Loudspeaker perception

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Helmut, I'm just evaluating the relevance of WFS by looking what the requirements for recording, mixing and playback would be. When we just end up in simulating a dedicated number of virtual speakers in a virtual room then I don't see any arguments to change from stereophony to WFS. Did I miss something?

Best, Markus
 
gedlee said:


But I think that a lot of the rest of us do. To me, what you "don't care about" is really "what its all about".


Hello, that was not meant as any offense at all. Hundred people = hundred opinions / approaches to music. I have respect for people trying to find out, what is it all about. I just (being an MSc. in power electronics) tend to approach music from the emotional instead of technical view. As long as the music is playing, I am happy, be it a boombox or hi-end system. I like to be surrounded by music and I have tried a way, that gives me better results than ordinary stereo pair. Be it natural / hi-fi or not. I mostly listen to pan-potted stereo with artficial reverb - and there is really no "natural" way of listening to it. And it is more or less the same at live concerts with a PA.
I will end posting into this thread, as I have said already what I needed to say (and not even a minimal offense taken - I would be more off topic than anything else).
 
Originally posted by markus76 Helmut, I'm just evaluating the relevance of WFS by looking what the requirements for recording, mixing and playback would be. When we just end up in simulating a dedicated number of virtual speakers in a virtual room then I don't see any arguments to change from stereophony to WFS. Did I miss something? Best, Markus

Marcus,
As you mentioned above the recording process becomes reduced upon the dry recording of each single source, probably spatial closed small groups of sound sources. The advantage of the wfs in compartion with other 3D approaches as dummy head recordings or in certain degree ambisonisc is, the signal remains completely manipulable, you can compress, equalize or change the position nearly at will. Yet on the playback side you can change your virtually listening position inside the recording room with your remote, if you want by my proposal. Besides real 3D, the elevation of the mirror source position is substantionally in my view.

I see it alike you, wfs speakers only for the reproduction of conventionally recorded material wouldn’t justify the effort. Though, the possibility for changing the playback room acoustics in the early reflection range, adapted regarding the signal content would be a significantly advantage already. To fake a acoustic behavior by reverberation, as done in many gadgets, fails the goal.

Best, H.
www.holophony.net
 
pelanj said:
I must say I do not really care about any scientific/non scientific explanations, imaging sharpness, real space feeling , neither do I know what is really going on, the ceiling reflected sound gives me music with some kind of spaciousness and the most uniform sound cover of the room without significantly degrading sound balance, the speakers just disappeared acoustically - and that was my goal - a pretty good result with a pair of lousy speakers with limited space and volume. A multiway horn stack can do it much better in a good room (I've heard that) - that is out of my reach right now mainly due to space constraints.


Pelanj, no bad choice you made.
Had a pair of these


http://www.carlssonplanet.com/v1.php

once and the impression of "spaciousness" was very similar to what you describe and seem to like.
When I first heard them I was smashed by the airy presentation throughout the room and I imediately bought them.

Were a simple whizzercone fullrange in a vented box firing upwards - very minimalistic concept - not that detailled for nowadays standards but absolutely great overall "sound-carpet" you could virtually swim in (dont agree with the review from the link at all).

Greetings
Michael
 
mige0 said:

http://www.carlssonplanet.com/v1.php

Were a simple whizzercone fullrange in a vented box firing upwards - very minimalistic concept - not that detailled for nowadays standards but absolutely great overall "sound-carpet" you could virtually swim in (dont agree with the review from the link at all).

thanks for the link Michael! 🙂
I didn't know this particular Sonab speaker which actually reminds my own CFS very much, see: http://www.diyaudio.com/forums/showthread.php?s=&threadid=121385

see picture attached to post No 4
I have proposed a new method of placement of such speakers, inspired by Harold Beveridge placement directives for His line source ESL's, see post No1 in the linked thread

best regards!
graaf
 
pelanj said:
I just (being an MSc. in power electronics) tend to approach music from the emotional instead of technical view.


Music is the emotional side of the situation and rightly so. But reproduction is a science and its important not to mix these two things up. I am pasionate about music, emotional too, but reproducing music is a purely objective problem of right and wrong. There should not be any emotion involved.
 
Rudolf said:

So I finally tried it myself. I put two small fullrange boxes along the wall - back to back and at ear height. Symmetry along that wall (and around the corners) is almost perfect. What did I hear:
A center "image" that for the most part compressed the central 45° of my normal listening "window" into a ~10° wide spot. Everything outside seemed stretched between the inner circle and the corners. Anything with very high frequency content would have a phantom image right in the corners.
While sounds emanating left from the middle still could be localized on the left side, precision of imaging was a far cry from what I am used to.

