It could also be psycho-acoustics. The 116s sounded different to what your ears are used to. You liked that new sound, assigning positive words to the characteristics you liked. Switch back to the 600s and those characteristics were gone. But after a few hours the old patterns you always did like came back to you.
Like trying out a new chair in the furniture store. Feels great! Get home, your old chair feels soggy. But an hour into your evening tv and that old friend feels great again. Maybe it needed to warm up a bit too.
Like trying out a new chair in the furniture store. Feels great! Get home, your old chair feels soggy. But an hour into your evening tv and that old friend feels great again. Maybe it needed to warm up a bit too.