Cowon volume 34, BBE +8 Mach3bass +9 is normal for me.
Can you take a vid of your pro's hitting as hard as the sz2000 with the 55x pads please.
I was unable to cause head thumping with my beats. They are loud bass like the SMS but they don't have the same impact. Not very close actually. If you can show us otherwise please do.
Videos are held in very high regard here.