Absolute PC heeft een review gepost van de Rio PMP300, de welbekende en veel te dure portable MP3 player van Diamond. Hier een stukje over de geluidskwaliteit van het apparaat:
The sound quality of the RIO was not surprising as I am accustomed to the great quality of MP3’s on the computer, however the bundled ear phones do no justice and were the first thing I changed as soon as I got the RIO. I was not impressed with the 64Kbps quality and would never listen to music if given a choice at less then 128Kbps which limits the RIO’s storage capacity to about 7-10 songs or 30 minutes of music. Other than those complaints with the unit itself, I was thoroughly amazed by the RIO and had quite a bit of fun with it! Sound Quality is not quite up to par with a CD however it is not noticeable except with the most detailed music.