Hello Incognito,

It's true that bass frequency wave lengths are quite long, so I suggest putting the sub in the same place you plan to sit. Next, calibrate your sub so that it is 10db hotter than your other channels. Finally, walk all around the room while playing a bass track you're familiar with. When you find a place that the sub sounds really good, consider placing the sub there. Do this until you find a place where the sub sounds "right", and where it would also be in a place you can live with.

Best,

Scott