Could be a number of things. Not sure what you are using as a reference.
Maybe you are just not used to the extra detail.
The DAC needs to break in.
In my experience DACs are extremely sensitive to cabling. A good quality USB cable makes a big difference, as does a 'glass' toslink cable. Also the interconnects from the DAC to your Exposure is very important, and can totally change the tonality of your system.
Finally, not sure what you are using for music - internet radio, downloaded files, burned CDS? Most compressed files (MP3 etc.) sound pretty poor, thin.
Maybe you are just not used to the extra detail.
The DAC needs to break in.
In my experience DACs are extremely sensitive to cabling. A good quality USB cable makes a big difference, as does a 'glass' toslink cable. Also the interconnects from the DAC to your Exposure is very important, and can totally change the tonality of your system.
Finally, not sure what you are using for music - internet radio, downloaded files, burned CDS? Most compressed files (MP3 etc.) sound pretty poor, thin.