Everything about the sound is mediocre and earned a 5/10 and yet you somehow give a final verdict of 9/10. 

@Leftbehind I use a universal rating scale that disregards price so that readers can compare between my reviews. For instance, the Klispch S4 received 5's and 6's but retailed for $180 at release whereas the F1 is almost as proficient but costs only $20, garnering a higher final score as a result. I would hesitate to objectively score it any higher than average in sound quality, though for $20, average is still impressive since most $20 earphones are more compromised and are thus, below average in most regards.