Is This Sub Powerful Enough For This Room?

I will be receiving my Velodyne DD-18 sub next week. I see a lot of people here using 2 subs. The Sub will be for home theater only. The sub has the room-correcting software and all that latest stuff.

I will be running a pair of Infinity Kappa 9 speakers full range for the rears. I will be using a pair of Infinity Kappa 7 speakers laid horizontally for the center channel.

My front speakers will be a set of Infinity IRS Beta.

Powering the front speakers will be two pair of Pass Labs X-600 monoblocs. Powering the rears and center channels will be Carver Silver 9t monoblocs for each speaker.

My processor is a Sunfire Theater Grand II.

The room is 70 ft long and 22 ft wide with a 20 foot ceiling. The speakers will be positioned on the long wall.

The front speakers have a total of eight 12" woofers and the rears have two 12" woofers each.

I have run a home theater setup in the past with the Kappa 9's as the front speakers and the Kappa 7 as the rears and no sub in this same room with good results. However in the past, I'd always feared the for the health of my woofers with the onlslaught of bass that some movies have and I don't want to submit my Betas to that kind of stress.

I'm wondering if the DD-18 has the testicular fortitude to provide enough bass for a room this size.

Click on this link to MyRoom
see my room. Click "slideshow" to view the photos.

thanks......mitch