Anybody fussy about gaskets, could always look for craft foam sheet of around 2mm in thickness, it comes in black or grey if wanted. It's difficult to find in sheets bigger than A4 size though. Being non-adhesive it avoids sticking issues obviously. I use it for smaller drivers and tweeters, it's dead easy to cut. Last time I located larger sheets was in W H Smiths, but that was years ago. Specialist art/craft shops may be able to source larger sheets.
It is impossible for anything digital to sound analogue, because it isn't analogue!