Re: [Sursound] Ambisonics recording of LOUD night club or venue?

2015-06-06 Thread Andy Furniss

Eric Carmichel wrote:

Greetings Everyone,I haven't posted in ages--a move to Silicon Valley
over a year ago has occupied my time.Does anybody have a Soundfield
recording of a loud nightclub or live music venue? I mean really LOUD
electronic dance or rock music. I understand this isn't something
you'd normally take a high-end mic to, but I need an accurate
representation of the atmosphere. I have live recordings taken from
feeds, but these aren't representative of what the "sound" is really
like. A binaural or monaural recording (with quality mics) would
help, too, but marginal quality recordings made with a Smartphone
won't work (otherwise I'd go to YouTube and find tons of $%#@).I
checked uploaded recordings linked to the ambisonic net site: Very
cool stuff, but not what I need for a particular study.Best
regards,Eric


http://www.core-sound.com/sampler.php

Has some Binaural one of which claims to be very loud - real head though.
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Re: [Sursound] Sursound Digest, Vol 83, Issue 2

2015-06-06 Thread Eric Carmichel
Thanks, Sampo and Andy,I didn't think to check Core Sound's site. (Side: 
coincidentally, I just ordered a Jecklin disk from them.) I wonder if my head 
is shaped like Len M's -- the sampled recordings could be a real binaural 
treat! Both the deafeningly loud club and motorcycles ought to work. Thanks 
again for suggesting.Sampo, I agree. I often work with MEMS mics. SNR getting 
better, but the overall response is so affected by the net acoustic path 
(air-mass loading) that there's always a peak in response. Low frequency 
generally rolls off below 100 Hz without electric filtering, though this can be 
set by manufacturer (f3 = 5 Hz entirely possible, but low freq energy saturates 
system). Regardless of uniform response or SNR, sound quality of microacoustic 
mics is inferior to good studio mics.Best regards,Eric
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 To: sursound@music.vt.edu 
 Sent: Saturday, June 6, 2015 9:00 AM
 Subject: Sursound Digest, Vol 83, Issue 2
   
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Today's Topics:

  1. Ambisonics recording of LOUD night club or venue? (Eric Carmichel)
  2. Re: Ambisonics recording of LOUD night club or venue?
      (Sampo Syreeni)
  3. Re: Ambisonics recording of LOUD night club or venue?
      (Andy Furniss)


--

Message: 1
Date: Sat, 6 Jun 2015 00:05:19 + (UTC)
From: Eric Carmichel 
To: "sursound@music.vt.edu" 
Subject: [Sursound] Ambisonics recording of LOUD night club or venue?
Message-ID:
    <1261780876.6102999.1433549119381.javamail.ya...@mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Greetings Everyone,I haven't posted in ages--a move to Silicon Valley over a 
year ago has occupied my time.Does anybody have a Soundfield recording of a 
loud nightclub or live music venue? I mean really LOUD electronic dance or rock 
music. I understand this isn't something you'd normally take a high-end mic to, 
but I need an accurate representation of the atmosphere. I have live recordings 
taken from feeds, but these aren't representative of what the "sound" is really 
like. A binaural or monaural recording (with quality mics) would help, too, but 
marginal quality recordings made with a Smartphone won't work (otherwise I'd go 
to YouTube and find tons of $%#@).I checked uploaded recordings linked to the 
ambisonic net site: Very cool stuff, but not what I need for a particular 
study.Best regards,Eric
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Message: 2
Date: Sat, 6 Jun 2015 04:01:26 +0300 (EEST)
From: Sampo Syreeni 
To: Eric Carmichel ,  Surround Sound discussion
    group 
Subject: Re: [Sursound] Ambisonics recording of LOUD night club or
    venue?
Message-ID: 
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed

On 2015-06-06, Eric Carmichel wrote:

> Does anybody have a Soundfield recording of a loud nightclub or live 
> music venue? I mean really LOUD electronic dance or rock music. I 
> understand this isn't something you'd normally take a high-end mic to, 
> but I need an accurate representation of the atmosphere.

