The enclosure specs itself are fairly decent. In terms of you scared of it acting leaky because the port is so close, no, it will not. Think of it like this- When the sub is put in a volume, regardless of where the port is, the volume is what influences the output capability. The smaller the volume, the more it likes higher notes, the larger the volume, the more it likes lower notes. Where the port is does not change that. However, placing ports in different sides of a box can greatly effect SPL based on firing direction, 1\4 wave theory, time-alignment theory, etc. But it does not negatively effect how the sound is pressurized. Do not think that the sound must "pressurize" and then look for an exit.. Instead, the volume itself influences the SPL capability of your playable range before any sound is even present.. That should change the way you think about it. Now, I hope you properly obtain your desired tuning frequency using a port that large! 6" Aeros are usually always enough for a single 15 for daily FYI.