Help with buzz / hum that's making me insane r

The hiss with your ear next to the dome tweeters means they are working. Agree with Herman it's not a malfunction. Advise you not increase the volume above normal listening levels to listen only to the hiss.

You can lift ground by adding a two prong cheater to the end of a three prong plug. So long as one component is properly grounded all the others linked via interconnects will share that ground. That's why if you did have hum, which sounds like you do not, the hum will persist even if the offending units are turned off but remain connected.

Dissatisfaction with the system's sound indeed indicates distortion. Surely it has nothing to do with your operating dome tweeters.

Enjoy that pretty room you have but move the carpet over so it's centralized equally between your speakers.

Thanks Rockvirgo, I am moving the carpet tomorrow. Can't believe I never picked up on it. I have been, and am still VERY happy with my system; however, in thinking about my hiss issue, I've decided there are two separate things going on:

1) The tweeter hiss is perfectly normal and only audible if ear is at tweeter
2) I could have a sibilance issue do to recabling and adding new ICs

Assuming the sibilance is cable related, I guess I'm wondering what to do. I didn't notice it before installing the Nordost cables, so I will swap them out and see if that is the issue, although I'd be surprised (wouldn't be the first time). If that's not it, I'm wondering what my next step should be. My speaker cables are 3 meters, which is more than I need, so I've got the excess length coiled under my stand. I had them this way before the sibilance became an issue, although I did recently remove them and put them back in, and I know purist cables are thought to take a while to settle back in, so maybe it's just a waiting game.

If it's not the SCs and not the ICs, then what next? From reading other descriptions of this sibilance issue from other people on the net who've experienced it, I'm pretty sure that's what's going on.

Should I clean my connectors? cap off any unused inputs on my integrated?

Fold the excess speaker cable concertina style (like an accordian) back and forth like a sine wave instead of round and round. Coiled wire behaves like an antenna or motor or something. Best of luck finding the sibilance.

Don't feel stupid, feel like you learned something.

Could it perhaps be the recordings, I believe you mentioned it doesn't happen on all and it could well be that a particular recording is overloaded. Can you compare one of those recordings on another good system?

That's what I'm going to do this weekend hopefully. I talked with Grant from Shunyata who was extremely helpful and am going to test out some other things as well. I gotta say, I am blown away by how much time Grant spent with me, and how insightful he was. Excellent customer service.