What does 'cold' mean? What does 'warm' mean?

Zufan, You are  right! So much for my editing skills.

The first sentence should have read "Cold = decrease.......". 

But the good part of this is I now know at least one person was reading my post. :-)

Cold- analytical, inhuman. Warm- emotional, human.

To state the extreme. Cold is a PA horn speaker and warm is all sound coming from a bass speaker. In hi-fi it's not that extreme but that is the gist of it.

Cold and warm are subjectively attributed to sound but anyway very real experience of perceived sound phenomena....

It is a characterisation of the musical timbre of a specific instrument playing in a specific room from a specific audio system, coming also from a specific recording room, which may be perceived wrongly in two different directions of the spectrum frequencies, because of bad electronical design from the recording gear or/and from the listening gear or from very bad rooms embeddings or from the 2...

But People in general prefer between 2 wrongs the least wrong one or the least agressive one, then in general the warm sound is prefered and associated with heart and body, the cold one with the brain . ... Then warm qualify something more human; cold, something more artificial...

But if the audio system is a good one, turntable or dac, S.S. or tubes; if the audio system is rightfully embedded in the house/room, the rendering of the musical specific timbre of an instrument and his perception will be very good, then relatively neutral, nor warm nor cold, because the timbre is not only, a colored-frequencies phenomenon, it is mainly a time-timing- of many sound aspects-events in a specifically acoustically designed recording and listening rooms...

A good room, a recording one or a listening one, must be the more neutral possible for frequencies perception spectrum then the complex timing of events that constitue timbre will be rightly perceived...

I look at these two terms somewhat differently, or at least use different adjectives to describe them... cold/harsh... warm/smooth, pleasing. At least to me, that is what I hear.

You are not alone, rejoice! 😊

But audio experience cannot be reduced to these qualifications....They are too gross...Audio experience is linked to the more deep question : Is the recording of this piano timbre like my audio system render it to my ears, in my room acoustic, is this piano timbre natural ? Neither cold nor warm, just right and more neutral than not ,and natural like in real life experience?

This is the question....

Happy New Year geof3....