Denon x4800h new humming noise

[hardcore_gamer99]

Profx are v professional.when i bought 3600 denon from them there was problem with the audessy calibration which was getting stuck at 90%. When I informed sethurao from profx NXT day i was asked to get the unit to them.without a word they just replaced with the new unit with correction in the bill .

but in delhi they say its normal hum. i dont have any clue. If it is normal humming then why i did not hear it for the first 3 days

 

[hardcore_gamer99]

Okay. Thats was not clear to me earlier. When you say 'hum' that usually refers to a hum heard from the speaker.
A slight hum can be heard from the electrical transformers but only if you put your ear right next to it. Not otherwise.
To be honest though, it starting to feel Denon are playing the cheap card where they should not. Cause my old 3000 series AVR has no hum at all, even if you put your ear right next to the unit. Its dead silent.

this si the sound i finally made a video . kindly notice the sound when i press power button and turn it off in the end.

 

[Dwaipayan]

I believe as others pointed out, this is happening due to a mild vibration in the transformer core. When placed inside your cabinet, the cabinet itself is resonating and amplifying the sound to the point that you can hear it clearly, because it is made of wood and only supported at the edges. If you place the AVR at the floor, the vibration & sound is probably still there, but the solid concrete flooring and the lack of your cabinet's amplifying factor, it cannot be heard.

I have a static stabilizer which also developed a mild hum over time which was originally dead silent. So these things probably can happen over time.

One thing that you can try is placing something soft under the feet of your AVR when putting it inside the cabinet to dampen the vibration's effect and see if that helps reduce the hum. Another option might be using something very heavy (with a lot of mass) like a granite slab underneath the AVR, but please make sure that your cabinet can bear the combined weight.

 

[hardcore_gamer99]

I believe as others pointed out, this is happening due to a mild vibration in the transformer core. When placed inside your cabinet, the cabinet itself is resonating and amplifying the sound to the point that you can hear it clearly, because it is made of wood and only supported at the edges. If you place the AVR at the floor, the vibration & sound is probably still there, but the solid concrete flooring and the lack of your cabinet's amplifying factor, it cannot be heard.

I have a static stabilizer which also developed a mild hum over time which was originally dead silent. So these things probably can happen over time.

One thing that you can try is placing something soft under the feet of your AVR when putting it inside the cabinet to dampen the vibration's effect and see if that helps reduce the hum. Another option might be using something very heavy (with a lot of mass) like a granite slab underneath the AVR, but please make sure that your cabinet can bear the combined weight.

Develop over time yes but i opened seal of this avr 5 days ago

 

[Dwaipayan]

You can try to make a warranty claim, but not sure if it will get honoured. If the service folks cannot reproduce the hum to the level you are experiencing it, I doubt they will be willing to do anything.

 

[hardcore_gamer99]

You can try to make a warranty claim, but not sure if it will get honoured. If the service folks cannot reproduce the hum to the level you are experiencing it, I doubt they will be willing to do anything.

He says its normal hum but it is annoying me

 

[Phew]

You should ask them to fix it or replace it and if the humming is normal according to him then check out another unit and see if its there.

 

[hardcore_gamer99]

You should ask them to fix it or replace it and if the humming is normal according to him then check out another unit and see if its there.

i cant check any other model. Also it is very painful to go 70kms from home and they in the end say its normal!

 

[Phew]

i cant check any other model. Also it is very painful to go 70kms from home and they in the end say its normal!

They will not accept the fault, thats the beauty of it. You need to be firm with them and ask for a replacement or a fix.

 

[hardcore_gamer99]

They will not accept the fault, thats the beauty of it. You need to be firm with them and ask for a replacement or a fix.

i called them and even on phone they are not willing to take it as issue, so i guess i rest my case!

