Jonathan Burton wrote:
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.
Really?
How can this be if there are no fundamentals in this range? (See my list
of piano keys/frequencies. Some instruments go down to about 30Hz.
Organs can go even lower, but this is already one of the non-typical
cases....)
Lower frequencies could be the consequence of interference/combination
tones.
http://en.wikipedia.org/wiki/Combination_tone
I doubt that these effects will be that big. Percussion could be another
exceptional case. So, do we have significant LF noise in some percussion
spectra? Do other instrument spectra contain some LF noise?
I am really interested to learn about if we can measure these
frequencies in music and recordings, but I am not exactly convinced yet...
Best,
Stefan
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 <rica...@justnet.com.au> 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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