I tried, for fun and just for a quick test to try stuffing bass ports. Here's results. I didn't really listen to at all settings, but took measurements. Only listened with stuffed and +-0 settings. Didn't really like that much it because the lack of bass, even its extended lower. Looks were horrible too, when stuffed just socks in them LOL!
They're pretty high res graphs, that text come little to distract, still readable.
Thanks. Bass reflex is not my specialty, that's for sure. Have you read the wikipedia article? It's not that ported speakers are boomy but they do appear to add some extra decay to their frequency and below.