 

[hardcore_gamer99]

ok so here is the thing i made this video 5 months ago to make unboxing video and there is no sound at all of humming at all

 

[hifimaddy]

This is weird when i put on floor as u can see there is no humming and if i put back inside tv unit there is humming can u help? Wtf

This is because of poor earthing in your particular socket or at home. Try to connect your AVR to some other socket outside this room. Also, try to avoid placing it near ups/stabilisers. If your AVR still makes hum, try to disconnect your fridge, mixer, or all other electronics items in your home and just plug only your AVR. I hope this doest make your avr hum. ( in this case try to take a direct wiring from your electrical meter to avr room)

 

[hardcore_gamer99]

This is because of poor earthing in your particular socket or at home. Try to connect your AVR to some other socket outside this room. Also, try to avoid placing it near ups/stabilisers. If your AVR still makes hum, try to disconnect your fridge, mixer, or all other electronics items in your home and just plug only your AVR. I hope this doest make your avr hum. ( in this case try to take a direct wiring from your electrical meter to avr room)

i got these newly installed 5 sockets which are coming down from 1 modular socket could it be faulty

but in the end i tried my other room its still there

 

[jsmithe]

ok so here is the thing i made this video 5 months ago to make unboxing video and there is no sound at all of humming at all

In the video in post #51 the AVR appears to be on top of something and out in the open versus it is in the cabinet in your post #42 so not exactly an apples to apples comparison. As another FM indicated earlier, it appears that resonance comes into play when the AVR is placed in the cabinet whereas the resonant frequencies dissipate when the AVR is placed on the floor or out in the open.

Try a yoga mat or a thick rubber tile like this https://www.amazon.in/USI-UNIVERSAL-SUPERTUF-Rubber-WT10MM/dp/B096PBD864/ under the AVR when placing inside the cabinet to see if the resonance is dampened

 

[hardcore_gamer99]

In the video in post #51 the AVR appears to be on top of something and out in the open versus it is in the cabinet in your post #42 so not exactly an apples to apples comparison. As another FM indicated earlier, it appears that resonance comes into play when the AVR is placed in the cabinet whereas the resonant frequencies dissipate when the AVR is placed on the floor or out in the open.

Try a yoga mat or a thick rubber tile like this https://www.amazon.in/USI-UNIVERSAL-SUPERTUF-Rubber-WT10MM/dp/B096PBD864/ under the AVR when placing inside the cabinet to see if the resonance is dampened

Sir i installed these rubber pads on avr on its legs there is hum in beginning only now and goes away maybe tv unit cabinet has issues or amplyfing the sound vallah i am damned there is no sound now

 

[hifimaddy]

i got these newly installed 5 sockets which are coming down from 1 modular socket could it be faulty

but in the end i tried my other room its still there

Sharing your phase connection with your other house plugs would lead to hum. Even a mobile charger can make this happen. Very long ago, I used a normal plug for my AV and stereo use that made a lot of hum. But now that I have a separate room and direct wiring from my electrical box, this makes a lot of difference—no hum, no noise. (When you take a direct connection from the electrical box to AVR, use the bigger, thicker cable; don't use normal cables.)

 

[hardcore_gamer99]

In the video in post #51 the AVR appears to be on top of something and out in the open versus it is in the cabinet in your post #42 so not exactly an apples to apples comparison. As another FM indicated earlier, it appears that resonance comes into play when the AVR is placed in the cabinet whereas the resonant frequencies dissipate when the AVR is placed on the floor or out in the open.

Try a yoga mat or a thick rubber tile like this https://www.amazon.in/USI-UNIVERSAL-SUPERTUF-Rubber-WT10MM/dp/B096PBD864/ under the AVR when placing inside the cabinet to see if the resonance is dampened

https://amzn.in/d/cV02Meo
Bought this also

 

[jsmithe]

https://amzn.in/d/cV02Meo
Bought this also

It's the same thing, just a different color. Quite effective at cutting vibration.

 

[jsmithe]

Sir i installed these rubber pads on avr on its legs there is hum in beginning only now and goes away maybe tv unit cabinet has issues or amplyfing the sound vallah i am damned there is no sound now

Good. You've isolated the issue. You can then cancel your order for https://amzn.in/d/cV02Meo unless you have a sub and want to use it for that.

 

[hardcore_gamer99]

Good. You've isolated the issue. You can then cancel your order for https://amzn.in/d/cV02Meo unless you have a sub and want to use it for that.

Will buy sub as well