Anyone tired a Nordost QB4 MK III?

Thanks for the info.  Can you recommend a good power conditioner that’s not thousands of dollars?

Power conditioner that’s not in the thousands of dollars? If you can, run a dedicated line. 

Thought about a dedicated line,  but don’t think I want to go that route.

I delayed it and regret not having it done earlier. It’s a really nice improvement. I no longer use a power conditioner. Good power cords and upgraded outlets on a dedicated circuit take care of clean power delivery. I highly recommend it. But it’s up to you. With the power conditioner you need the best power cord feeding it, or at least one that’s equal your best power cord. Cheap power conditioner is the cure that’s potentially worse than the disease.