Those look nice but ULS15 and VTF15 are pretty close in price esp since his budget is much higher. Seems like ported would be a good choice in his den where WAF should not be part of the equation. What are your thoughts on sealed subs? Do you prefer sealed? I have a sealed sub in my bedroom system, a Rythmik L12 and it isn’t prefect but it performs well in 1400 cu ft. My current thinking is I don’t really see an advantage to a sealed design when a ported sub can produce higher output.\nThere is one advantage that sealed can have in performance. Typical sealed low-end rolloffs are gradual, and this enables them to better take advantage of room gain when it can be had. In a small, sealed room, a sealed subwoofer can still manage some low-frequency output that isn't overly boosted in the low end. Ported subs have a sudden rolloff that won't benefit from gain as much, and where it does benefit, it can get too much of a boost since they can be made to have a flat response down to low frequencies. Some ported subs have ways of tempering their low end though, where there can be too much room gain that produces unnaturally boosted deep bass. SVS has their Room Gain Compensation setting, as well as a parametric equalizer. On top of that, you can run their variable tuned subs in a sealed mode. Hsu has their Q control, and also the ability to run in sealed mode. Other subs have similar features.