Sharky Extreme heeft een review van Diamond's portable MP3 player. Hier een stukkie over de geluidskwaliteit van het dingetje:
Where the Rio leaves much to be desired however is in its overall music playback quality. Even when the MP3 files are encoded at their maximum quality level (128kbps, which sound exquisite on our standard Cambridge Soundworks Desktop Theater speaker/subwoofer setup), the Rio fails to impress. Bass reproduction is nonexistent, sounds using treble are somewhat flat, and the midrange is relatively muted. It's not "AM Radio" bad, but it isn't the level that readers are used to hearing from their portable CD players either. The Rio does includes a button to change its internally preset equalizer to one of four modes: Normal, Classic, Jazz, and Rock. The problem is that the unit's sound reproduction is so limited that the EQ settings don't make a whole lot of difference to the overall listening experience.