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Topic: Digital reverberation

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Posted by Romy the Cat on 02-05-2008

 el`Ol wrote:
….I loved eastern European recordings because of their far less damped concert halls….

 el`Ol, you are most likely is a German or some kind of central European. If you so like the sound of eastern European under-damped concert halls then you need to vision US and listen the sound of American concert halls. They are dry like hell and virtually revolting. Visiting a few concert halls in differ cities if US I always, prior to the visit, heard the drooling comments about the spectacular acoustics in those concert halls. However, the actual experience the acoustics of a given concert halls I always as surprised how bad it is. Yes, each concert hall has a few very narrow “sweat spots” but even there the most of the American concert halls sound very wrong to my taste. (Sure I was not everywhere). Interesting the listening the live broadcasts from different concert halls it is also very acoustic in there (though with broadcasts there are many other variables involved).

My personal view is that the human factor is screwing up our concert halls – literally the people who do sound in our concert halls are Morons. Those Morons are trying to make the concert halls to sound in the same way how a cheap MP3 electronics sound, making sound of concert halls compressed and none-distinctive. So, it is not the problem with the halls I feel but rather with the cretins who work in the audio industry and who acoustically administer the halls and the recordings that are made in there. After that the musicians juts are trying to inmate what was “preset” and “presold” for them. The barbaric acoustical electricians keep paying their mortgages, the sound in our concert halls got ruined.

Anyhow, to whoever is interested to the subject there is a good book out there: “Concert and Opera Halls: How They Sound” by Leo Beranek .

Rgs,
Romy the Cat

Posted by JJ Triode on 02-05-2008
There was a good article about this very subject in 2004. You have to pay to use the NYT's archives, but one of Michael Green's disciples quoted it on their website, and they didn't get sued for copyright, so I guess it is OK to post it here:

If Music Is the Architect . . .
By EDWARD ROTHSTEIN

Published: May 22, 2004


AFter Charles Garnier designed the Paris Opera in the 1870's, he called acoustics a "bizarre science."

"Nowhere did I find a positive rule to guide me," he wrote. "I must explain that I have adopted no principle, that my plan has been based on no theory, and that I leave success or failure to chance alone." He compared the acoustician to an acrobat "who closes his eyes and clings to the ropes of an ascending balloon."

The science of acoustics has taken flight since then, but not without many a deflated reputation and misguided journey along the way. Over the last 50 years, more computing power has been applied to acoustic data than ever before, but most big halls have turned out to be dry and pale frames for music.

After all, Avery Fisher Hall had been planned as the apotheosis of the new science of acoustics: Leo L. Beranek, its first acoustic designer, was an electrical engineer who studied signal processing and noise dampening. He had surveyed more than 50 concert halls throughout the world. Nonetheless, Fisher Hall, then named Philharmonic Hall, opened in 1962 to widespread unease. Fourteen years later, the inside was destroyed and replaced. But the problems didn't end, and so, after decades of tinkering, Lincoln Center announced this week that sometime after 2009, the hall would be gutted again.

Some of those problems, of course, are particular to Fisher Hall. Against Mr. Beranek's advice, for example, the hall's original volume and shape were altered to allow more seating. The acoustics in the latest version are also not as bad as their reputation: for instance, the hall's renowned glare became far more mellow once its resident orchestra, the New York Philharmonic, shed the brash nerviness it had cultivated in the 1980's.

But Fisher has also faced the problem of any hall that is less than great; it cannot compare to Carnegie Hall or to Symphony Hall in Boston or to the major halls of Vienna or Amsterdam, where every great orchestra has played and the luckiest listeners have sat: halls where sound can seem to have both substance and space, surrounding and, at times, caressing the listener. As Mr. Beranek himself wrote, "The old halls that are still standing are among the best that were built." That is why they are still standing.

The missteps in Fisher Hall, however, may also reflect a deeper confusion about the nature of concert halls and the role acoustics plays within them. This is an artistic issue, not a scientific one. For a great hall not only determines how music is heard, but also helps determine what music is written. Halls don't just present culture, they shape it.

As Michael Forsyth shows in his 1985 history of concert halls, "Buildings for Music: The Architect, the Musician and the Listener from the 17th Century to the Present Day" (M.I.T. Press), each style of music is associated with a style of space. Gregorian chant, with its measured pace and contrapuntal simplicity, seems inseparable from reverberant cathedrals and stone walls. The same spaces would muddle the harmonic transformations and abrupt motives of a Beethoven piano sonata. The gestural elegance of music for the Baroque court would be immediately lost in an outdoor amphitheater. Some of the gracious, expansive charm of Handel's organ concertos may derive from his awareness that they were being performed in the Rotunda of the Ranelagh Garden in London, where the listening public would promenade.

