Supernait 2 hum!

[nickrobotron]

New to the forum! I need start a thread to introduce myself, share a little about my system and how I’ve come to love Naim. But for now, the push for me to join the forum is that I have been having an issue that has been mostly solved by finding this thread:

Hum/buzz noise supernait 3

Greetings, I purchased the supernait 3 from another user. When turning on, there is not ahum/buzzing noise. As soon as I plug in the rca cable from my RME DAC to any input (stream, phono, etc.) the hum/buzzing starts. I have found the instructions here Supernait 3 humming when connected to AV Receiver - #15 by james_n Question: does it mean I could plug in one end to the Ground input in the back of the Supernait 3 and the other end to the power strip that I have the DAC and the supernait 3 …

I am running a little piece of speaker wire as recommended, but I was hoping someone could direct me to a more permanent part that plugs in. Does this exist? The language in the thread was hard for me to comprehend because I know nothing about electrical design, grounding, or whatever style of plug Naim uses. Thanks so much!

[robert_h]

It’s the dac:

Chord DAC and Naim Compatibility Issues?

Someone told me there could be a ground compatibility issue due to Naim’s use of a “floating ground.” I was told the smaller Chord products can have this issue when used with Naim. I get a pretty pronounced hum through both speakers when my Chordette Gem DAC is used (predecessor to the 2Qute). The hum gets louder as the volume increases. I’ve isolated the cables, tested other components, etc. It only happens when this DAC used. I have a Naim 152/155 XS set with Dynaudio Focus 160 bookshelv…

You’ll need to add a ground wire, are you using a mains block?
Check this specific post: Chord DAC and Naim Compatibility Issues? - #21 by Simon-in-Suffolk

[Simon-in-Suffolk]

Or as per the reference, use an Earth grounded source connected as well to your SuperNait.
Naim doesn’t use floating Earth… someone might have misled you. They use a system where one and only one connected source needs to be Earth grounded. If you have only one source then this must be Earth grounded. If you have two or more Earth grounded sources you will also likely get a hum.
Many Naim sources have a button on the rear that assigns then as Earth grounded (‘chassis’) or floating.

If your DAC source is the only source and it has a floating Earth, and hums, you will need to connect the mains Earth to the negative or return side to the RCA signal outputs of that DAC

[PeterJersey]

I have had the same issue with a Supernait 2 and an XS2 and resolved it by using a very high quality 5 volt power supply to the Chord DAC or with another DAC running it on a Lithium M/C battery.