True, but it has been my experience with subs in the 10" range that they just don't offer the same feel as the larger drivers for HT. I would just hate for him to order the 10nsd and find it isn't up to the task either when I am quite certain the EP350 will do what he wants, but as you said, the 10 nsd would be a decent improvement over the EP175 and he would be happy as well.

I'm not helping much am I

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70