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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8115303" data-attributes="member: 576029">whatever you use to close the hole should be removable.  those holes are for repair access.the material should seal to the opening, so when using aluminum or sheet metal use some foam weatherstripping (resolves the galvanic issue).I use wood but have to waterproof it, i recently used 3/4" birch wrapped in CCF.the goal is to increase rigidity as well as sealing the opening.  MLV can create a seal but won't be a rigid opening.  it will react to midbass and can cause phase interference - acting like a second speaker diaphragm or passive radiator.</blockquote>

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