update - still works well noticed complaints that others have problems with excessive noise. The problem is probably in the power supply, see the photo of what I have. This power supply is interchangeable with S Mani. I noticed that he improved Mani by making it more powerful. Used S Mani power supply on NA2 and improved the sound -YMMV. Currently alternating between Mani and NA2 on my main rig - great value for money even if you need a new power supply.
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