Crossover is set at 80 with towers set at small. Room is small only 12x18 with a 3ft. opening. I was hoping to hit around 20hz when plugging. I only have sub volume set to four so plenty of room yet. I can only place the sub in two positions. Tried both places sounds the same. Don't get me wrong I'm not complaining just want more(lol). I don't have anything to check it with just a SPL meter. Just wondering if I plugged a port would it go lower and if so how much.