Hey all. Im rearranging the furniture in my living room( the other half is wanting a different look). As a result, the HT speaker setup is changing positions. My sub will be placed near a corner boundary....I'd say about a foot and a half from the side wall and about 4 inches from the back wall. My question is since my sub is rear ported, is that enough room for the port to breathe?? Is there any rule of thumb about the distance the port has to be from a boundary (or in this case the back wall). Any info or suggestions would be helpful. Thanks.