[Scott Dorsey]

In article ,
John Doe wrote:
(Scott Dorsey) wrote:

I would have immediately fixed the thing (using capacitors on the
input as described by Mike) if it made sense to do that. It makes no
sense to me until I figure out what the problem is and why it is not
commonly discussed on the Internet. There are hundreds of millions
of gamers. They do not fix ground loops with transformers or
capacitors.

You are confusing us again. I am the one who suggested the shunt caps.
The shunt caps will reduce RF, they don't do anything about the ground
loop. Disconnecting pin 1 at the XLR connector will break the ground loop.

This IS very commonly discussed on the internet, people are CONSTANTLY
complaining about noise in situations like this. Companies like Edcor
and Lundahl specifically make transformer isolation boxes because so many
people have this problem.

Is it something wrong with the JBL LSR305 speakers? Like the inputs
not being compatible enough with the unbalanced output from the
soundcard? Not that I have to know.

No, there's something wrong with cheap soundcards, but that's how it goes.
You set the grounding up properly and deal with it.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[John Doe[_2_]]

(Scott Dorsey) wrote:

John Doe wrote:
(Scott Dorsey) wrote:

I would have immediately fixed the thing (using capacitors on the
input as described by Mike) if it made sense to do that. It makes
no sense to me until I figure out what the problem is and why it
is not commonly discussed on the Internet. There are hundreds of
millions of gamers. They do not fix ground loops with
transformers or capacitors.

You are confusing us again. I am the one who suggested the shunt
caps.

If us were paying attention, us would know us already confronted me
on that issue.

The shunt caps will reduce RF, they don't do anything about the
ground loop.

Well that's good, since it's definitely not a low-frequency
oscillation.

This IS very commonly discussed on the internet, people are
CONSTANTLY complaining about noise in situations like this.

Then you should have no trouble providing citations in which the
recommended solution to a PC sound problem is a "transformer
isolation box".

[Scott Dorsey]

John Doe wrote:

This IS very commonly discussed on the internet, people are
CONSTANTLY complaining about noise in situations like this.

Then you should have no trouble providing citations in which the
recommended solution to a PC sound problem is a "transformer
isolation box".

Well, here's one of the ones I mentioned:
http://www.lundahl.se/wp-content/upl...eets/SIB15.pdf

Although another (much fancier) one is:
http://www.radialeng.com/stagebugsb5.php

You will notice the descriptions on these all mention the ground loop issues
with computers. They are sold for solving these problems because they are
so common.

But you likely don't need this much isolation. Just lifting pin 1 will
likely fix your issue.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Mike Rivers[_2_]]

On 3/28/2018 10:10 AM, Scott Dorsey wrote:
But you likely don't need this much isolation. Just lifting pin 1 will
likely fix your issue.

Not if he doesn't understand how balanced connections work, and doesn't
know how to "lift pin 1." Remember, we're dealing with someone who
knows-it-all about computers and gaming.

Quoting John Watkinson: "Today's production equipment is IT based and
cannot be operated without a passing knowledge of computer, although it
seems that it can be operated without a passing knowledge of audio."

--

For a good time, call http://mikeriversaudio.wordpress.com

[Nil]

On 28 Mar 2018, Mike Rivers wrote in
rec.audio.pro:

Not if he doesn't understand how balanced connections work, and
doesn't know how to "lift pin 1." Remember, we're dealing with
someone who knows-it-all about computers and gaming.

Quoting John Watkinson: "Today's production equipment is IT based
and cannot be operated without a passing knowledge of computer,
although it seems that it can be operated without a passing
knowledge of audio."

This appears to be your first contact with this clown. He is all over
Usenet and always uses the same MO. He will not listen to you, will
argue with everything you say, and will then call you a troll and
publish your words on a public newsgroup without your permission.

Best to keep your distance and ignore it.