For people that hear normally, imagining hearing loss is difficult.
For those who want to get a glimpse, here's a link to the website of Phonak with some excellent examples of how things, environment, music sounds with and without hearing loss.... (See image below)
Will see if I can fin that site again. It gives an impression of the quality, but on the other hand, it cannot account for the brain to do it's job. (Found it - here for Adults, here for children !
People that have heard but became deaf, before explain that at first the sound with CI to be metallic-like, but the brain is quick to adjust it to "normal" sound - as it was before. I recall a man that recognised his wifes voice again after 5 years of deafness. The brain is a wonderful organ!
Anyway... "enjoy" these soundfiles!
For the researchers under us... this research (pdf) might be of interest....