SLS is very recording-type dependent
were those effects of "image stretching", "corner location" etc. consistent with every recording You have used?
I can confirm that such effects can happen with some recordings but only with some
on the other hand from my experience I have to say that these are not just room interaction effects - "artificial soundstage created by room reflections" - because many times with closely-miked recordings without reverb I have observed complete lack of soundstage with SLS
reflections were there - without doubt - yet I have observed NO artificial "listening room dependent soundstage"
from that follows that SLS is not creating false uniform soundstage relying on interaction with listening room acoustics

rather room acoustics just amplify spatial cues present in the recording
when they are absent no soundstage is "created"
this is high fidelity , no tricks

Rudolf said:

But in the end I would prefer omnis for that kind of experience. At least they improved in imaging when I moved near to their baseline.

well, problems with recordings’ compatibility caused me in the end to move my interest to Carlsson-like omnis in Beveridge-like setup described in the "Loudspeaker and room" thread
this is something I would advocate now - not Stereolith which is certainly "not for everyone" still there is something in this Stereolith thing which works and when it works it is great, realism far beyond conventional stereo
something showing that not everything is well understood yet in the field
and I would say that all classical music lovers really SHOULD check it up!
from my experience I can tell that most classical recordings seem to compatible with SLS

best regards!
graaf
 
Russell Dawkins said:
In my experience, one box stereo systems can be marvelous, but are limited to listening somewhere down the central axis only. For me this is an unacceptable compromise.

yes, they can be marvelous
SLS is not limited to listening somewhere down the central axis only, at least not in my experience
it is however very recording-type dependent

best regards!
graaf
 
syntheticwave said:

By certain circumstances the best adaptation would be graafs super speaker, which would fail completely when a dry recorded sound field must become restored. In such case a strongly directed radiation would deliver the best results. We would need a variable and steerable directive effect.

yes, indeed
Stereolith and SLS can be genuine "super speakers" with compatible recordings in optimal setup and on the other hand fail miserably with incompatible recordings

syntheticwave said:

...but your ceiling fires back on the same time, regardless the recording room was 3 or 13 meters in high

problem of ceiling reflection can be eliminated or at least sufficiently diminished
I mean line sources and my own proposition
see post No 1: http://www.diyaudio.com/forums/showthread.php?s=&threadid=121385

I also think that in SLS the speakers themselves are not perceived as physical sound source therefore vertical reflection of their output off the ceiling and off the floor in the median plane is completely unproblematic

besides I also think that ceiling reflection is the least important reflection of all
what psychoacoustic information is carried by reflections coming from above?
I believe that no really important

moreover I believe that smaller acoustics cannot "cover" bigger acoustics
I buy David Moulton's argument - reflections in room carry information about reflections of bigger recording venue provided that such information is present in the recording

best regards!
graaf
 
pelanj said:
So today I have set up my amp and lousy bookshelf speakers in my living room - and I moved the loudspeakers and listened to music a lot🙂

2. I liked speakers at ear height firing up to to the cellar - I love that spaciousness be it HiFi or not.

well, HiFi, high fidelity to what?
interesting question for another discussion 🙂

pelanj said:

6. SLS and CFS both preserved positions (albeit imaging is not pinpoint sharp) of the instruments/singer while walking around the room - IMHO the greatest advantage to standard stereo setup.

yes - very wide "sweet spot" 😀
and there IS stable imaging, not pinpoint sharp but natural
sound sources occupy acoustical space and are surrounded by acoustical space, soundstage represents a kind of stable continuum
natural sound localization is never pinpoint sharp in the fashion of conventional stereo
"pinpoint imaging" is artificial, unnatural, simply not HiFi (if we assume that "fidelity" in HiFi refers to acoustical "reality" ie. live sound)

pelanj said:

7. Ceiling firing setup is the winner for me

and for me, at least for the time being 😉

best regards!
graaf
 
markus76 said:

To music for sure but sound reproduction is just a technical process. No magic behind it, just pure science at best. A lot of audiophiles tend to forget/ignore that.

yes indeed
as You probably know I am very interested in science
http://www.diyaudio.com/forums/showthread.php?s=&threadid=105136

but well - where is The Science?

we are exploring Mars and we have Large Hadron Collider but what is The Science behind spatial reproduction of sound?

