Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:

Eeyore wrote:
The EMC regs require where relevant *magnetic* compatability.
Where relevant.

It's a specified test in EN55103-2.

" Electromagnetic compatibility. Product family standard for audio, video, audio-visual
and entertainment lighting control apparatus for professional use. Immunity "

http://standards.mackido.com/en/en-s...view_6542.html


Not seeing magnetic - just electromagnetic.

Oh FFS !

http://64.233.183.104/search?q=cache...7&client=opera

Magnetic Field Immunity 50Hz-10kHz
Test methods detailed in Annex A of EN55103-2


Graham

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:

Don Pearce wrote:

Do you know the most troublesome magnetic induction noise in a studio? It is
the ground loop.

Not in a PRO studio it isn't.


To stop that you have no choice but to break the loop -
you can screen 'til you are blue in the face and you won't stop the noise.

Amateur.

http://pin1problem.com/


I know all about the pin 1 problem; that isn't what I'm talking about.
You can get low level hum from line level ground loops - barely audible
but always *there* in the quiet bits.

In balanced circuits ?

Graham

Dirty Digital [sic.]
 

Don Pearce wrote:

In dynamic mics and tape heads? I've never encountered the slightest
sign of external magnetic pickup - you just plug them in and off they go.

Jeeez !

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:

Eeyore wrote:
The EMC regs require where relevant *magnetic* compatability.
Where relevant.
It's a specified test in EN55103-2.

" Electromagnetic compatibility. Product family standard for audio, video, audio-visual
and entertainment lighting control apparatus for professional use. Immunity "

http://standards.mackido.com/en/en-s...view_6542.html

Not seeing magnetic - just electromagnetic.

Oh FFS !

http://64.233.183.104/search?q=cache...7&client=opera

Magnetic Field Immunity 50Hz-10kHz
Test methods detailed in Annex A of EN55103-2


Graham


Right. So equipment is already specified as immune to magnetic fields.
No need to add shielding then.

d

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:

Do you know the most troublesome magnetic induction noise in a studio? It is
the ground loop.
Not in a PRO studio it isn't.


To stop that you have no choice but to break the loop -
you can screen 'til you are blue in the face and you won't stop the noise.
Amateur.

http://pin1problem.com/

I know all about the pin 1 problem; that isn't what I'm talking about.
You can get low level hum from line level ground loops - barely audible
but always *there* in the quiet bits.

In balanced circuits ?

Graham


Many line level circuits aren't balanced.

d

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:

The EMC regs require where relevant *magnetic* compatability.
Where relevant.
It's a specified test in EN55103-2.

" Electromagnetic compatibility. Product family standard for audio, video, audio-visual
and entertainment lighting control apparatus for professional use. Immunity "

http://standards.mackido.com/en/en-s...view_6542.html

Not seeing magnetic - just electromagnetic.

Oh FFS !

http://64.233.183.104/search?q=cache...7&client=opera

Magnetic Field Immunity 50Hz-10kHz
Test methods detailed in Annex A of EN55103-2

Right. So equipment is already specified as immune to magnetic fields.
No need to add shielding then.

Have you been taking drugs today or something ? Or did your brain not wake up with the rest of your body ?

Which part of "Test methods detailed in Annex A of EN55103-2" did you miss ?

Graham

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Don Pearce wrote:

Do you know the most troublesome magnetic induction noise in a studio? It is
the ground loop.
Not in a PRO studio it isn't.


To stop that you have no choice but to break the loop -
you can screen 'til you are blue in the face and you won't stop the noise.
Amateur.

http://pin1problem.com/

I know all about the pin 1 problem; that isn't what I'm talking about.
You can get low level hum from line level ground loops - barely audible
but always *there* in the quiet bits.

In balanced circuits ?

Many line level circuits aren't balanced.

Not in PRO use they aren't.

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
The EMC regs require where relevant *magnetic* compatability.
Where relevant.
It's a specified test in EN55103-2.

" Electromagnetic compatibility. Product family standard for audio, video, audio-visual
and entertainment lighting control apparatus for professional use. Immunity "

http://standards.mackido.com/en/en-s...view_6542.html
Not seeing magnetic - just electromagnetic.
Oh FFS !

http://64.233.183.104/search?q=cache...7&client=opera

Magnetic Field Immunity 50Hz-10kHz
Test methods detailed in Annex A of EN55103-2
Right. So equipment is already specified as immune to magnetic fields.
No need to add shielding then.

Have you been taking drugs today or something ? Or did your brain not wake up with the rest of your body ?

Which part of "Test methods detailed in Annex A of EN55103-2" did you miss ?

Graham


Nope, saw that.

d

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Don Pearce wrote:

Do you know the most troublesome magnetic induction noise in a studio? It is
the ground loop.
Not in a PRO studio it isn't.


To stop that you have no choice but to break the loop -
you can screen 'til you are blue in the face and you won't stop the noise.
Amateur.

http://pin1problem.com/

I know all about the pin 1 problem; that isn't what I'm talking about.
You can get low level hum from line level ground loops - barely audible
but always *there* in the quiet bits.
In balanced circuits ?
Many line level circuits aren't balanced.

Not in PRO use they aren't.

Graham


Never used a tip-send, ring-return cable on an outboard?

d

Dirty Digital [sic.]
 

Eeyore wrote:

"Dave Plowman (News)" wrote:

Eeyore wrote:
Close miking rarely captures the real sound of the instrument.
Define the real sound and why a mic with a clipping level of 145 dB
can't do it.
Nothing to do with clipping - it's just that the true sound of say a sax
doesn't come from the bell. Pianos not from the strings either. Strings
not from the actual strings. Etc, etc.

So where exactly ?

Go into a room where a piano/ string instrument/ woodwind instrument is
playing, & close your eyes. Use your ears to localise the sound. Pianos
make the sound mostly from the frame & sound board/ lid, with a smallish
direct contribution from the strings, most of the volume from acoustic
string instruments comes from the body & sound hole(s), with a small
amount of direct sound from the string itself. The tonal quality &
volume change with both distance from & position relative to the instrument.

That's in an anechoic chamber, add a real room, & it gets even more
complicated, with part of the "sound" of an instrumental performance
coming via the reflections from room surfaces. None of this can possibly
be captured by close micing. The ultimate case here would be a pipe
organ in a highly resonant room (Say, Liverpool cathedral), in which
case the room is an integral part of the sound of the organ. As the
pipes are spread round the building, how do you close mic that?
Unless you count the room as part of the organ, in which case you have
possibly the ultimate close micing arrangement.

Now, if you want to use a close microphone as an effect, then it can add
to the "sound", but is *not* the real sound of an acoustic instrument.

--
Tciao for Now!

John.