So, too, with the concert hall. It is no accident that its main repertory remains music that was specifically written to be played in such halls: symphonies, concertos, overtures; or that the music written during the 19th century, when concert halls moved to the center of musical life, remained the music at the center of concert hall life. The building is inseparable from its origins and from the music it inspired. Other musics visit the concert hall; they are not at home in it.

The building defines the nature of the listening public as well. When a concert hall's acoustics fail to welcome listeners into a world of felt sound, when they strip away resonance and emphasize distance and detail, they seem to alter the communal function of the concert hall. They make music seem as if it were something existing "out there," something to be respectfully and carefully heard rather than something intimately and urgently shared.

But that is what tended to happen to concert hall sound during much of the 20th century, and that, too, reflected a changing aesthetic. The music of Modernism demanded a kind of sonic ruthlessness, a crispness and unforgiving clarity. Often, it took a polemical stance toward the mainstream audience as well. How could this not affect the sonic character of halls?

This development also coincided with the beginnings of acoustics as a science. The first acoustical specialist ever to work on a concert hall was Wallace Clement Sabine, a physicist at Harvard University, who discovered important laws governing sonic reverberation and applied them to the design of Symphony Hall in Boston. That hall, which opened in 1900, now bears a plaque calling itself "the first auditorium in the world to be built in known conformity with acoustical laws."

But Symphony Hall was the last great concert hall of the 19th century rather than the first of the 20th. It was unaffected by Modernism. It had a single dedicated function: to serve orchestral sound. Sabine was trying to discover the nature of acoustic success, not reinvent it.

Afterward, as Emily Thompson shows in "The Soundscape of Modernity: Architectural Acoustics and the Culture of Listening in America, 1900-1933" (M.I.T. Press, 2002), acoustics took on a life of its own. The Acoustical Society of America was organized in 1929. Increasingly, electrical tools were used not just in analyzing sound but also in reproducing sound, both in the halls and the home. The sonic frame of reference shifted.

The grand movie palaces of the early decades of the century, for example, were meant to invoke European opera houses and had similar acoustics. (Some even featured orchestras to accompany silent films.) But by the late 1920's, speakers and amplification were essential for the new talkies. When Radio City Music Hall opened in 1932, its acoustics presumed amplification. As the concert hall became more clinical, the theater became more enveloping.

Ms. Thompson also argues that one of the main preoccupations of acousticians of the time was not the presentation of sound, but its prevention: sound control became an industry. The ability to control sound, either through dampening or amplification, also affected the evolution of concert halls. During the 1930's and 40's, Ms. Thompson points out, halls were often built with drastic dampening in the auditorium and increased reverberation on the stage: the hall began to resemble a loudspeaker.

Mr. Beranek described the effect of the Kleinhans Music Hall, built in 1940 in Buffalo, as "rather like listening to a very fine FM stereophonic reproducing system in a carpeted living room." The halls of the late 20th century have often been described as having a hi-fi sound. (In the case of Avery Fisher Hall, hi-fi was even the source of its main donor's fortune).

In addition, the function of the hall itself began to change. Carnegie Hall has always been host to a wide variety of music, but its standard for design and sound was the orchestra. The premise of the late-20th-century hall was that while it created a home for an orchestra, it should be adaptable to all musical styles and functions.

So it has become customary to speak of "tuning a hall." Philharmonic Hall had adjustable panels; so does Avery Fisher. Many new halls go even further, with adjustable hollowed spaces and panels, variously called resonance chambers, clouds, canopies and closets. In some cases (like that of the New York State Theater when it is used by the New York City Opera), there are even electronically controlled sound-shaping speakers. Given psychoacoustical research into sound perception, and given the way ears are now accustomed to artificially hyped home theaters and electronically processed sound, who knows what temptations lie ahead?

This means that the hall is no longer a force that inspires particular styles of music and forms particular communities. It is instead meant to give way before their varied demands. It serves; it does not shape. So the hall has less of a focus. Instead of serving one ideal well, the ideal embodied in a 19th-century orchestral hall, it serves all ideals with compromise.

Is it possible that this makes it more difficult to love a new hall deeply, let alone to love deeply its sound? This may be why some of the most affecting musical spaces of the last decade have not been the large halls, but the smaller ones, built for specific purposes.

