I agree with gIzze that M DSP's are not 'bright' in presentation. I have listened to many other brands/combinations (won't name to offend) and find that often they (the others) do not suit long listening sessions as well as M. Listener fatigue kicks in my experience after a while.

Now, one might suggest it's because I'm used to the M DSP sound so as with all differences it takes time to adjust.

It's all about what your sonic reference point is. You only have to test 30minutes of your favourite music at 80 and then drop to 50. This is short-term but shows you how much your brain adjusts to sounds.

However, the DSP's don't miss any hi freq detail....it just doesn't jump out at you.

Other system tweaks can help with balance in addition to upgrades and firmware etc. +3dB is a good example.

Rgds,
Nick