« Reply #30 on: February 06, 2014, 03:36:58 PM »
The danger is the devices frying, not the fried state. Put 120V across it and see what happens. That's a lot of heat that has to go somewhere. OOK, nobody will notice until they plug it into a miswired or faulty outlet. Those are rare, and these units probably aren't common enough to have found a bad outlet yet.
Also, all of the RCAs appear to be isolated, so there's no reason to further isolate the chassis from safety ground.
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No, its status as also a preamp wouldn't change any of my design decisions. There really isn't much difference between a headphone amp input stage and a mic amp input stage, except the mic input needs to be lower noise and higher gain*bandwidth. That takes a small amount of additional current per channel--say, 3mA instead of 500uA. Trivial compared with the required output power.
Thank you for the explanation. I will say that my previous living space was as bad as could be when it came to wiring so I either got lucky that the unit didnt cause any issues or the power conditioner in front of it is helping.
I can try and take a pic of my actual unit vs. the website pic used to see if there is any differences.
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