Old post I know, might help someone else in the future. To get inside the door you have to work your way through the speaker hole when you've taken the speaker out, but main access is through the black plastic triangular section. Disconnect the cables attached to the front of it and the one that attaches to the door lock. Use a trim tool or you can even get it off with your fingers and it'll just pop out. Took me a good hour or so to get it covered everywhere. Tap the the outer door skin with your knuckle and it's solid as now. I've also got an InstalPro bass diffuser behind the speaker, the window just misses it when it's wound down.
I've just done my front doors with Focal Bam. I didn't do my research at the start so completed one door with Dynamat Extreme. Then Marty at FHRX pointed out that dynamat was no longer the choice to go with, and did the other door with Bam. The difference between Dynamat & Bam is night & day. Bam is so much more solid, absorbent, my doors shut with a solid bank vault like thud now. I then took most of the dynamat off the first door and redid it with Bam. The speakers now sound massively better with the Bam and I don't even have the amp hooked up yet, gone with an Audiotec Helix V Eight DSP Mk2. I'm now going through and doing the cargo area under the floor and lid with Bam and then onto the rear doors.
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