Annoying Hum - Computers and Technology

Welcome Guest

Search | Active Topics | Members | Log In | Register

4four » Main » Computers and Technology » Annoying Hum

Annoying Hum

Options

Previous Topic · Next Topic

mobsta

Posted: Tuesday, January 19, 2010 3:27:36 PM

Rank: Member
Groups: Member

Joined: 9/27/2005
Posts: 199

Ok, I've tried a ground loop isolator and un-plugged & replugged everything in again. Still this thing won't go away.

So I have now unplugged everything except my KRK monitors & Sub, and the hum is still apparent. Could the noise be from the mains ring itself and if so, how do i get rid of it?

Anybody have any solutions?

Chars.

Leuven

Posted: Saturday, January 23, 2010 6:09:24 AM

Rank: Member
Groups: Member

Joined: 8/25/2008
Posts: 143
Location: Belgium

Give us a spec of all you're using (mainly the outboard kit) and I'll try and identify your problem?

qUE

Posted: Monday, January 25, 2010 12:46:12 PM

Rank: Member
Groups: Member

Joined: 12/17/2009
Posts: 38
Location: Bristol, UK

mobsta wrote:

Possible bad earth on your mains supply. If the amp does some current dumping on the PSU (which is common to level off the output) then no amount of grounding the audio input would remove the hum. Maybe worth investing in an earth tester or get someone who's an electrician by trade to check it.

invertedlightsource.com - Inverted Light Source recordings

3rdevent.net - 3rd Event Technologies

mobsta

Posted: Saturday, March 27, 2010 5:58:46 AM

Rank: Member
Groups: Member

Joined: 9/27/2005
Posts: 199

Finally found the source of the noise.... a combination of interference from dimmer switches and electrical underfloor heating. The xlr speaker cables running along the floor are picking up and amplifying the noise from the underfloor heating. I'll change the dimmer switches to the normal on/off type but what a fucking carry on. I thought xlr was a shielded cable?

louthy

Posted: Monday, March 29, 2010 5:44:22 PM

Rank: Administration
Groups: Administration

Joined: 1/6/2006
Posts: 9,350

mobsta wrote:

It should, but I think physically you could still get problems if the electromagnetic field coming from the interferance source is at the right frequency. The probability that an electromagnetic wave will pass through a material will change depending on its frequency, and there will be certain frequencies which pass through more of the time. It's also not always the case that thicker shielding is better, it's all to do with the wavelength of the electromagnetic radiation. Also, if there are any holes in the shield then that will be enough for the radiation to get in and cause hum.

A good example of this is the door on a microwave oven. Microwaves are electromagnetic radiation, as is light, as is the electricity going down your speaker cables. The only difference is the wavelengths. Obviously you can see through the door of a microwave oven, so light radiation is passing through, but the microwaves don't.

My theory anyway, could be talking bollocks of course Wink

www.4four.org
www.paullouth.com
www.vinylcarvers.com

The bitterness of poor quality remains long after the sweetness of low prices

Users browsing this topic

Guest

4four » Main » Computers and Technology » Annoying Hum

Forum Jump

You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.