame supporting the magnet sloped inward. The Hertz are almost the same diameter, like a cylinder. I can get pictures this weekend to give a visual because I know it's clear as mud.

I tried this at the installer as well, the magnet is so wide there is no way it will fit. Based on my measurements, even if you remove the black plastic enclosure, the brace behind it would be in the way. The only other option would be to check Focal 6.5 to see if the magnet might fit. As long as you go with their top-tier line you should get the same or better output at the Hertz. The 5 1/4 are monsters - they are what the pros use on high-end boats and other installs that have limited space.