Audio, hi-fi and car audio - Dirty Digital [sic.]

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Dirty Digital [sic.]

Don Pearce wrote:

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.

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

Not on the stuff I look after.

I even re-wired balanced the feed to the desk from the bar's juke-box.

Graham

Dirty Digital [sic.]

John Williamson wrote:

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.

Sorry, my acerbic wit is probably unfamiliar to you.

I am actually moderately familiar with miking things. However I do like more
separation than say 3 metres from the bell of a horn gives you.

About 0.5m would suit me and still get some real sharp timbre from it.

Graham

Dirty Digital [sic.]

"Dave Plowman (News)" wrote:

Eeyore wrote:
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 ?

Well, take a piano. That has a sounding board. So sticking a mic close to
the strings alters the harmonic balance compared to a more distant one.

Same with string instruments which have some form of resonator.

But I'm asking YOU exactly. I did this for at least part of a living once.
I'm curious to hear your approach. In metres or feet and inches if you
prefer.

Graham

Dirty Digital [sic.]

"Dave Plowman (News)" wrote:

Phil Allison wrote:

The real world is FULL of poorly designed audio gear.

Your world obviously. Perhaps it's down to your trailer not being properly
screened.

NO.

Phil is as is usually the case very much correct. There's heaps of utter ****e
out there to this day, 'designed' by clots without the first clue about RF
susceptibility (or what 'ground' really is !).

Graham

Dirty Digital [sic.]

tony sayer wrote:

Eeyore scribeth thus
Phil Allison wrote:
"Don Pearce"

GSM phones need to be close to the victim equipment to be a problem, which
means they will be inside the building.

** Not true at all.

The GSM phone may be in the hands of a passer by just outside the studio
building or on a floor above or below where the studio is. Without
additional EMI shielding, some items of audio gear are affected ( ie buzz)
at ranges of 5 metres or more.

You know *someone* is about to receive a call in a sec when your equipment
'chirps' at you.

Well the only equipment that chirps in here is the landline phone

Classic.

and the old PC speakers.

CE marked ?

This isn't a problem as such its just poor design
with no considerations given to EMC..

Oh indeed. Such problems still exist, especially with 'esoteric' audio gear.

Graham

Dirty Digital [sic.]

In article , Phil Allison
scribeth thus

"tony sayer"
Phil Allison

I know several recentish studios supervised by my 'mate' that have had
whole
building EMC screens installed.

They really -necessary- these days?...

** When were the laws of physics repealed - Tony ?

Well to my knowledge they haven't as yet;)..

**Then shut your stupid ****ing gob - arsehole

GSM phones are the number one culprits for breaking into audio equipment
of
all kinds. You can ban them from the studio itself, but how do you keep
all
of them at a safe distance all of the time ?

GSM with its QAM mode is the most "apparent" interferer and is the most
likely,

** Blah blah blah .. quit the superfluous lecture - pal.

If you don't understand this its no real problem very few do..

Then there are VHF and UHF two way radios that travel around in commercial
and private vehicles - even the briefest injection of the signal from one
means having to redo something.

Yes "if" your equipment will "respond" to those signals

** Only takes one item in the whole set up or one item of muso's gear.

Well as I stated if their gear was of a time when no consideration was
given to EMC then yes it can happen, but as also stated the mode of
Modulation has changed over time which will make it less apparent..

However unless they put a mobile phone on it then it will be rather
difficult to make it happen. If there're going to do that then well,
wont it be audible over the mic's as well the one at the Proms last year
didn't 'arf please Slatkin he didn't find it in his score it seems...

In fact these days its very difficult to cause a problem with most all
modern equipment ....

Get real - ****wit.

This is real..like Dave Plowman stated on a day to day basis..

I'll save to having to reply to that..

**************ANOTHER ARSENINE POMMY ****WIT LIKE YOU ARSEHOLE!........

EMC screening is just as important as ever for a serious recording
facility.

Well..FWIW...

** It ain't worth a pinch of **** - you ****ant ******.

YOU have no ****ing idea how common it is to find audio gear that is RF
sensitive.

No I suppose not. A career that spanned TV transmitters up to 40 kW
transposers to 2 kW ReBroadcast receivers and demodulators , AM
Transmitters to sever hundred kW and FM to some 40 odd..

Audio equipment by Rupert Neve and Audix, Pye TvT, Work with the UK
radio communications agency radio communications investigation service,
the BBC, Cambridge university, cellular and communication radio sites
broadcast sites...

No I suppose not;!..

.............G' day....
--
Tony Sayer

Dirty Digital [sic.]

tony sayer wrote:

Eeyore scribeth thus
tony sayer wrote:
Eeyore scribeth thus

You're looking in the wrong places in the spectrum btw. Amateurs !

Where would you suggest then?..

The AUDIO frequency band maybe ? Talk about missing the bleeding obvious.

In my little description of making tests did I once mention a receiver ?

Graham..

I think you ought to look into what EMC means, there is Magnetic like
audible hum induction and RF interference the Elecro part.

And electrostatic would be ?

I trust that you see they are different. Otherwise why would EMC specs
state things like "in a field exceeding a 100 volts per metre"?..

Now that isn't a magnetic parameter in the AF band is it?..

So what ? We were talking about making electrically and acoustically quiet
studios.

Or did you mean that your friends make rooms that are screened against
magnetically induced fields?..

I haven't measured the exact relationship of the B, H and E fields but I do
know how to measure what will and what will not cause trouble in a recording
studio and FIX IT.

Something that the typical 'EMC expert' is an idiot about since he starts at
150kHz, produces a nice report that says it's OK, takes your money and then
the client finds they're stuffed.

Graham

Dirty Digital [sic.]

In article , Dave Plowman (News)
scribeth thus
In article ,
Phil Allison wrote:
GSM phones are the number one culprits for breaking into audio equipment
of all kinds. You can ban them from the studio itself, but how do you
keep all of them at a safe distance all of the time ?

It's a poorly designed piece of equipment that picks up a GSM phone unless
it is right on top of it. I'd say within 3 ft or so. Plenty is very much
better than this.

Indeed;) Even Dab receivers;))..
--
Tony Sayer

Dirty Digital [sic.]

tony sayer wrote:

Or did you mean that your friends make rooms that are screened against
magnetically induced fields?..

Is 2mm mild steel over say 10 m3 going to do that ?

Graham