Denon x4800h new humming noise
- Thread starter hardcore_gamer99
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hardcore_gamer99
Active Member
whatever the sound is it only comes from receiver not from tv 4k player or speakerIf you remove speaker cables, how do you know the humming or anything?
hardcore_gamer99
Active Member
This today i recorded with rubberpads inside tv case
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This is again 100 Hz noise. You just need to take the avr and speaker to someone elses house and eliminate if the issue is with the AVR or your power supply. If the issue is with AVR, it will show up in service centre's oscilliscope also and the company then will have to honour warranty.
Without checking in some other house, you are just wasting your time.
hardcore_gamer99
Active Member
right, can you tell how will this oscilliscope detect? If they will check with this device and IF THIS DEVICE CAN ACNTUALLY DETECT ISSUES IN TRANSFORMER, I CAN CANS URELY TAKE IT THEN TO SERVICE CENTRE WITHOUT WASTING TIME. I AM WORRIED THAT THEY WONT EVEN TOUCH IT AND WILL SAY ITS NORMAL SOUND, thats why i am not going
1. Transformer is not an active device. It cannot convert 50 Hz to 100 Hz. Your main supply is at 50 Hz. The worst a transformer can do is produce noise at 50 Hz. Your problem is not a transformer issue. Transformer just decrease (step down) or increases the voltage. It cannot increase or decrease the frequency. Also transformer output undergoes ac-dc conversion and then filtering using capacitors. The capacitors remove the ac ripple noise. Let us say your capacitors have gone bad. In that case you will get 50 Hz noise and not 100 Hz.
2. 100 Hz is not normal sound. Your main supply is at 50 Hz. If there is any problem with DC rectification, shielding, etc then the 50 Hz mains supply will manifest as 50 Hz noise and not 100 Hz. Remember that 100 Hz is exactly 2x of 50. This looks like some motor, refrigerator running in the same building producing the noise.
3. Without any input connected you should be getting almost 0 volts on the output. Oscilliscope measures the waveform. For DC it will be a straight line. For 50 Hz it will show a sine wave of 50 Hz. If it shows 100 Hz output without any input it means that some component in the AVR is oscillating and generating a 100 Hz tone. If your AVR is fine, It will show nothing. Worst case it will show a sine wave of 50 Hz indicating mains leakage. 50 Hz noise is like a hum. 100 Hz noise is like more than a hum, something less than a motorboat sound.
4. If your AVR has no issue then there will be absolute no sound with any input connected, provided the noise is not from the mains and noise is not being injected from external source
hardcore_gamer99
Active Member
Thank you for this comprehensive detail. No its not motorboat sound its hum only. I think i will visit service centre but have health issues will vvisit hospital 1st
Health is more important than some silly noise. Take care of that first.
hardcore_gamer99
Active Member
Its too complicated and sometimes health cant come back as time CANT. thts why i am hesistant to go any service centre or out. As i have health issues
rwnano
Well-Known Member
Anyone else feel that newer AVR amplifiers are worse quality and build wise than older ones? Planned obsolescence what?
hardcore_gamer99
Active Member
Without any input connected you should be getting almost 0 volts on the output how do i test this?
Simple. There will not be any sound from the speakers. They will be dead silent
hardcore_gamer99
Active Member
I checked denon without anything connected to its back. Hum was still there
But you are checking it in your own house. Check it somewhere else. If the hum is there then there will be no doubt that your AVR is defective.
hardcore_gamer99
Active Member
should i select stereo mode if i play songs from original cd and also while playing movies stereo/dts-hd/dts hd+surround/ dts+virtual x/dts+neutral x how these modes differ in denon x4800h if i have only front left right speakers only
That is fine but not necessary. You can also connect the speaker one by one to front surround, rear surround etc and see if the noise is coming from all channels. The avr also converts stereo into surround if you select any of the surround mode. So it doesn't matter if you have just two speakers. Even one speaker will do, but it will take you time to switch off, connect the speaker to the speaker terminal one by one and then switch on.
I think for Land R in general sterio only. And try all modes to explore.
And for your search for center channel many are saying about timbermatch means same brand same series but diferent brands like svs ulta is also very good. Include indiq audio also i yiur list as you can check with amit from indiq audio and customize the speaker .
hardcore_gamer99
Active Member
noise is another issue . there is still noise if nothing connected to avr on back. i was talking abt the best sound quality thst y asked
The World Hum Map and Database Project - Dr Glen MacPherson
We are tracking down the cause of worldwide anomolous low-frequency noise complaints. The current theory is that the Hum is an internally generated perception of sound (as is tinnitus), and not an actual sound.
www.thehum.info
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