I'm a singer in a group so mtal j'hurle a little, and with pro MusicSafe I too feel the effect "head in a jar."
And howl with the head in a jar, first piqued a little eardrums and means absolutely nothing.
So I adopted the solution that I advise all those in my case:
In-ear earphones SHURE SCL2 me protgent big sound of musicians and in which I balance my voice back .. To each his return mthode, in my case it's pretty simple, I use a pedal effects with a headphone output.
This is the perfect comfort, a attnuation without much loss frequencies and the pleasure of hearing his voice above the rest.