Re: [Sursound] Infra sound & Sub bass.

[Jonathan Burton]

I think my use of the word significant was unwise but I would be interested
to hear from anyone else who has looked in the lower spectrum below 30 Hz
and found content. In measurements I made, just looking at a
local orchestra, there was energy going down below 20hz  The heating system
was clearly registered at a steady 16hz but this noise was dynamic and
matching that of the instruments. This was popular symphonic
music, modern dance music as you surmised features much higher levels.
Regards
Jon

On Friday, April 24, 2015, Elizabeth Durand & Bill Houston <
bille...@cavtel.net> wrote:

>
> I too doubt that most music has sub 20hz  material except for some organ
> and percussion, electronic music and other recordings utilizing
> sub-harmonic synthesizers. Another obvious source of sub 20hz sound is
> unwanted environmental noise such as HVAC, traffic etc.
>
> Bill Houston
> Sent from my iPhone
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Re: [Sursound] ENVELOP - 3D Sound, on Kickstarter.com - SUB frequency range

[Jonathan Burton]

My interest is as yours musical. Spectragraphs of frequency show
significant energy at 20Hz and below in most forms of music. As soon as
Percussion is introduced the level becomes significant.
Mono reproduction of sub has many practical benefits in that it reduces the
amount of phase cancellation that occurs with multiple speakers which in my
profession is a major concern.
It would be great to work with more surround sound/ambisonic material but
with large audience this becomes impractical.
Thanks for the reply though.
Jon

On Thursday, April 23, 2015, Richard Lee  wrote:

> There is an important reason to maintain full Ambisonic capability to below
> 20Hz.
>
> It is a MUSICAL one.
>
> Go to a service at a large cathedral with good organ.  At the end of the
> service, the organist will play something to show off while everyone is
> leaving.  You can walk around and listen at various positions without
> causing offense.
>
> On SOME pedal notes at SOME positions, you will experience 'pressure in the
> head' sensations .. on other notes and positions the experience is 'trouser
> flapping'   Pressure & Velocity nodes in cathedral space
>
> A mono recording or single "high quality Sub" converts the pleasant
> 'trouser flapping' to unpleasant 'pressure in the head'.
>
> You need at least stereo, preferably at least 4 subs in a classic Ambi
> system (and a TetraMic recording) to reproduce these important aspects of
> an organ performance.  This isn't about LF 'localisation'.  It's about
> pleasant musical sounds.
>
> If the desired effect is Bruce Willis blowing up the universe, dinosaur
> footsteps or modern music (??), your single "high quality Sub" is
> sufficient.  You can also achieve the same effect by having someone stand
> behind you wielding a blunt instrument at the appropriate moment.
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Re: [Sursound] Infra sound & Sub bass.

[Jonathan Burton]

On Wednesday, April 22, 2015, Peter Lennox  wrote:

> I'd be interested in any references indicating deleterious effects on
> hearing of high amplitudes at LF, if anyone comes across any
> cheers
> ppl
> Dr. Peter Lennox
> Senior Fellow of the Higher Education Academy
> Senior Lecturer in Perception
> College of Arts
> University of Derby
>
> Tel: 01332 593155
> 
> From: Sursound [sursound-boun...@music.vt.edu ] On Behalf
> Of Jörn Nettingsmeier [netti...@stackingdwarves.net ]
> Sent: 22 April 2015 19:20
> To: sursound@music.vt.edu 
> Subject: Re: [Sursound] Infra sound & Sub bass.
>
> On 04/22/2015 06:49 PM, jon burton wrote:
> > Hi I am new to the group but hoping  someone may be able to help. I
> > am looking at the positive effects of low frequencies in music,
> > predominantly below 50Hz. This involves aural as well as
> > mechanosensations. I am interested in seeing if reinforcing the low
> > frequency content below 50Hz can help produce a more immersive
> > listening experience at lower overall sound pressure levels
> > (particularly when measured using the A weighting scale). Trouser
> > flapping bass! I am struggling to find papers on the subject. Any
> > suggestions are welcome!
>
> Well, it's not a secret that most live sound engineers, when faced with
> a 99dB(A) rule, will mix into the A curve, i.e. crank up the bass a lot.
> So there is plenty anecdotal evidence for more bass resulting in less
> weighted sound pressure. For more perceived loudness, mixing in some
> typical loudspeaker-like artificial distortion has prevented me from
> getting beaten up at a "95 at the mixer" open air metal concert. Don't
> ask me who came up with that rule, for that kind of music.
>
> But I've heard medical research hint at low frequency exposure having a
> very damaging effect across the entire hearing spectrum, which means
> that we are mixing around the rules but are actually endangering our
> audiences.
> Be sure to check the literature for this problem, to get a balanced view.
>
> --
> Jörn Nettingsmeier
> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>
> Meister für Veranstaltungstechnik (Bühne/Studio)
> Tonmeister VDT
>
> http://stackingdwarves.net
>
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