Well like I said in the first post, I was using the stock cables it came with, the buzz developed but at some point in unplugging and plugging components back in it went away.
I just got a new ZU Mission Phono cable which is well reviewed and should be much better. But when I installed it, the buzz came back. Talked to ZU and they said their cables are well shielded and they hadn't heard of this happening. They suggested I send it back for evaluation but before I do I'm trying to figure out if it's a ground loop or some other problem not related to the cable.