Ben Bauer from 60-ties?
Alan Blumlein from 40-ties?

markus76 said:
We're all speculating to a certain extend. There simply is no real world data from that working recommendations for recording/mixing and speaker/room could derive.

:xeye: 🙁

so where is The Science?

best regards!
graaf
 
graaf said:

so where is The Science?

graaf,
science is
- not hopping on every flashy new train that passes by.
- not relying on your emotions more than physical evidence.
- not trying to convince everyone by words more than by provable facts.

If I would have known that you already have given up on SLS I might have spent my time with nicer things than follow your recommendation to try SLS myself.

If I would have known that SLS is not compatible with my set of 5 CDs that span every aspect of musical style and reproduction that I am interested in, I could have had a nicer couple of listening hours with my proven system which is not at all picky with "closely-miked recordings without reverb".

If I would have known that you are not really interested in other peoples experiences but in the defense of your preconceived opinions, I could have .....

Ahh, what do I talk?
 
mige0 said:

Pelanj, no bad choice you made.
Had a pair of these

http://www.carlssonplanet.com/v1.php

once and the impression of "spaciousness" was very similar to what you describe and seem to like.

I browsed through the Carlsson pages some days ago and found these very inspiring!

gedlee said:

Music is the emotional side of the situation and rightly so. But reproduction is a science and its important not to mix these two things up. I am pasionate about music, emotional too, but reproducing music is a purely objective problem of right and wrong. There should not be any emotion involved.

Please do not get me wrong - I agree with what you say, but I do not have sufficient knowledge of acoustics / psychoacoustics, so I have found this speaker setup by experimenting after another people's advice. And as long as it works for me, I do not care about the science behind and why it works. I leave this on you and others. I just enjoy music and therefore the work of lots of people behind. I know this is a scientific thread - and I should have posted elsewhere (and I did post the same into the Stereolith thread). I was interested in what Markus can hear with SLS and I promised to share my personal experience as well. So there it was 😀

Anyway, this forum has a few very helpful and educated members - and that is good for all of us. I've learned a lot and still learning😉
 
Rudolf said:

If I would have known that you already have given up on SLS I might have spent my time with nicer things than follow your recommendation to try SLS myself.

If I would have known that SLS is not compatible with my set of 5 CDs that span every aspect of musical style and reproduction that I am interested in, I could have had a nicer couple of listening hours with my proven system which is not at all picky with "closely-miked recordings without reverb".

Rudolf, Rudolf...

You could have known
I wrote about it many times, for example:

http://www.diyaudio.com/forums/showthread.php?s=&postid=1619682&highlight=#post1619682

I turn to CFS because SLS fails miserably with incompatible recordings


Rudolf said:

If I would have known that you are not really interested in other peoples experiences but in the defense of your preconceived opinions, I could have .....

You know so well what I am really interested in...
without even reading carefully what I write here...
 
markus76 said:


To music for sure but sound reproduction is just a technical process. No magic behind it, just pure science at best. A lot of audiophiles tend to forget/ignore that.



It is true that the more basal parts of the brain show less interindividual differences, but the processed information they deliver have to be interpreted by the forebrain. I don´t know whether you have followed the discussion about overtone hearers and fundamental hearers in Germany. It clearly shows that the "higher" parts of the brain can set individual preferences for the information the "lower" parts deliver. And I am quite sure there are similar phenomenons in spacial hearing that haven´t been explored yet.
 
Oliver, of course there's a lot we don't know or even understand but stereophony or multichannel is only a technical process when it comes to recording, mixing and playback. I strongly believe that we can measure the relevant parameters. Maybe we just haven't found the right rating system. Blesser/Salter proposed a hierarchy in hearing that I find very useful for further discussion:
- sensation
- perception
- meaning

By the way two very good books that I'm currently reading:
"Spaces Speak, Are You Listening?: Experiencing Aural Architecture", Blesser/Salter
"Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms", Toole

Best, Markus
 
Hello,

gedlee said:
When it comes to the psychoacoustics stuff this is quite true. There is lots of data to be sure, but it can be very difficult to appliy it to a design issue. The LF directivity issue where this all started is a perfect example. One has to blend what we know from experince, what we know from the research and what is paractical to design and build. Its a crap shoot, a lot of guess work and some technical salvy, but hardly cookbook.

Have you actually done any research yourself with high directive speakers like dipole line arrays or second order cardioids and their behaviour in small rooms for stereo imaging at low freqs (200Hz-1kHz)?

- Elias
 
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