I don't have one. But from what I understand, SoundFields, especially of 
the classical kind, can take one hell of a beating without even 
distortin too much. I seem to remember you can take a Mark V into an 
environment close to 130dB(A), while still being so-and-so on the safe 
side.

With the newer ones, your mileage may vary. But not too much even there. 
All of the miniaturized mics are of course shit, as they always were.
-- 
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2


--

Message: 3
Date: Sat, 06 Jun 2015 09:51:49 +0100
From: A

Re: [Sursound] Ambisonics recording of LOUD night club or venue?

2015-06-06 Thread Hugh Pyle
I have a few loud bands.  How about this one in B-format?  Small venue with
rowdy people.
https://www.youtube.com/watch?v=Bqxd5KnN8ns

You can also find quite a few Soundfield and TetraMic sources on
https://archive.org/details/etree, but they're generally only published in
stereo downmix, and you'd have to contact the recordists.

Hugh


On Fri, Jun 5, 2015 at 8:05 PM, Eric Carmichel  wrote:

> Greetings Everyone,I haven't posted in ages--a move to Silicon Valley over
> a year ago has occupied my time.Does anybody have a Soundfield recording of
> a loud nightclub or live music venue? I mean really LOUD electronic dance
> or rock music. I understand this isn't something you'd normally take a
> high-end mic to, but I need an accurate representation of the atmosphere. I
> have live recordings taken from feeds, but these aren't representative of
> what the "sound" is really like. A binaural or monaural recording (with
> quality mics) would help, too, but marginal quality recordings made with a
> Smartphone won't work (otherwise I'd go to YouTube and find tons of $%#@).I
> checked uploaded recordings linked to the ambisonic net site: Very cool
> stuff, but not what I need for a particular study.Best regards,Eric
> -- next part --
> An HTML attachment was scrubbed...
> URL: <
> https://mail.music.vt.edu/mailman/private/sursound/attachments/20150606/1d3221e5/attachment.html
> >
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> Sursound mailing list
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>
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Re: [Sursound] Ambisonics recording of LOUD night club or venue?

2015-06-06 Thread Sampo Syreeni

On 2015-06-06, Hugh Pyle wrote:

I have a few loud bands.  How about this one in B-format?  Small venue 
with rowdy people. https://www.youtube.com/watch?v=Bqxd5KnN8ns


+1

Now that I thought about it, a couple of (purely theoretical) words on 
mic care in loud conditions...


Try to keep your soundfield mic away from the near field of small, 
reflex type subs/bass speakers. Especially the traditional, large 
capsule surface area, low noise types like Mark IV/V. That's because 
while they can take huge amounts of radiative flux, they might not be so 
great with the near field where radiatively speaking small speaker have 
to actually move air. Leading to "flapping trousers" an such; flapping 
wind shields and such, with microphones.


If you have to park your mic in the radiative near field, then the 
design should be miniaturized, and shouldn't involve membrane based 
capsules. Despite the fact that that will yield higher inherent noise 
levels. Only designs based around electret capsules and the like will 
withstand the mechanical forces caused by a near field where air is 
actually moving about.


But then you shouldn't park your microphone there to begin with. The 
reactivity of such fields breaks the assumptions of the usual, passive 
ambisonic decoder to begin with. And while in a typical club space the 
field will be rather reactive even at the center of the space, it won't 
have the specific reactivity of any one source's near field; picked up 
from the center, or "the sweet spot", any reactivity rather contributes 
to spaciousness, and can even be actively decoded to greater 
envelopment, using measures such as DirAC.


Thus, stay away from the bass speakers. Try to get as far into the 
radiative far field as the space allows. Then use an old style, high 
phantom voltage fed condenser design, if you can, leading to low noise. 
Those can take the beating, too, while at such a placement offer lower 
inherent self-noise.

--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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