I have a 15X13 HT. It's an extra bedroom in my modest home. When running Audyssey, it had me turn down the VTF3-5 down to almost the minimal the volume dial would go to hit 75 db. I ran it with both ports open and bumped the gain on the AVR +3 db. It sounded good. A very experienced friend came in and started walking the room, clapping, reciting a sentence ad nauseam looking for reflection points. He pointed those out where I need acoustic treatment. Then we fired everything up and he heard the sub rip. Immediately he had me plug the 3" port, and I set it back to EQ1. Then we ignored Audyssey, put the gain back to 0 db on the sub in the AVR. Then he had me increase volume on the back of the sub. It now rips, and I mean rips. It should work well for you. The tuning options make it an incredible value. Best of luck.
HT 7.1.4: Sony X940E, Marantz SR8012, LR: JBL Studio 580's, C: JBL Studio 520c, Surrounds and Rears: JBL Studio 530's, ATMOS: JBL Studio 210's, Sub: HSU VTF-3 mk5
MB 5.1: Sony 55" X950G, Denon X3500H, LR/Surrounds: JBL Studio 270’s, C: JBL Studio 235c, Sub: HSU VTF-2 mk5
Living Room/Office 5.1: Sony 49" 900E's, HTNT5's with wireless rear channels