Shure AD4Q Headphone LED constantly Red
This isn’t about asking for a solution (we already found the problem).
It’s more about putting this out there, since I couldn’t find anything about it online.
We used the headphone outputs of two Shure AD4Q units as Dante outputs in a rack to send signal to our intercom. Sounds stupid, but it works.
Long story short: someone turned on phantom power on the intercom base station.
Now both headphone outputs are dead, and the headphone limiter LED is constantly on.
Just wanted to document this: if the limiter light is stuck on and the headphone output isn’t working while the rest of the device works fine, it’s likely the headphone amp that’s fried. I could only find posts online about the whole device beeing fried when this led is on 24/7
Took me about an hour to figure out that phantom power was on and killed the headphone amps.