Warm up time for record playing

I've not encountered that. I've experienced warmup many times otherwise.

yeah okay.....

just find it odd that with all the posts / threads this has never come up until now ?       

this forum nowadays is totally crazy :) 

rvpiano, Of course the improvement is palpable. Why would the microphone changing it's sensitivity and frequency response be any different then your system doing that. I know for an absolute fact your hearing does this. Read any book on the physiology of hearing. Your ears and brain are far more flexible than your Hi Fi. People just do not understand how their senses can be so affected by the environment.  There is nothing about us that is static. 
Walk into a very bright room from a dim one (movie theater) and you will start squinting. Eventually things settle down and you won't have to squint...because your pupils have stopped down and limited the amount of light that enters your eyes. Guess what!  Your ears work the same way.

Chakster, it takes one to know one.