I don't know, I really don't think it will be a problem. If you think about it, air pressure in and enclosed space is linear, ALWAYS its a law of physics. If you add pressure to a space (sub compressing back) you add that same pressure to the whole space not just the part closest to the sub, then the vent will do its thing. It should be fine but I will find out soon enough sub should be here in about 4-5 days I figure.not a fan of the port bro..... could cause really im proper loading capabilities on the sub.....