First off, the search engine in this forum does not work. I searched and only products came up, no forum posts. I have a square room with 80 package speakers. I had little bass. I was told to get another sub. I placed it diagonally in opposite corner. Much better. It is a sub I have to power with a monoblock amp. I have 7 monoblock amps I want to free up amp to upgrade to 7.1 and add a powered sub. My ep500 is old school and has a slotted vent at bottom. The new ep500 is sealed. Does this matter?