I was going to say the same thing regarding the serial number!
OP appears to live in the EU where they only have the AVC-X4800H and not the AVR-X4800H! I think the biggest difference for them is the lack of a radio!
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Denon X4800H random fluttering relay sound when turning on
- Thread starter PHD
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OP appears to live in the EU where they only have the AVC-X4800H and not the AVR-X4800H! I think the biggest difference for them is the lack of a radio!
dougi
Addicted to Fun and Learning
I think the models are named AVC in those markets where a radio tuner is not included. (Like Australia in my case). AVR for markets where one is, like USA.
OP
PHD
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Denon support seems to be ignoring all of my support tickets... My issue is still unresolved. I got a replacement AVR with the exact same problem and even with a new one (hum noise during Audyssey measuements..) and I'm unable to get any response from Denon...
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PHD
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After escalating the issue to Denon's management, I got their technical team to respond. The noise is caused by the surrounding plates near the main transformer. When the transformer is energized, the strong magnetic field is formed due to an inrush current surge which pulls the plate causing it to vibrate shortly.
The phenomenon is harmless and should have no long term impact according to Denon support.
The problem is rare and only affects a subset of devices manufactured in 2022. Their suggestion is to either get the unit serviced by enforcing the plates and adding some foamy insulation which can be done at the local service lab, or, work with the store to have it replaced since the problem was discovered out of the box.
I'm now waiting for the store owner to decide (no return policy here. neither no replacement once the product was taken out of the store). The local service center are also involved and trying to find a solution.
The phenomenon is harmless and should have no long term impact according to Denon support.
The problem is rare and only affects a subset of devices manufactured in 2022. Their suggestion is to either get the unit serviced by enforcing the plates and adding some foamy insulation which can be done at the local service lab, or, work with the store to have it replaced since the problem was discovered out of the box.
I'm now waiting for the store owner to decide (no return policy here. neither no replacement once the product was taken out of the store). The local service center are also involved and trying to find a solution.
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