different people may hear the same sound differently...

@teo_audio 

There is abundant research available indicating that there is indeed variation in both individual physiology and in individual psychology that results in differences in not only in interpretation of sound but also in differences in preference perceptions.

All one needs to do is look at the vast differences in successful audio products for proof that people have varying preferences/tastes.

Audio equipment is designed by most engineers to do one thing: reproduce an input signal as accurately as possible (at a cost point). Measurements are used by all designers in analyzing the success of their efforts. It is an indispensable tool. Some audio engineers make efforts to tailor the sound of their equipment to appeal to certain people who like/prefer certain kinds of distortion, or use certain kinds of distortion to cover other kinds of distortion in band aid like fashion, while others seek to drive distortion of all types below audibility. People that like certain kinds of distortion call amps without "clinical", "cold", etc. People who don't want distortion call amps with "warm", "inaccurate", "syrupy", etc.

Some want the signal delivered as purely as possible, others want an instrument. Some want to add tubes to their class d to get this added distortion, some like to use cables as "tone" controls. What is clear is that people don't agree.

What people should agree on is that ultimately, due to these differences in physiology and psychology, we all have different tastes and preferences and thus, there is no right or wrong way to enjoy recorded music. There is no "best" anything- there is only what is best for us each individually. "Class d sucks", "tubes suck", "digital sucks", "vinyl sucks", and on and on, is nothing but meaningless babble. We must listen and decide for ourselves- the personal opinions of others are can't be relied on, trusted, or assumed to be "truth" for people other than themselves. I laugh at how people get so worked up over this statement. When it comes to subjective matters of taste, we should all heed the adage "to thine own self be true".

One will save a great deal of time and money by ignoring those trying to tell you that this or that amp sounds "best" or that this or that amp is "junk", that they can improve your amp with their mods and take it to an "11". That only "true" audiophiles have tubes and vinyl. That cheaper components can't possible sound "better" than less expensive ones, and on and on. Listening for one's self is the only way to find the truth. The rest is all hot air.

when a person speaks, let's say in front of ten people, to most, the voice coming to them would be a non issue, but invariably to a least one person that voice would sound either outright annoying or subtlety not to their liking, or they all just won't have an issue with that voice. 

It's like when you meet someone, and immediately without any prior feedback of the person you completely dislike the person when everyone else is neutral to that person.

Biological fact is that all senses are somewhat different to various degrees from one individual to another. hearing is not different, specially since not two humans have exactly the same ears, ear canal, cochlea, tympanic membrane thickness, and brain receptors in order for us all hear a sound exactly as it is.  So, we all hear the same sound, but not exactly perceived by the brain the same.   

People hear differently. Duh. 

To quote the Firesign Theater's response to the auctioneer:

“How much do I hear? That’s metaphysically absurd, man! How could I know what you hear?”

Ha,ha! It's not only the ears that matter, but what's between them.