I’m hoping to lean on advice from some more experienced folk.
I recently switched from an old Superuniti to NDX2, NAC202, NAP200DR. No outboard power supplies just yet.
The improvement in SQ is obviously quite clear but there’s a lot of extra noise, that I didn’t experience with the SU.
Most noticeable is a constant, quite audible fuzz from the speakers, which is degrading the experience.
More concerning, the NAP200 itself has a constant and loud buzz.
I don’t yet have a dedicated ring for the system but I’ve experimented by flipping every other breaker in the house and unplugging everything from the ring that powers the system. Plugged directly to a wall socket, in a relatively new house with good electrics, whether it’s just the NAP connected, or the NAP and NDX2 connected, the buzz directly from the box and fuzz from the speakers remains. (NAC is powered by NAP).
Has anyone else experienced this? I can only imagine the NAP has a problem. It’s all under warranty.
Any other fault finding exercises I can try? And/or any other relevant advice would be much appreciated.
The buzz from the NAP sounds like transformer hum. The toroidal transformers Naim use do tend to show this tendency particularly if your mains supply is not perfect, though it does seem to vary from example to example. A dedicated supply might solve this issue, but it’s not guaranteed. Some folk have found a DC blocker an effective cure, there’s lots of threads on this, so might be worth doing a search.
However, the audible “fuzz” from the speakers doesn’t sound right at all. A slight hiss when your ears are close to the speakers is normal, but it shouldn’t degrade the listening experience. I would agree that contacting your dealer to discuss the issue is a sensible move.