I had a friend with the same complaint ... My yammie was fine and we were both on stock settings . I tried his kit with my Audio Technica ATH- M50 phones and the problem was the lack of high end response on his phones.
I believe he bought a pair of AKG after that and everything's cool.
You can make adjustments to the individual pads via the rather clunky interface ( unlike the DTX-700)... I would dig out the user manual for the exact steps... Unless someone here remembers off the top of their head
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