Can someone figure out the gain of this amp?

Abery, I am not sure why you do not just try a " better quality " passive pre ( my Luminous is totally invisible, and fabulous ). I am not stating additional gain ( preamp ) is bad, but speakers such as yours, and the high gain of the STA200 ( not to mention, 1 less pair of ic's ), would be killer....I use my Luminous with a dozen or so rotating amplifiers ( not just the Nuforce ) and I get plenty of gain on every one of them. You seem to be all over the map, looking into every new product coming out. Contact Tim Stinson at Luminous ( tell him I sent you to him, as I was a beta tester for him, and I get nothing from this ), and he will discuss with you, with complete straight forwardness and honesty, the truth...( my unit is single ended, has 3 pr. of inputs, 2 pr. of outputs, has remote, and is silent ). ( Maybe, he can give you a 30 - 60 day trial, IDK ). The Luminous requires, ime, a few hundred hours of break in, as I believe, ime, everything does ) It is " night and day " superior to your Schiit SYS. Stop the insanity. Enjoy ! MrD. 

Glad to hear it. The SYS, along with the additional set of cables, would obviously be detrimental to the sound, other than for the purpose you initially intended. You should have, an almost new system, with it opening up. Enjoy ! MrD.