Speaker Hum - Page 4

Simon - East London · #46 (**permalink**) 2nd February 2009 , 04:23 PM

Hi Pablo,

Just thought i would add this to your post, My mate had untold hum in his studio using his laptop and soundcard and he bought one of the ART DTI Dual Transformer / Isolator boxes this sorted his problem (After he spent a fortune on other possible solutions that didnt resolve this) -

http://www.dv247.com/invt/61016/

ecc83 · #47 (**permalink**) 2nd February 2009 , 04:56 PM

Hi Simon,

Yes the Art unit gets a very good rep' and I suppose pretty good value at a nifty.

I just galls the H out of me that we have very good tranny makers here but no one seems to be willing or able to put them in a posh tin and market them!
And S, mate, please read my diatribe about these being SIGNAL isolators only.

Dave.

Simon - East London · #48 (**permalink**) 2nd February 2009 , 05:21 PM

Quote:

Originally Posted by ecc83

Hi Simon,

Yes the Art unit gets a very good rep' and I suppose pretty good value at a nifty.

I just galls the H out of me that we have very good tranny makers here but no one seems to be willing or able to put them in a posh tin and market them!
And S, mate, please read my diatribe about these being SIGNAL isolators only.

Dave.

I totally agree ecc83, Will read your diatribe

Edit - Cant locate your diatribe about these being SIGNAL isolators only

ecc83 · #49 (**permalink**) 2nd February 2009 , 07:28 PM

There is it seems to me to be a certain amount of confusion concerning earth loops and "isolating" transformers ( often sloppily called DI boxes).

It is IMPERATIVE to realize that NO audio transformer is usually tested for or meant as a MAINS VOLTAGE ISOLATOR. That is to say, just because a box, like the one I am making, breaks an earth path between two bits of kit FOR AUDIO signals it does NOT mean that if one piece of gear became live the box would protect you. Good quality trannies, like OEP's probably would but THEY don't say so! (except for special products). The £3 a piece or so jobs I would not trust in America let alone in 240volt land!

So chaps(&ess's) Cardinal rule, everything must have its own mains earth and boxes just keep things quiet. That's ALL they do.
There you go!
Dave.

Gareth DV · #50 (**permalink**) 12th April 2009 , 11:06 PM

try one of these: works a treat on laptops.

http://www.dv247.com/invt/51928/

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#46 (permalink) 2nd February 2009 , 04:23 PM
Simon - East London Junior Member Join Date: Feb 2009 Posts: 6	Hi Pablo, Just thought i would add this to your post, My mate had untold hum in his studio using his laptop and soundcard and he bought one of the ART DTI Dual Transformer / Isolator boxes this sorted his problem (After he spent a fortune on other possible solutions that didnt resolve this) - http://www.dv247.com/invt/61016/
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#47 (permalink) 2nd February 2009 , 04:56 PM
ecc83 Super Member Join Date: Jul 2008 Posts: 400	Hi Simon, Yes the Art unit gets a very good rep' and I suppose pretty good value at a nifty. I just galls the H out of me that we have very good tranny makers here but no one seems to be willing or able to put them in a posh tin and market them! And S, mate, please read my diatribe about these being SIGNAL isolators only. Dave.
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#49 (permalink) 2nd February 2009 , 07:28 PM
ecc83 Super Member Join Date: Jul 2008 Posts: 400	There is it seems to me to be a certain amount of confusion concerning earth loops and "isolating" transformers ( often sloppily called DI boxes). It is IMPERATIVE to realize that NO audio transformer is usually tested for or meant as a MAINS VOLTAGE ISOLATOR. That is to say, just because a box, like the one I am making, breaks an earth path between two bits of kit FOR AUDIO signals it does NOT mean that if one piece of gear became live the box would protect you. Good quality trannies, like OEP's probably would but THEY don't say so! (except for special products). The £3 a piece or so jobs I would not trust in America let alone in 240volt land! So chaps(&ess's) Cardinal rule, everything must have its own mains earth and boxes just keep things quiet. That's ALL they do. There you go! Dave.
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#50 (permalink) 12th April 2009 , 11:06 PM
Gareth DV DV Staff Join Date: Jan 2009 Posts: 19	try one of these: works a treat on laptops. http://www.dv247.com/invt/51928/
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