MBP Retina 15'' late 2013 - worse sound than late 2012 ?

I used to have MBP 15'' late 2012. It had great big clean sound. Unfortunately it failed few times and Apple finally changed it for MBP 15 late 2013. I cannot get rid of feeling that its sound is not that good as the previous laptop. I hear some distortions in certain frequencies (that are distorted just on this laptop and nowhere else) and seems not so full and voluminous. Is the sound system supposed to be exactly the same in both ? 

savita88 wrote:
Could PRAM reset change the sound of the speakers ?
Try it and see (listen). It will do NO harm.
Ciao.

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