There is no such thing as a neutral sound in reproduced sound and I am afraid there is no such thing as neutral sound in produced music either. I read a lot of reviews because I simply like to read reviews to see how other peoples perceive the sound of different audio gear and to see how they try to put into words what they hear. A lot of peoples use the word NEUTRAL to describe something they hear, neutral sound, neutral earphones-headphone, etc. Let's see, we have pianist X and piano Y playing in a studio/recording room which is dumped and we get a warm sound, then the same player with the same piano is performing into a concert hall and we get a different sound signature, let say a bit more "open" sound, then, the same player is playing on a stage on a free, open, venue, and we get another sound signature. Ok, which one is the neutral sound!? Things get more complicated when we talk about the reproduced sound. First of all, the reproduced sound suffers from different kind of distortions, time (jitter) distortions of the digital domain, DAC, phase (which is also a time distortion on analog level) distortions introduced by the speaker's filters and other analog filters (also cables), harmonic distortions made by class A and AB amplifiers, intermodulation distortions made by class AB amplifiers, etc, etc. All these distortions make the sound non-neutral. Even the cables produce distortions. Above all of this, the electric devices, active and passive, generate their own noise so that they kinda have their own sound signature. I don't go here on detail about distortions and noise. So, considering all of the above we can conclude that there is no such thing as neutral sound. But, when you perceive a cleaner and clearer sound and the right rhythmic drive, with a balanced tonal signature, you may perceive this as a neutral sound, but remember, is not neutral.