With the kind of issues in your house, the best thing would be to try the AVR in someone else's house. That will confirm that the issue is not with the AVR.
Denon x4800h new humming noise
- Thread starter hardcore_gamer99
- Start date
I think normally we are using 0.75mm for wiring lights and thicker wire for power plugs. but i dont know in mm's i think 2.5 mm will be good. but lets wait for other FM's opinion.
hardcore_gamer99
Active Member
These 2 taken when inside case and outside of case what now
Attachments
I'm not able to view the numbers clearly but it looks like you have noise, peaking at around 120 Hz being fed or generated in both the channels. The noise may be in your electrical line. Best is to take the avr to some other house and check the same. This is not a pure 50 Hz tone.
Do you have a pure sine wave UPS. You can connect the AVR to the UPS without the UPS connected to the main line and check. Else it is best to test the AVR in someone else's house.
Do you have a pure sine wave UPS. You can connect the AVR to the UPS without the UPS connected to the main line and check. Else it is best to test the AVR in someone else's house.
If screenshot_20240904-212441_spectroid-jpg.86430 is from "inside" and screenshot_20240904-211854_spectroid-jpg.86431 is from "outside" then I interpret them as below. Hopefully, I've interpreted correctly, else someone who can do better at interpreting these can help.
There appears to be a -60dB peak at 103Hz when the AVR is kept outside the cabinet that intensifies to -44dB at 100Hz (??) when inside the cabinet. Whatever is causing the hum is present regardless of whether the AVR is inside or outside the cabinet. The cabinet just resonates with the sound and makes it more apparent.
As to what is causing the spurious signal, it's difficult to identify when you've got too many variables in play.
As suggested by all the FM's on this thread begin a process of elimination starting with checking the AVR at another persons place "where the electrical wiring is not all messed up".
Next get your wiring checked and fixed by an "actual" electrician.
If after this your AVR still presents the same problem go visit a couple of showrooms/locations and examine the same make and model of AVR to check whether all of them exhibit the same behavior as yours.
If they do, then your problem is not a problem but a feature of the AVR. Your choices will be to mitigate it to the extent possible or sell the AVR and move on. If they don't exhibit the same problem, take your AVR to the dealer/service center, recreate the problem you are experiencing and show proof of AVR behavior that you have noticed at other showrooms/locations vs your AVR.
If unable to do any/all of this in an organized, methodical manner, I guess you'll have to either live with this or yell and scream at Denon/the dealer and hope that they give you a replacement (this is a long shot and appears unlikely to work, given your experience with them so far).
hardcore_gamer99
Active Member
as avr is not that audible in the open. service guy will tell the same as they will test it in the open only i guess. also what do i exactly explain to an electrician?
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Well the Spectroid plot clearly shows that there is a spike regardless of where the AVR is kept. To establish that it's only your AVR that has the problem:
1. Take your AVR to another place with good wiring (nearby person's place / showroom).
2. Record a baseline Spectroid plot of the room without your AVR on (unplugged).
3. Record a Spectroid plot of the room with your AVR powered on.
4. Record Spectroid plots of another couple of X4800Hs in the same room.
The baseline plot from #2 helps you isolate out ambient noise to a certain extent. Compare the plots from #3 and #4 to see if your X4800H is the only one with a spike. Now you've conclusively established that your AVR is the problem.
Ideally you should do an apples to apples compare as described above, however the next best is to get a Spectroid plot of another X4800H kept in the open you can try and request on the Denon owners thread https://www.hifivision.com/threads/denon-owners-thread.50018/page-79 being very clear in what you are asking for. This as mentioned before will not be an exact comparison from the ambient noise perspective but will give you an idea whether other X4800H owners are experiencing the same.
Just for the heck of it I decided to Spectroid my AVR (Marantz) that is kept out in the open. The attached plot baseline.jpg (shows the ambient noise) and the AVR-on.jpg plot shows what Spectroid sees when the AVR is turned on. Ignoring the two HF spikes 4125Hz and 4125+Hz from a nearby squirrel there isn't any peak in the plot and the waveform is generally the same allowing for ambient noise.
To recreate your enclosure issue, what if you place your AVR in a plywood box that has one side open and see if you are able to recreate the issue. If the problem can be recreated with the box, then you have a portable test bed which you can take with the AVR to the dealer showroom/service center.
Attachments
See
www.audiosciencereview.com
www.audiosciencereview.com
for a couple of people who have reported the "hum" issue. There are yet other X4800H owners on that same thread who say their unit has no hum. Go figure.
However, they all appear to have clean power and/or have taken steps to ensure they have a clean power supply to rule that out as a cause.
Denon AVR-X4800H AVR Review
That verges on paranoia. I'm hearing what others are hearing so it's not like I'm the only one hearing it. Everyone that hears the 8002 talks about nuances, atmosphere, mids - even if you knew nothing about sound, you'd notice it. Verges on paranoia? May be you are getting a little...
www.audiosciencereview.com
Denon AVR-X4800H AVR Review
Doesn't it make a difference if the AVR is connected direct to outlet, to a line conditioner, or if a powerline ethernet adapter is part of the circuit? Unlikely, but if it us louder than normal due to excessive dc offset, then some line condtioners that can reduce dc offset may help...
www.audiosciencereview.com
for a couple of people who have reported the "hum" issue. There are yet other X4800H owners on that same thread who say their unit has no hum. Go figure.
However, they all appear to have clean power and/or have taken steps to ensure they have a clean power supply to rule that out as a cause.
hardcore_gamer99
Active Member
can you guide me to link tot amazon india for this ferromagnetic beads?
you can check - ferrite filter
Check your wire size, and check the proper filter on Amazon.
Electrician will know the issues with your house wiring. Just get a certified electrician & not a random joe.
Now I'm confused. You said that even in the open when you pull out the avr out of the cabinet there is noise. But above you are saying there is no noise. Is that photo of the avr in the service centre where the guy is checking with an oscilloscope. If yes and the osciloscope shows no noise, it means the avr doesn't have any issue. The issue then would be with your house or some equipment in the house that is pumping noise into the mains. Do you have a any motor which have brush inside (water pump, etc) which is running? A refrigerator whose motor is pumping that noise? Please eliminate external cause for this noise by switching off all equipments continuously running in the house (refrigerator, fan, tube lights, led lights/bulbs) and then check if the noise goes away.
I feel the same. Something is not right. stablizer/even aquarium air pumps/exhaust fan (old choke type tube or CFL bulb). You can turn everything off and plug in just the AVR and try.
hardcore_gamer99
Active Member
i have my separate room on first floor and have separate electricity wiring from first ground flloor. also turned off every appliance its same. today after 1 hour i will once check on ground floor as it has different wiring completely it will tell
hardcore_gamer99
Active Member
image above is for illustration only found on google map but the image from service centre actually
If it were an old AVR, then there would be some issues with the power supply or transformer, but in your case, the AVR is brand new. may be because of the house power. You are using AVR on the first floor, but the wires are connected to the ground floor. Try to look around if something is running.
The best way is to disconnect ground floor supply from MCB; and check
hardcore_gamer99
Active Member
no wire is connected to ground floor as said i have my separate service line
Then you check your AVR on the ground floor to know that your HT room has some issues.
- Is your place having a fluctuating voltage?
- Check your speaker cables as well.
- Make sure there is no lost contact on Speker terminals.
- Check your AVR at other places in your friends homes.
- Even if it shows vibration or humm, then contact the service centre or take it there.
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