I am already having E90 as my primary phone and N6300 as my secondary Phone, I want to replace N6300 with E51, Can anyone please tell me about the Sound output of E51.

Thanks In Advance

i find it good. if it lies flat on its back(also where the speaker is) it kinda bouces off the surface and increases the volume slightly more.
im happy with mine :)

Also, she's got "3-D tones" ( menu>media>3-d tones), kinda lends spatial effect on the sounds produced so they don't sound tinny. I enjoyed some Agatha Christie audio ebooks on it and it was even better compared to wearing headsets.