Perhaps the next Avery Fisher Hall will break with this tradition, and new forms of culture will emerge. But the risk is that it will be something of a hybrid: a throwback to the 19th century in its presence and ostensible function, a representative of the 20th in its requirements for clarity and demotic variability, and a harbinger of the 21st in that it will be so malleable that it will hardly matter when it finally gives way before yet another incarnation.

Posted by Romy the Cat on 02-05-2008
I really do not know why there is so mach publicity and so much noise around Boston Symphony Hall as some kind of acoustic wonder of the world. I am unfortunately frequently in the Boston Symphony Hall and I do not like the sound of this Hall. It is true that it is much better than other American concert hall; but itself it is very far from what I think it should be. Perhaps the Boston Symphony Hall had better sound in past and then was destroyed during the renovations (as many other Concert Halls were) but I arrived in Boston in 1996 and it was not good alredy. Back in the city of my birth we had Odessa Opera House and as I remember it had acoustic properties that Boston Symphony Hall can not even dream about. It was very “live” and it has that acoustic effect of “mount vision” when you at high altitude can see 20 miles away and feel that it is I right next to you. It was a wonderful sounding Hall…

Odessa_Opera.jpg


Posted by Paul S on 02-05-2008
I'm sure lots of us would be happy to trade halls with someone else, and I'll bet some us would swap without having heard what we're swapping for.  I know I would, because I know the odds would be in my favor.

The "funny" thing these days is that even large endowments and new halls designed by "leading acoustical engineers" don't seem to be helping with bad sound, let alone poor playing of stupid programs, because the people who could possibly make it better either don't know any better, or they don't really think about it rigorously.  Probably analagous to building a hi-fi, actually...

IMO, one of the worst things to happen in my lifetime is "sound reinforcement", with speakers "strategically" placed around the hall.  I think that typically this is part of the "Total Control Strategy", where the hall itself is made about as dead as they can get it and then they put a "sound engineer" in charge of creating what he thinks we should hear.  Well, I have NEVER heard this done well and I have NEVER heard a concert that used these sound better than the natural acoustics of a good hall, or even a mediocre hall, for that matter, given an equal calibre of play.

Of course, the conductor figures in, too, or rather he should.  And wouldn't it be nice if he did...

In fairness, I have heard a couple of "new" concert halls that are not that terrible, and these are by and large the ones that people regard as "good" today.

I used to love going to the old Hollywood Bowl and Greek Theater, OUTDOOR venues that IMO blew the doors off most of what I hear indoors or out these days.

Best regards,
Paul S

Posted by el`Ol on 02-05-2008
Strangely something similar happened in digital reverbs. The first really sophisticated reverb (in 1983) was the Quantec QRS which was some kind of acoustic raytracer (no single microprocessor is powerful enough to emulate it so far) and so profited in centuries-old experience in designing concert halls and other rooms. Not much later came the Lexicon, which was entirely based on psychoacoustic research. An it finally prevailed, although it wasn´t much cheaper. Today it is even used in classical productions to get more life in recordings of these dead concert halls.

Posted by Romy the Cat on 02-05-2008

Interesting, el`Ol, I never know or even thought about it, it makes sense however.

Sometime when I have time and mood I will tell a story how I created acoustic environments that I needed with RT-60 injection using active delayed and phase randomized channels.  I used very interesting and very old ADC processors from 1970-80…

I do not see people talk about those RT-60 injection techniques but the result I was getting were absolutely phenomenal. It was very-very complex in calibration and use though… I still have all those processors in storage and skills to set it the RT-60 injection properly. Sometimes in futures, for a lot of money :-) or for a lot of ego (which is more likely) I would again show off how it might be done

The caT

Posted by el`Ol on 03-03-2008
 el`Ol wrote:
The first really sophisticated reverb (in 1983) was the Quantec QRS which was some kind of acoustic raytracer (no single microprocessor is powerful enough to emulate it so far) and so profited in centuries-old experience in designing concert halls and other rooms.


Correction:
Since last year the top-of-the line Quantecs have the full functionality of the original QRS, including variation of room size.

Posted by Romy the Cat on 10-31-2008
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As I said I am not a huge admirer of Boston Symphony Hall. However, here is a good observation by WGBH’s Brian Bell about our prime Concert Hall. Some aspects of acoustics in there are deceased. It is 12Meg file of MP3

http://www.mediafire.com/?0guu2aac9qt

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