Did you figure out why the headrush died? I just got one today and had the same issue happen within a couple minutes. My kemper is fine, still work with a passive cab, or a monitor, The headrush powers up fine. I can headnoise within the speaker that lets me know the volumbe know is up, but I can't get any sound of it if I use direct out, or left monitor output. I only have the one 112 FRFR
Headrush FRFR
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I never did find out why. Mine did the exact same thing. The power light would come on and I could hear some hiss but no sound. Very strange. I just immediately went with a different product, the EV ZLX 12P, and have had no issues for well over a year now.
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Mine had a bad left input jack. they have sent me a new 112 FRFR and It sounds great.