Do you know about how may hours you have on the MCo.5s? Rick from High Fidelity told me they would go dark after a while then open back up better than before. He did not say what the hour range is. Did you find them dark from the start?
Plugged in Sat 11:30pm ... do the math.
With a new toy, 1st day focus on positives but did noticed hardness with some material. One is Vanessa Fernandez - Use Me. Subsequent listening sessions found more material ... Natalie Merchant Tigerlily ...
I tried different combinations and found 1 MC 0.5 in the open wall outlet shared with amp's Weizhi a good compromise.
Currently have them plugged into open outlet on a Weizhi and wall outlet shared with Weizhi's for TV, cable box ... I bought several power cords so will revisiting MC 0.5 later. Boy, TV picture quality is AMAZING so they do work.