Thanks guys. First i live in canada, so i think it will difficult for me to make a sound test in Michigan ;-). but thx for the offer i appreciate.
Of course, each music player have a sonic difference. IMO Itunes is not the best, that's why Amarra and PM exist. I am not sure that Front Row use that same engine than Itunes. I think it's different. Front row is also used on Apple Tv and there's no Itunes in an Apple Tv. I think that Front Row have is own engine and that's why Amarra and PM don't work. So if the engine is differente the sound could be also different.
What is your opinion ?