thanks4help!! But i want to write me answer: is any potable players whose have frequency range widest than usual 20 Hz~20 kHz or whose potable players have the best SNR ??

But in my opinion unloses audio format (like FLAC) don't cause better sound quality if frequency range potable player is not enought wide PS Do you known any potable players whose have frequency range widest than usual 20 Hz~20 kHz ??

What is the best sound quality potable player ??