Low buzzing through speaks

Hi All, 

So at this point having ordered the 2  Pro Co XLR adaptors referenced by dpop I'm thinking holding off until they arrive before trying anything else at this point. But I may still try the RCA's and see if that does anything? I think the gain on the XLR between the Sim and the Mac sounds like it could be the ticket (but I have absolutely no idea as this is way beyond my limited knowledge here) but hearing the phrase "2 components not playing nicely together" several times this sounds like exactly what is meant? If this is the issue and it seems so many have this kind of issue it's weird that you don't hear much more about it when matching separate amps to separate pre's? You would think this would be publicized more about using caution or being aware of this potential issue, no?

@dpop just PM'd you...

What a whirlwind this has become and @russ69 and @dpop I honestly would describe it is a combo hiss/buzz. Here I am now listening closely like a critical listening session to describe it, LOL!!! That's awesome-still keeping the sense of humor especially after reading that article again from Upscale and the new shot of enthusiasm and hope provided by the incredibly selfless @russ69 ​​​​@dpop! 

Question for @russ69 , why would I need the XLR RCA adaptor in my situation? Wouldn't the XLR 10 db attenuator pad attached to each of my XLR cables work?

Wouldn't the XLR 10 db attenuator pad attached to each of my XLR cables work?

Yes, it would. 

BTW, I had this issue with my Mac402 amp. The attenuator did the trick. 

I had this interference both static and hum. The static turned out to be my cell phone and the hum was fixed by better shielded interconnect cables.

You know what is weird? About 1 1/2  years ago I reached out to Simaudio (I bought my Titan amp used 2 years ago and realizing this piece although in amazing condition and was sounding just amazing, it was approaching 20 years) to see what if anything I should do to care for this unit. They recommended sending it to them for "cleaning and calibrating". So I did. Knowing I was going to be without the unit for a few months I bought a Monolith 5 channel amp as a backup (the price was right at $1599 at the time) to get me through. Once I introduced this unit with my Marantz AV8802A, there was a faint hum/buzz - come to have been thinking about it it was very similar to what I have now - but chalked it up to this being a lower end and knowing it wasn't there with the Sim, I wasn't too concerned. Once I got the Sim back and connected it, buzz/hiss gone. I just remembered this today! And from what I recall it was very faint and didn't change volume wise like this current possession of my rig! 

Just maybe the lifters or the attenuators will be the proper exorcism to get rid of this particular evil entity😂🤞