I am aware that this topic came up before. Unfortunately I couldn’t find a solution so far.
Recently I bought a preowned Naim combination consisting of. NAC202, NAP200, HiCap, NAPSC clone. All components from around 2009 in perfect optical condition.
Amplifier combo plays together with ND5XS2 and B&W 702S2.
The combo plays very well, but without signal there is an audible humming coming from all transistor containing units, but the ND5.
Secondly after starting up the system, again without signal, I get a hissing from the tweeters, which is independent from the output volume on the preamp.
To tackle the humming, I already tested a DC blocker from HMS to no avail.
What I didn’t test is to run the system without the upgrades, because I don’t have the link plug.
As far as I know this link plug bridges 2 of the 4 contacts. Can anyone tell me which contacts, so I could test with a wire?
Has anyone had the same issue?
What is the source of the hissing NAC or NAP?
Any tipps what else to test or how to solve the issues?
Hissing on Naim kit whilst idle is normal. It shouldn’t be audible from your listening seat.
If you have been supplied with both link plugs on the 202 you could remove the HiCap and whatever you are using for the NAPSC. The 202 would then be powered from the 200 and this would eliminate any external supplies.
My point of course following on from noting that the OP’s speakers being more sensitive than most and so would more likely to be audible at the listening seat, was that would be all the more likely if they sit closer than most.