FastAndClean
Previously known as presata
bellsing drivers are not bad at all, if tuned right they can be good, for example the woofers on CCA C16 are great, very clean fast bass, also i have one earphone with 6 knowles and 4 bellsing per side, the bellsing drivers are for the treble, not at all bad treble, they use knowles dampers in the tube and the treble is smooth