Chord Qutest/Super Nait 3 buzzing through speakers (and SN2 too)

I also had the ground hum problem when connecting my Chord Qutest to the RCA input of my Supernait 3. The problem was fixed very quickly by my dealer who provided me with a link cable connecting the outer casing of a din connector to the outer case of an RCA. This used an input but provided the grounding required for the RCA. Since then I have got a chord clearway RCA to DIN cable, this has offered an alternative and more elegant solution to the problem.

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How do you do that exactly? Since I use Qutest and external powersupply, i have also that annoying hum.

What would you suggest…i have now a DIN to RCA from my SN2 to Qutest. But there is a hum. What do I need to ground with what and with which type of cable?

Make sure the ground switch is set at default (chassis) on the ND5XS2 and keep the setup you have now with the Qutest connected to the SN2. Put your existing Lavender interconnect that came with the ND5XS2 back in (ND5XS2 DIN output to one of the DIN inputs on the SN2) as well.

Does the hum go ?

Unfortunately I sold the original DIN cable so I can not try this. Is there a picture anywhere of how a single cable from ground pin to mains socket would look like? Or would it help to turn off all boxes, and reconnect and plug in again?

Here you go. No need for the mains connection as this will achieve the same. You can just wrap the bare wire around the outer of the DIN socket to try this.

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Looks simple! Just a regular single and stripped wire? (Sorry…very very non technical here)

Yep. Just screw one end under the ground post and loop the other end around the metal outer of the DIN socket. See pics here -

Cheers, I will check for a copper wire. I also have 1 spare DIN plug perhaps I can have someting more permanent made with that then.

Did I f#+k up??

I unscrewed this plug, and now I can not screw it back in. Should I have squeezed the wire between this screw and plug? I can not feel anything in that hole to tighten it back any more. I am stressed out now.

Yes, I’m not sure how you unscrewed the whole thing ?

The knurled knob (at the bottom of your picture) is what you needed to unscrew. There should be an internal insulating washer, ring terminal and nut inside which looks to have come off.

I suggest getting your dealer to open up the SN3 and put it back on.

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Now I feel dumb. But thanks, i think you are right. I saw a picture here without that knurled knob and screw so i thought both needed to come off. I provisionally managed to attach the wire. Hum is gone, now it is only a soft buzz. But I will go to the dealer for repair and a permanent solution. Not my day today

It should be a nice quick job for the dealer to sort out putting the ground post back and as you say, they can then make you up a more permanent solution for the ground wire :+1:


Hi, new to the forum as I only just received my new SN3 with Chord M Scaler and TT2 combination. They sounded amazing at the dealer, but I was hugely disappointed last night when I’d removed my old Linn system, cabled in all the above, turned it on, and buzzing came out of the speakers.

I tried it all. Moving the TT2 1 metre from the SN3. No joy.

Swap the M Scaler and TT2 PSU’s. Still there. Unplug the RCA cables to SN3. Solved, but useless.

Disconnect the TT2 from its PSU, also resolved the buzz. Interestingly just by bringing the power connector close to the TT2 the SN3 would buzz through the speakers. The TT2 didn’t even need to be plugged in! At this stage the TT2 was going back to the dealer.

I then hooked up the TT2 to my old Linn. Nothing but silence.

I went to bed confused.

This morning I Googled, and found this thread. I stripped an old cable and using the suggestions above, threaded it around a DIN port and the Ground connector. The Supernait buzz is no more.

I just wanted to thank all the contributors on this forum for their excellent support!

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earth loop - well documented with some chord gear, do a search on here and there will be a useful picture of a small length of wire of wire around the outside of one of the spare din sockets to earthing post - ive not got it too hand but its well known fix


What a faff, when you could have solved the problem so easily by upgrading the TT2 to Dave :crazy_face:


So, I got a Chord Hugo TT2 today to replace my Chord Qutest. Connected it to my SN3 and BUZZZZ.

But I never had any buzzzing from the Qutest - but I did use an SBooster power supply with the Qutest and the SBooster has a 3-prong mains plug (or as we’d call it here in the US a power cord). The TT2 has a 2-prong 19v power supply and the designer Rob Watts warns against using an alternative power supply or even adding a grounded power cord. The manual even says use of an alternative power supply voids the warranty.

I tried moving this that and the other thing. I replaced the RCA/RCA cable with a Naim RCA/DIN cable. Nothing stopped the buzzing.

Before panicking I did a search and found this thread. GREAT! Thank you all. Buzzing is now gone. I put the bare ground wire around the streaming DIN input and put the Din cable on to hold it in place. No Buzzing.

By the way, the Chord Hugo TT2 sounds most excellent.

Thanks again!

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Good to see someone with a similar setup to me. Glad this was also useful advice for you.
As a fellow SN3 user, I’d be interested in where you have the balance knob positioned?
If I position it dead centre, so 12:00, it is strongly driving the left speaker. Playing a mono track and using a combination of listening, plus a sound meter app, I settled on it in the 1:30 position. Is this normal?

Coming back to the SN3 & TT2 combination, the imaging, detail and FUN from these two really is special.

Hugo2 / SN3 owner here, so similar to Qutest.
Do you feel there is much of an upgrade to the TT2?

mine was the same so i just pulled it off gently and moved it one spline on the shaft…