I added a few sheets of silent coat to my doors purchased from the sound deadening shop a layer behind the speaker mounting and a sheet behind the speaker on the outer door skin is a good start.
I made up some rings to fit the speaker mounts then bonded them to the mounts the screwed the speaker to them the added some deadening to the mounts
These where the mk2 speaker mounts and with the layer of deadening and The foam that’s on the door inner skin the mounts seal nicely .
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