Pete himself has a vid where he discusses the TAE and how it is questionable. I think he mentions the safe bet is to keep those presence and resonance knobs all the way to the left. I'll see if I can dig it up.
Edit - here is Pete quoted on TGP:
"Mr. Suhr has a method to measure impedance curves, I'm not sure how he does it/what equipment he uses but you end up with an accurate graphic representation of the curve. He can do cabs, loads, etc. Was part of the development of the Suhr Reactive Load. MANY loads on the market don't really perform like a speaker cab, m really. Some closer than others. He measured his fav 4-12" and copied that curve identically for the RL. I mean you can lay the graphs on top of one another and they are almost identical.
The results with the TAE were, if you've got the resonance control all the way left, the amp is basically seeing a 20 ohm load down low (resonance), the Boss doesn't make a sharp resonant peak and then fall off like a true speaker curve- it stays high. So then when you continue to move that resonance control to the right, yes you get resonance but the curve just sorta "goes up" below a certain point and never comes back down. So way down low with the knob all the way right- 200 ohms. basically unloaded. Think what a boosted low shelf eq looks like- that's what the impedance curve looks like.
Depending on your amp, you may be fine, or worst case you may have a failure/cook your OT. And I've been told it could be a slow death potentially, like after a few years, hey why's my amp sound like crap.. oh flyback voltages slowly turned my OT to mush.. once again this is amp dependent. Germino says hell no that will fry some of my amps because of the design, the way they run on the hairy edge as it is, as part of the old Marshall sound.
I'm using one on tour so hey I like it but I'm not turning that resonance thing up and risking fuse/tube and or component failure, my SL68 is the first one ever made Proto 01. I wanna keep it functioning and original."
