Too soft? As in not loud enough? If that's what you mean, there's a hiccup in your set-up somewhere to iron out. Out of my DAP, which pushes a meager 150 mW, the X2 gets louder than I can handle and sounds pretty great in general. Maybe it is an issue of gain. These are easy to drive.
If you mean soft as in not enough slam or dynamics, see above. That's usually a sign of the headphone being underpowered or mismatched with the source impedance.
Anything is possible and I'm still learning the ins and outs, but my phones and amp have no trouble pushing M50Xs or A900Xs that have very similar specs. The A-100 could get it more than loud and exhibited the same tonal characteristics so tough to point at anything but the headphones and/or cable.
By 'soft' I just mean a pillowy and bass-heavy sort of sound that isn't terribly forward. Again, I totally get why folks would like it and nothing sounded off across the spectrum, just not my preferred sound signature.
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