Bloody sub

[Bryceo]

I have humming noise from my sub


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[fuzz092888]

Ground loop?

 

[rojo]

Sounds like it doesn't know the words, but it's at least familiar with the tune.

Is the humming noise only when your system is on, or is it all the time? Do you use your sub's auto on feature? It could be a short, a ground loop, or your sub's amp going bad.

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[Speedskater]

Using a battery powered music source, does it still hum?

 

[Bryceo]

It's only when the system is on, it's got me stuffed, yeah my sub turns on auto, I tried manual still does it


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[slipperybidness]

It's only when the system is on, it's got me stuffed, yeah my sub turns on auto, I tried manual still does it


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New sub? or is it sub that has been in your system for a while that suddenly started doing this? If it's been in the system for a while, did you add anything else new to the system when the problem started. If not, it might be a filter cap going bad.

 

[Bryceo]

I added a second sub setup for music, in the same system and now it's humming until the second sub is unplugged


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[Adam]

Is the second sub plugged into a different outlet? If so, try using the same outlet/power strip as the rest of your system.

 

[Bryceo]

Subs are on there own outlet, one I unplug the second sub it stops doing it its got me stuffed


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[Bryceo]

I plugged the second sub in to the pre outs on the main sub if that helps, but as far as power goes there all on there own power point I have 4 where the system is


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[Adam]

Subs are on there own outlet, one I unplug the second sub it stops doing it its got me stuffed

I think you mean "stumped."

Try putting everything on the same outlet or power strip. The point of that is to get a common ground that will help if what you have is a ground loop.

 

[Bryceo]

Okay I'll give it a go now


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[Bryceo]

It didn't work


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[Adam]

It didn't work

If you haven't, try a different RCA cable. Sometimes the connectors come loose on those.

 

[Bryceo]

I try'd that -.- now I'm really running out of things to try re ran the rcas didn't work its gotta be the avr one unplugged from there it doesn't make the sound any more


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[Bryceo]

Try'd a different amp on my sub same thing!! This is really starting to piss me off


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[Bryceo]

Getting ready to throw it all out the door it's pissed me off way to much now


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[rojo]

To summarize, both subs plugged into the same outlet and one sub hums. Unplug the second sub and the first sub stops humming. Replacing the amp and the rca cables make no difference. Each sub individually plays without hum, but both together makes sub #1 hum, regardless of which sub is plugged into which outlet or amp channel. That about right?

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[Bryceo]

To summarize, both subs plugged into the same outlet and one sub hums. Unplug the second sub and the first sub stops humming. Replacing the amp and the rca cables make no difference. Each sub individually plays without hum, but both together makes sub #1 hum, regardless of which sub is plugged into which outlet or amp channel. That about right?

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yeah that's it

 

[agarwalro]

I plugged the second sub in to the pre outs on the main sub if that helps, but as far as power goes there all on there own power point I have 4 where the system is

As folks have mentioned before, you definitely have a 'Ground Loop' situation. The humming is happening because your devices have multiple paths to ground (4 power points). In one or more pairs of devices you have signal interference due to two parallel ground paths.

This is not uncommon and it can be easily resolved. It will take patience and a systematic approach to get to the root cause.

It takes two to tango. It's clear the new subwoofer is creating a ground loop situation. The question is, which other device is contributing to the loop?

Leave the new sub plugged in and humming. Now one by one disconnect other devices, starting with the older sub till the hum stops.

When you have found the other device, you know they both need to be on the same power point, even if it means simply moving them into the same surge strip.

Be warned, it could even be a TV or fridge in a different room, but, on the same electrical circuit. It could even be the broadband internet modem or set top box coax cable. Pretty much anything on the same circuit and having a ground path.

Getting ready to throw it all out the door it's pissed me off way to much now

Worst case scenario, nothing else is working in terms of finding the other device causing the loop, start looking for isolation transformers. Something like the Australian version of this, http://www.sweetwater.com/store/detail/HumX and put the new subwoofer on it.