true omni seems to makes sense only in very large rooms
which is why a 180degree 'half-omni' is suggested
which is why a 180degree 'half-omni' is suggested
Markus,
plausible rendition of what?
You also have to ask in what environment or home/listening room size, listening to what type of material at what SPL's. Since 2 channel Stereo is in imperfect listening medium it is inevitable to come up with different answers, maybe many of the answers can be right in some circumstances.
In terms of physical/human interaction I find omni directional the most natural presentation, the least mechanical or machine like dispersion. However they are no good for people who want sharp stereo imaging sitting at the far end of their lounge.
plenty of ways to go but if you want a good measure of this presentation with less room interaction have a larger room to enjoy the benefits of open baffle bass go dipole cone or ESL.
Big room, farfield or long listening distance (for a normal home) big pulverising sound with thrilling unbridled dynamics, high clarity even at massive spl's, high power handling then you might want high directivity from large drive units and large waveguides.
Actually very few people (and notably their wives) will be able to accommodate such designs, still it doesn't stop this being ideal for some tastes.
plausible rendition of what?
You also have to ask in what environment or home/listening room size, listening to what type of material at what SPL's. Since 2 channel Stereo is in imperfect listening medium it is inevitable to come up with different answers, maybe many of the answers can be right in some circumstances.
In terms of physical/human interaction I find omni directional the most natural presentation, the least mechanical or machine like dispersion. However they are no good for people who want sharp stereo imaging sitting at the far end of their lounge.
plenty of ways to go but if you want a good measure of this presentation with less room interaction have a larger room to enjoy the benefits of open baffle bass go dipole cone or ESL.
Big room, farfield or long listening distance (for a normal home) big pulverising sound with thrilling unbridled dynamics, high clarity even at massive spl's, high power handling then you might want high directivity from large drive units and large waveguides.
Actually very few people (and notably their wives) will be able to accommodate such designs, still it doesn't stop this being ideal for some tastes.
Could be an interesting new thread: Brainstorming on how to build a 180° constant directivity speaker.
Plausible rendition of a real sound source.
In everyday live, pin point localization is the exception not the norm. Don't get me wrong, pin point localization is a main feature in most recorded music. It's a cultural phenomenon just like concert halls and symphonic orchestras or churches and pipe organs.
But here I'm interested in how the sound field and the corresponding recorded signal has to look like in order to create a auditory event that could exist in the real world. And I'm interested if the results can be generalized.
I agree, nonetheless I like the effect. The speakers auditory scene becomes more realistic as you move away from the speakers, I like this too.
I think Pluto as an omni like/omni light? presents a convincing soundfield even better than dipole radiators. However this isn't the only consideration with such an imperfect medium and so many engineering compromises to juggle. When I listen to Classical or any acoustic recordings I find dipoles and omni's the most convincingly natural transducers, however on paper they are probably not the most accurate window on a recording, (if that is all you are after then you want the direct injected presentation of headphones) but since stereo is an effect in the 1st place..........
In practice (in terms of clarity) Pluto is at least equally revealing (and mostly far better)compared to any other speakers I have owned or listened to, reflections or no they are highly revealing of production quality compared to countless high quality home hi-fi speakers in all shapes and sizes (box or otherwise), Studio monitors and ESL's.
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It exhibits uniform radiation to 90 degrees (and beyond) on the horizontal as well as the vertical plane. Maybe the correct terminology is Very Wide Dispersion?
I expect the high frequency to be compromised in the back. At what frequency exactly? I'm not sure, I didn't measure that yet. In my design I did not consider the backwave to be of great importance. My reasoning was that the cabinet will act as an obstacle behind the source much like a musician leaning against a pillar. One should not hear a difference whether there is a pillar or no pillar.
I see that you disagree about the importance of the backwave reflection and that is a valid criticism. Maybe we can run some tests to determine how much it matters.
Guys,
Have you all had a look at this?
http://www.acourate.com/freedownload/Horbach_Keele_Dipole_Prototype.pdf.
IMHO a credible attempt to create a real omni a la the Don Keele recipe.
Cheers,
Eelco
Have you all had a look at this?
http://www.acourate.com/freedownload/Horbach_Keele_Dipole_Prototype.pdf.
IMHO a credible attempt to create a real omni a la the Don Keele recipe.
Cheers,
Eelco
in fact such a true idealised omni is definitely NOT what we need for high fidelity sound reproduction at home as it would make much harder to get rid of detrimental effects of of floor and ceiling reflections
same issues as with dipoles
thats where the floor(flooder?) makes its entrence
for whatever reason its seems able to deal with surroundings
that was swedish Carlsons aim too
if can't beat them, join them...so to speak
question is how much omni is needed, because too much omni seem to be a problem as well
yes, this is good question
so CD speakers set up in Dr Geddes' way do not offer the last word in realistic sound reproduction? 😉
oh yeah, I see! You mean true omni 360 degrees, I would then say more - it makes sense only in an anechoic chamber which means it doesn't make any sense at all...