can you add tone controls to a primaluna HP integrated amp

Well it seems you are plum loki if you don't and a shameful person if you do.

I would consider buying an active crossover/room correction unit like the DBX Venue360. New about $750. Used much less. You will need to bypass your current crossover. 

Why? Because computers do room correction now so well you think
you died and were reborn.

I tried a Schiit Loki in the tape loop of my Pass XP-22 and it just killed the sound. Both the volume and resolution dropped. It may be due to my having XLR connections everywhere else. I suggested to Schiit that they provide XLRs. I only tried the Schiit as a solution for my vinyl source. I’m using the vastly superior Roon with DSP for digital. In my room my Vandersteen 5a Carbons sound too bright in the midrange at times. So I created a mid shelf DSP setting exactly matching the crossover points and 6db slope of the midrange driver. I created three versions with 1, 2 and 3 dB down levels. It works wonders at times. For the analog side, the best I can do for now is to run my MC cartridge load down at 100 ohms. I wish I had a much bigger room.

Another vote for the Loki, I use it between my source and a PrimaLuna Prologue Premium Integrated, it lets me enjoy listening to some recordings that are too bright and thin sounding. I have a very simple system and have it dialed in, great recordings sound wonderful, but a lot of my old Blues albums, specially live albums, don't. When I want to listen to those albums I flip the switch and it cuts down on the HFs and fattens the sound.

I’m sorry I just saw this. I have a Loki you could buy or just borrow. Good luck! It’s a nice device. Very quiet too. 

+7(?) Loki