I just promptly listened CAL and Studio Pros back to back and i have to admit that they werent as bad as i remembered but there is still enough difference that makes CAL better sounding overall. Oneodios are darker, hollower sounding in the mids, bass is more in-your-face + heavier (CAL retains better control to my ears), less airy, less separation/imaging (soundstage seems to be little wider) and maybe more grainy. In a nutshell Oneodio focuses more to the bass and leaves everything else slightly behind while CAL is more balanced. Not night and day difference and depending on ones preferences Oneodio might be even better sounding than CAL. I just dont like hollow mids or too dominating bass response.
Last edited: