Audio Volume

This question is more for my educating my curiousity, than for solving a problem, but when I recently replaced my Audigy 2 ZS Platinum sound card with a Xonar D1, I was satisfied for the most part, with one exception. While it is louder than the onboard sound, the maximum volume available is noticeably lower on the new card than the old.

Comparing the specs, the Xonar claims a 116 db sound to noise ratio, and the Audigy a bit less at 108 db. This would make it appear that the Xonar should be able of being louder.

The only other spec that I found that might relate is on the Xonar it states that the Output/Input Full-Scale Voltage is 2 Vrms (5.65 Vp-p), but I didn't find a similar spec on the Audigy, and am not certain how it would fit into the picture if I had.

The bottomline is if I should expect the Xonar to be capable of = or > volume or not?

Okay, that shoots down what I was thinking, but still doesn't explain why the maximum sound volume has lowered as much as it has. For instance, playing a movie in VLC, I will have the apps volume at max, the OS's volume at max, and the volume control on the HDTV, or headset at max, and the end output volume is quite sufficient, but it doesn't reach the level of my old Audigy card...or I could say that it doesn't Blast as it did before.

Since the system that I'm speaking of in located in my bedroom, meaning that a lot of the videos that I play on it are at night, it is kind of good, because the volume doesn't get so loud during commercials or during a noisy scene in the movie, like during a gunfight or battle, which keeps my neighbor from banging on the wall, but I'm still curious why that is?

EDIT: I should also mention that the volume in the Asus Audio Control Center is at maximum too.

No, no other differences that I know of.