Kondo Overture PM2i - buzzing noise from transformer

Hi chayro, well Kondo sent me a photo with the iphone and "NIOSH SLM" app positioned on top of the transformer of their reference Overture amp showing 39.2 dB. I used the same app with same app settings and mine was even quieter at 32.6 dB. Now what does that mean..?

It means that Kondo is saying your buzzing is within their specifications.  If you bought it new, you should contact your dealer.  You should not have to put up with anything annoying in a product that is so expensive.  Very unfortunate.  

Yeah, you are right. I will try to trade in to the Overture to replace it with the Melius power amp. 

Overture audio has an excellent reputation. I have no doubt they will resolve your issues. Maybe they have another Kondo that doesn’t buzz. But I wouldn’t be shocked if you bring your amp into them and it doesn’t hum. Transformers can be sensitive to power lines, as you well know.  Let us know how it comes out. 

Well yeah, they were very helpful but in the end, their and also my conclusion was, that because the measured buzz/hum noise is within their specification and even lower than the buzz of their reference Overture in factory. The CEO himself took care of measuring and provided a photo of measured result. The buzz is supposed to be normal. For me the solution is to sell the amp or to but it in a sideboard with enough ventilation to reduce or eliminate buzz at listening position at very low volume. I must add, that my listening room is very quiet at 26 dB noise level. iPhone put directly on transformer resulted in 32,6 dB and at listening position there was measured only 1 dB higher noise level 🤷🏼‍♂️.