Low output / just ok sound?


Just started experimenting with Hi Rez downloads. I have a few from Acoustic Sounds, HD Tracks and Sound Liason. I am using Windows 7 pro using the Asio driver setting outputting via USB to an Oppo 105D. What I have noticed is I must use what I think is a significant more amount of volume to match the levels from the cd output of the 105. The downloads sound ok but not as good as by best SACD or CD's. Other than upgrading the above equipment is there anything I can do? Is the lower output normal.Any suggestions would be appreciated.
Thanks
bufford
thanks for the replies.I understand there are differences between different sources this just seems a little extreme.
I have not listened to a ripped cd for some time but I don't think there is a difference with them.
The 105d is asynchronous and I am using JRiver. The computer is an HP probook nothing fancy. I'll have to check software volume controls, if I can figure out how! not much of a computer guy.
Thanks
"I have not listened to a ripped cd for some time but I don't think there is a difference with them."

You need to try everything or you'll never fix the problem. Who knows what kind of processing was done to the downloads you bought?

Make sure that nothing in your system is using replay gain. If something is, disable it.
I have changed the volume settings in Jriver and all is well.It takes some time to learn Jriver believe me I'm not there yet.
Thanks for your input guys.
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