Currently for fear of damaging the H9 I left it in the front between my Guitar and Amp input (front). However I want to place the H9 into my wet setup…this is not the FX loop (tube buffered)..it is a Line Level signal taken from the speaker wire. FYI the H9 has worked fantastic in my 5150 III 100S FX loop, I just want that cab to be dry now.
There's no risk of damaging the H9. The thing to worry about is if the signal going into the H9 is going to clip; that certainly wouldn't be good for your speakers or your ears if everything was turned all the way up. You might be able to do what you want to do even without the Line Level Shifter, but it should certainly work with the Line Level Shifter reducing the signal. You might want to try it either way keeping an eye on the input meters in H9 Control in the Pedal settings section.
