AiDee, if I understood you correctly, you also think that it is possible that a neutral sounding amp X can sound more bass heavy than another neutral sounding amp Y, if the amp X can produce more detail in lower frequencies (and in other frequencies too in order to sound neutral) than the amp Y ?
But could it be that before you are able to listen and enjoy the sound of the amp X giving you much more detailed info about the music/sound than your old amp Y, you have to first teach your brain to process/handle more detailed music/sound information than your brain is used to? And the more detailed music/sound information you teach your brain to process/handle, the more expensive amps, DACs, headphones, speakers etc. you are able to find enjoying/desirable?
And if we go back to Lieven's review related to Classic, it could be that the combo V200 and HE500/LCD2 may sound different to his the ears than the combo Classic and HE500/LCD2, because
a) V200 is not so neutral sounding than the Classic (i.e. V200 exaggerates something in the music more, lower frequencies and dynamics perhaps?) and
b) V200 gives you more detailed information about the music/sound than the Classic.