What version of Pandora are you listening to? The free version is low bitrate MP3. Even Pandora One (premium version) is only 192kbps MP3, not high quality except by comparison to the free version.
I do not know what the rest of your system is but, judging from the fact that you have a BDP-105, it is likely that it is good enough that you are hearing the limitations of the source material. You need to find another one.
I do not know what the rest of your system is but, judging from the fact that you have a BDP-105, it is likely that it is good enough that you are hearing the limitations of the source material. You need to find another one.