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My avr 510 has low level speaker hum in all modes

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Makes a loud humming noise when plugged in, even when it is not conncted t the AVR

Humming noise could be an indicator of bad capacitors in the amplifier. You can take the amp out, pull the cover off, and look at the capacitors. If they appear to be swollen at the top, with some brown ooze coming out of them, then they need to be replaced. You can actually do this yourself from radio shack parts, just get the proper sized voltage and uf capacitors, desolder the old ones, and solder the new ones back in.

I have to do this every 5 years, or so, to my old MTX home sub amp.

Jul 10, 2012 | Acoustic Research HD510 System

1 Answer

One side louder than other in all modes.

Hi there.
Have you tried to connect the left speaker on the right wire.
If that's ok check the balance setting on the unit or volume on each speaker.

Nov 10, 2009 | Harman Kardon AVR 510 Receiver

1 Answer

Nakamichi SS-5 humming noise at stand-by nmode

Nakamichi service center in New Delhi. call +91 9871371720

Jun 26, 2009 | Nakamichi SoundSpace 5 Shelf System

1 Answer

Humming sound(speakers)when HK AVR 3550 is powered up?

yea try use in a monster power strip it clears al of that up it is picking up noise from all the wires

Apr 02, 2009 | Harman Kardon HK 3550 Receiver

2 Answers

Humming sound (speakers)when HK AVR is powered up.

In my case the buzz was only on front speakers. There are 3 capasitors (100uF/25V) very close to the cooling ribs of 3 regulators in the power supply. In my case the C922 was bad.

Apr 02, 2009 | Harman Kardon AVR 500 Receiver

1 Answer

Intermittent low hum in TV/cbl mode works fine in tunner DVD mod

I switched out of the audio-out cables from the cable box to the audio in at the Denon receiver and went with a coaxial cable connection. That switch got rid of the hum. I don't understand why the initial connection produced the hum, but the unit is working fine now.

Jan 28, 2009 | Denon AVR-1908

1 Answer

Humming sound in receiver...being transmitted to ceiling spaekers

Low humming sound is invariably the ripple of the AC mains supply breaking through.
Sometimes it is radiated from nearby wiring, sometimes it is caused by a hum loop and sometimes it is an indication the capacitors in the power supply are failing.

Feb 27, 2018 | Denon AVR-484 5.1 Channels Receiver

3 Answers

Denon AVR-1508 Receiver problems - cuts off and goes into protect mode

Usually when the unit runs for a while before shutting down there are two possibilities:

1) There is a small amount of DC current present that effectively heats up the speaker coils enough to cause a temporary short circuit that kicks in the protect circuit.
2) The output transistors or bias transistors are sensitive to heat and breaking down again causing the protect circuit to kick in.

A few experiments to try:

1) Does the time to shutdown change depending upon the volume level?
2) Is there any background noise coming from the speakers? Listen to a blank tape for example. Is there a hum or any other noise that you would not normally expect?
3) If you have a DC voltmeter, check for any voltage between the speaker lines.

Update this and we'll try to narrow this down.


Aug 18, 2008 | Audio Players & Recorders

2 Answers

Humming noise in Harmon Kardon AVR 110

on what cd dvd ? cheak cable 1st rca swap out

Jan 29, 2008 | Audio Players & Recorders

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