ROCOO-C is an interesting DAP combined with the classical appearance and modern features. Compared with other two ROCOO models, The sound signature of ROCOO –C is lean to classical music acoustic and vocals.
The ROCOO-Classical has a built in Class A amp, which can have stronger power reserve for feeding...

Most of the features of the ROCOO-B are inherited from the characters of the ROCOO-A.
The main difference between the ROCOO-A and ROCOO-B is the amplifier. The ROCOO-A employs a Class A amp, while ROCOO B employs the Class AB amp.
The other features of ROCOO-B are that ROCOO-B has double the battery...

The bass of the ROCOO-A exactly reproduces the recording and so does not need to try and enhance it, as the light weight mp3 players do. We don't amplify any specific frequencies.
What the ROCOO is able to do, is to replicate, note for note, that live modern music sound, as if you were actually right...

The meaning of AMP3 is Acoustic, Amplifier, All-purposed, Affordable Media player. AMP3 is one model of PDAA. AMP3 is the only hi fi grade DAP in the market.

The Master combines with all the essentials of other models. For example it inherits the royalty reproduction merit, takes the good at the nature instruments performance of the Golden Hall, and also has the features of wide frequency response of Rock model.