Go get out your pitchforks, I’ve done a sacrilegious thing. . .

I have an original Loki, and I find it useful in my main system as a tone control, mostly for rolling off the highs that hurt my ears on certain recordings, but also for ‘taming’ voices (usually male) that grate a bit, and finally to boost, or quell the bass, again, to ‘tune a track’ or ‘tame an artist (or album).’ If I’m having problems with the room, I’ll use the balance control. Otherwise I’ll ‘adjust my ears,’ if you know what I mean. 
 

I don’t find the Loki to be dead quiet in my main system, a bit of graininess pops up when I switch it into the system, which I attribute to it’s solid-state construction, it raises the noise floor just a little. It is a relatively small price to pay considering its benefits, and especially considering the price I paid for it. I’ve wondered whether or not to step up to the Lokius or the Loki Max. I can switch my Loki in and out with my main system remote, but it would certainly be nice to make adjustments from the listening position. Perhaps then I could join you in employing it for room correction. 🙂

I must admit that I can’t really make sense out of Schiit’s technical explanation of the Loki Max circuit topology except for the description of their fancy inductors, although I am intrigued by the fact that it seems mostly passive. 
 

Thank you for sharing your experience. 

Another convert here.  I have the Max for three weeks now.  It does work well for bad acoustics, no speaker placement options and no room treatments allowed crowd.  Remote presets!  Priceless.  

I have 3 tube preamps, all with tape monitor switches and/or processor loops and a Loki+ which I agree is a useful and sonically uncompromising device. Only one of my preamps has tone controls of its own, and Loki is more subtle in its action, so I prefer it to the built- ins. 
AVA Super PAS, VTL 2.5, Marantz 7C. 

Does it work for all the types of music you listen to on one setting or do you have to keep adjusting with different songs? If so isn’t that too much of a hassle ?

I agree that if your listening room can't be properly acoustically treated because of your wife, the Loki Max would be a welcome addition.  Or celibacy a welcome subtraction.