Subwoofers hiding in furniture

I made this subwoofer for my brother in law for his vacation condo. He wanted something with moderate performance, low frequency reach but not loud enough to bother the neighbors if a renter cranks it way up. But most importantly he didn't want a subwoofer box visible. So I went up and measured the height and style of the end tables in the room and then made a new end table with a subwoofer inside.

Here's the posting I made at Parts express since I don't have a good image hosting site set up for here:
End Table Subwoofer | Parts Express Project Gallery

I learned something along the way that might be really useful for you guys. Furniture is huge. This box only required about 1 cubic foot and I had a hard time making a useful end table small enough without building a box within a box. The point being, if you wanted to build a big 2-4 cubic foot enclosure for some monster sub this might be a great way to hide it in plain sight in your listening room even if it's only a "just for looks" piece of furniture.