Turn-on flutter noise in Denon X4800H due to inrush currents? Is it normal?

[PHD]

Hi

Following this post regarding my unlucky purchase of the Denon X4800H:

Denon X4800H random fluttering relay sound when turning on

Hi After only 2 weeks of usage, now, when I turn the X4800H on, the main PSU relay makes a loose spring or flutter noise randomly. In this video the spring sound only happens at the 2nd turn-on attempt...

www.audiosciencereview.com

The first unit had a random strange sound upon turning on and was sent to the service lab. After they communicated this with Denon they decided to replace the unit. The unit I got was from the same manufacturing date and unfortunately had the very same issue which can be heard here (first turn on with normal click noise followed by second with abnormal noise):

Meanwhile, the first unit was further tested at the local service lab and they told me that they did manage to identify the source of the noise, which was the main power transformer.

The root cause is vibrations from surging inrush currents which only occur when I turn the unit on while the AC waveforms are near their peak values. They said that while not all units are affected by this phenomenon, it is considered normal and harmless.

While the explanation does make sense, I can't understand how is this normal? Such an advanced AVR would have adequate inrush current limitations to avoid such a problem. Since only a subset if units are affected, I think I have the right to demand a replacement with an unaffected unit.

What do you think? Does this explanation make any sense? Would you keep the or return it?

@Doodski

Thanks

 

[Doodski]

While the explanation does make sense, I can't understand how is this normal? Such an advanced AVR would have adequate inrush current limitations to avoid such a problem. Since only a subset if units are affected, I think I have the right to demand a replacement with an unaffected unit.

What do you think? Does this explanation make any sense? Would you keep the or return it?

@Doodski

If me I would be frustrated like you seem to be. Demand a later serial number unit if that is how to avoid the noise. Unfortunately you bought a Denon AV receiver and there is little that compares to them from what I understand about AV receivers so it's not a simple matter of buying any manufacturers' unit. I am concerned about the relay fluttering as the inrush current issue manifests itself. After a decade of that action who knows what can be happening to it. My attitude/opinion regarding this sort of stuff is you where expensed for a working unit and you want to be made whole. Being made whole means having a unit that does not have blemishes nor issue with circuitry. I hate paying for services and goods that are not complete.