I can only compare Monster,Shunyata and Torus,
Why do I even mention monster.
Torus are a superb PIU and shunyata does not even come close.
Their pricey,rare on audiogon or any other site.
the ones that were for sale,the owners went to a bigger Torus.
I picked up a 10a Torus here,just for one of my subs.
I have seen 4 here and my friend picked up two,I picked up a 20a balanced and of course the 10a Torus.
They are transformer based,so for the dynamics of music, they give your amps more amperage when the amps call for it,
50-400a on short term.
these babies take your audio to another level altogether,
MUSICALLY speaking, and you really hear it and that's why
I would never part with these,there that good as I'm sure there are other's.If you can audition one,I bet she won't leave the house.