Box volume to account for sub displacement

[nerraD]

Hi. I'm currently working on a sealed enclosure for:
- 8-inch Momo Sub, SVC

The Polk website and owner's manual suggest a sealed box with 0.35 ft^3 internal volume.

Does this volume already account for the displacement of the sub itself? In other words, do I actually need to design the box a bit bigger (say, 0.4 ft^3 internal volume) to account for the volume displaced by the sub itself? If so, what volume should I use for this sub, to arrive at the final desired box volume?

Looking forward to any feedback. Thanks!

[MacLeod]

The spec is for .33 total box volume. You dont have to add anything for the sub.

[nerraD]

Good stuff... that's what I was hoping for. Thanks for the reply!