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Loud hum when HGS 10 is turned on

I have had a low level hum for a while on my HGS 10 but tollerated it. Now every time its turned on, I get this very loud noise which eventually subsides and then the lower level hum remains. It still produces good tight bass.
The loud noises and hum is still the same with open or grounded inputs or with 2 wire AC power supply (no ground wire).

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Re: loud hum when HGS 10 is turned on - Velodyne Speakers & Subwoofers

Bad amp

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Posted on Dec 20, 2009

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Loud buzz in sub woofer, soundbar sounds fine

How to Stop a Subwoofer Hum - HowStuffWorks
Would you like to learn how to stop your subwoofer from making a consistent low-frequent hum or buzz? Read this article to learn how to stop a subwoofer hum.

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Hum usually indicates a power supply problem. If it has an internal supply you will need someone to check it's producing clean DC. Alternatively if you do open it (beware risk of shock!!) initially visually check condition of /replace any bulging electrolytic capacitors.

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I have a pair of JM lab Electra 905 speakers, running through a DNM amp and power amps. When powered up, the left speaker makes a very loud humming noise. This has happened recently. I haven't changed...

Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.

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Speaker makes a rather loud humming noise.

You can go buy a audioquest SUB-X subwoofer cable with a additional ground wire on it an connect the ground cable to the ground slot of the receiver an the other end to a screw on the sub or into one of the high output terminals on the woofer if it has them an this will take that humming sound right away but the cable is around $90

Mar 28, 2010 | Velodyne HGS-10 Subwoofer

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Loud hHum from Subwoofer

Sounds like the hum might be mains hum caused by the failure of the power supply capacitor(s) in the sub. It/they will be the largest on the pc board. You will find all the details (needed to replace it) on them. If you find more than one replace both.

Dec 10, 2009 | Speakers & Subwoofers

1 Answer

Humming sound when on/off

humming sound when on is usual if the volume is turned up.
humming sound the same when on or off could be transformer plates fluxing.
if loud recommend replacement of power supply.
if ok then recommend unplugging the device after use.

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15 inch velodyne subwoofer making a loud popping sound

If you have changed the signal source, then these may not be the problem at all, it may be that you have the sub output set to low on your processor.

This may be one of these problems.

It could be the "auto on" circuit.
If you change the switch on the back of the unit to always on does it still do this? if not then it is the auto on circuit that is the problem.

The driver mounted servo unit is starting to fail.

A cap in the amplifier input section may be going bad.

You nwill need to contact Velodyne for repair of the unit.

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A few more questions-
Does the sub hum without anything plugged into it except for power? If it makes a real loud hum almost a squeal then I think the rca cable between the receiver and the sub is dead shorted and needs to be replaced. If it's more of a low level hum, then it's a ground hum caused by many things, ie........the receiver and the sub being on different power circuits in the house.......sometimes diconnecting the cable tv feed as it enters the room while the sub is connected and humming to see if it stops........the easy fix sometimes is using a 3 to 2 prong ac adapter but lifting the ground on such a powerful amp could be a fire hazard.

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Sunfire Mk II hum (different from greekboy post)

I had this issue a few years ago and the power cable from one of the inner terminals had come loose. It was still touching but whenever the sub would really pound it would jump off the connection and then reconnect causing it to hum. It was the most annoying thing ever so I finally pulled off the amp plate (super easy) and you could clearly see the loose wire. I had to use a good soldering iron to put it back on since it's a pretty fat wire. If you're not under warranty anymore then pop the back off and see if that's the issue.


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