2. amps-preamps
  3. 125404-65769

What is DC offset on the AC power line?

I realize this question may be more appropriate in the miscellaneous section so please accept my apologies in advance. This may be somewhat amp related though, as in "don't use it with an amp".  

Can someone comment as to the pros/cons of a  DC offset suppression device, such as Emotiva CMX-2.

https://emotiva.com/products/accessories/cmx-2

I haven't seen this feature in other power strips and/or surge suppressors.

Thanks.


gdhal
gdhal's avatar
gdhal OP
1,641 posts
 
Thanks. The article is rather comprehensive, and while it explains a common cause could be an old household appliance, the article does not indicate what the disadvantage (if any) would be in using a DC offset filter if you didn't have an old appliance or otherwise need to. There must be some disadvantage in using this type of filter and that is what I'm looking to understand. If there is no disadvantage, I'm curious why the filter wouldn't be more widely available.
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wolf_garcia
6,794 posts
 
Both my SS (for remote speakers) and tube main amp are plugged into a PS Audio Humbuster III…the tube amp wasn't humming but there was an extra outlet there so I figured it couldn't hurt…so…the SS amp had that pesky transformer hum sometimes and now it doesn't, both amps are dead quiet. The end.
gdhal's avatar
gdhal OP
1,641 posts
 
the link u are providing is a forum thread from 2002 with many pages. I glanced over it. I do see one notation " What I'm trying to say is that the capacitors could limit the current and thus prevent the fuse to trip which may lead to dangerous situations. " 

jea48, here is an alternate url
http://emotiva.com/products/accessories/cmx-2

thanks for your continued feedback
jea48
4,767 posts
 

gdhal,

Lots of stuff inside there. I do not have any experience with the Emotiva device.

Are you experiencing a loud mechanical buzzing/humming sound coming from a torrid transformer in a piece of your audio equipment?

There is a member here on Agon that used to build DC blockers. I might be able to find his username if you need a blocker.

Edit:

Gbart is the Agon member's username. If interested you might try sending him a PM over the Agon message system.

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