Headphone Reviewers will explain that "there opinions are only a personal one because sound is a subjective thing ."
The sentence should read something like 'This is a subjective evaluation of these headphones" .
Which is a very different sentence then stating sound it's self is subjective .
To show how completely inaccurate is the overly used phrase "sound is a subjective thing" statement, below is the dictionary description of the over used word "Subjective".
Sound does indeed exist in the brain as tiny electrical signals, as it also does outside of the human brain as vibration .Though sound does not "Belong" to the thinking subject and is indeed the "Object of thought" .It could be Argued that sound "itself" is also a thought process of the brain.Though that is delving far deeper into the physics of sound & should be reserved for another thread.
So,by reading the above dictionary reference, one can understand why many reviewers have got there wires somewhat crossed when using the word subjective to explain sound in there individual reviews of headphones .
And it can be understood that they are in fact wording the sentence "sound is subjective" completely incorrectly.
Sound it's self not being subjective to human perception at all . Sound is produced and defined by physical law.Physical law is not subjective to a persons opinions .
In fact saying "sound is subjective" is just like saying "Gravity is subjective" .
Which of course would be complete nonsense !