If the AKG K701 is to bright and shrill run like hell from the Grado 325i .
I ran a pair in for 2 solid months and they never became bearable, much like having stinging bees in your ears.
The AKG Q701 has a little more thump and smoother highs than the K701,it is a different animal and I am upgrading a cable for mine now.
A head phone that is both dynamic and has more bass than all of the above is the Ultrasone HFI 780 a real bargain in the headphone world and if the track has bass in it you will miss nothing.

I have owned or still own and spent time with all of the above except the K701 I had on loan for 2 weeks.
So I can give a reasonable assessment of the headphones but my amp is a tube headphone amp and most likely sounds a little different than yours but most likely nothing earth shakingly different.