Join Date: Jan 2001
Location: Santa Fe, NM, USA
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Unless the speakers were specifically designed so that the ports could be plugged or open they will probably sound worse plugged. Of course you can experiment with a sock or some dense foam, but don't expect an improvement.
Probably the best thing to do would be to adjust your speaker placement. The bass "character" and performance of a speaker is greatly affected by where it is placed in a room (and also where you are in the room).
There are a thousand and one ways to decide on where to place a speaker:
1. Trial and Error - this can take forever.
2. Rules of thumb - the rule of 1/5ths or 1/7ths or whatever, these speed up the trial and error process.
3. Software - these greatly speed up the trial and error process. Do a search either in the archives of this board on a good search engine for "speaker placement software" and find something you like.